Mock Version: 2.9
ENTER ['do_with_status'](['bash', '--login', '-c', '/usr/bin/rpmbuild -bs --target x86_64 --nodeps /builddir/build/SPECS/lifeograph.spec'], chrootPath='/var/lib/mock/fedora-rawhide-x86_64/root'env={'TERM': 'vt100', 'SHELL': '/bin/bash', 'HOME': '/builddir', 'HOSTNAME': 'mock', 'PATH': '/usr/bin:/bin:/usr/sbin:/sbin', 'PROMPT_COMMAND': 'printf "\\033]0;<mock-chroot>\\007"', 'PS1': '<mock-chroot> \\s-\\v\\$ ', 'LANG': 'C.UTF-8'}shell=Falselogger=<mockbuild.trace_decorator.getLog object at 0x7f43ba521e20>timeout=0uid=1000gid=135user='mockbuild'nspawn_args=[]unshare_net=TrueprintOutput=True)
Executing command: ['bash', '--login', '-c', '/usr/bin/rpmbuild -bs --target x86_64 --nodeps /builddir/build/SPECS/lifeograph.spec'] with env {'TERM': 'vt100', 'SHELL': '/bin/bash', 'HOME': '/builddir', 'HOSTNAME': 'mock', 'PATH': '/usr/bin:/bin:/usr/sbin:/sbin', 'PROMPT_COMMAND': 'printf "\\033]0;<mock-chroot>\\007"', 'PS1': '<mock-chroot> \\s-\\v\\$ ', 'LANG': 'C.UTF-8'} and shell False
warning: Macro expanded in comment on line 11: %{name}-0.11.1-desktop-file.patch
Building target platforms: x86_64
Building for target x86_64
setting SOURCE_DATE_EPOCH=1616889600
Wrote: /builddir/build/SRPMS/lifeograph-2.0.0-1.fc35.src.rpm
Child return code was: 0
ENTER ['do_with_status'](['bash', '--login', '-c', '/usr/bin/rpmbuild -bb --target x86_64 --nodeps /builddir/build/SPECS/lifeograph.spec'], chrootPath='/var/lib/mock/fedora-rawhide-x86_64/root'env={'TERM': 'vt100', 'SHELL': '/bin/bash', 'HOME': '/builddir', 'HOSTNAME': 'mock', 'PATH': '/usr/bin:/bin:/usr/sbin:/sbin', 'PROMPT_COMMAND': 'printf "\\033]0;<mock-chroot>\\007"', 'PS1': '<mock-chroot> \\s-\\v\\$ ', 'LANG': 'C.UTF-8'}shell=Falselogger=<mockbuild.trace_decorator.getLog object at 0x7f43ba521e20>timeout=0uid=1000gid=135user='mockbuild'nspawn_args=[]unshare_net=TrueprintOutput=True)
Executing command: ['bash', '--login', '-c', '/usr/bin/rpmbuild -bb --target x86_64 --nodeps /builddir/build/SPECS/lifeograph.spec'] with env {'TERM': 'vt100', 'SHELL': '/bin/bash', 'HOME': '/builddir', 'HOSTNAME': 'mock', 'PATH': '/usr/bin:/bin:/usr/sbin:/sbin', 'PROMPT_COMMAND': 'printf "\\033]0;<mock-chroot>\\007"', 'PS1': '<mock-chroot> \\s-\\v\\$ ', 'LANG': 'C.UTF-8'} and shell False
warning: Macro expanded in comment on line 11: %{name}-0.11.1-desktop-file.patch
Building target platforms: x86_64
Building for target x86_64
setting SOURCE_DATE_EPOCH=1616889600
Executing(%prep): /bin/sh -e /var/tmp/rpm-tmp.W31H2U
+ umask 022
+ cd /builddir/build/BUILD
+ cd /builddir/build/BUILD
+ rm -rf lifeograph-2.0.0
+ /usr/bin/xz -dc /builddir/build/SOURCES/lifeograph-2.0.0.tar.xz
+ /usr/bin/tar -xof -
+ STATUS=0
+ '[' 0 -ne 0 ']'
+ cd lifeograph-2.0.0
+ /usr/bin/chmod -Rf a+rX,u+w,g-w,o-w .
+ sed -i 's|<build_time.h>|"build_time.h"|' src/lifeograph.cpp
+ RPM_EC=0
++ jobs -p
+ exit 0
Executing(%build): /bin/sh -e /var/tmp/rpm-tmp.2VZL9o
+ umask 022
+ cd /builddir/build/BUILD
+ cd lifeograph-2.0.0
+ ./create_time_build_time_header.sh lifeograph ./src/ ./src/
+ find . -name build_time.h -print
./src/build_time.h
+ CFLAGS='-O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1  -m64  -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection'
+ export CFLAGS
+ CXXFLAGS='-O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1  -m64  -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection'
+ export CXXFLAGS
+ FFLAGS='-O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1  -m64  -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -I/usr/lib64/gfortran/modules'
+ export FFLAGS
+ FCFLAGS='-O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1  -m64  -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -I/usr/lib64/gfortran/modules'
+ export FCFLAGS
+ LDFLAGS='-Wl,-z,relro -Wl,--as-needed  -Wl,-z,now -specs=/usr/lib/rpm/redhat/redhat-hardened-ld '
+ export LDFLAGS
+ LT_SYS_LIBRARY_PATH=/usr/lib64:
+ export LT_SYS_LIBRARY_PATH
+ CC=gcc
+ export CC
+ CXX=g++
+ export CXX
+ /usr/bin/meson --buildtype=plain --prefix=/usr --libdir=/usr/lib64 --libexecdir=/usr/libexec --bindir=/usr/bin --sbindir=/usr/sbin --includedir=/usr/include --datadir=/usr/share --mandir=/usr/share/man --infodir=/usr/share/info --localedir=/usr/share/locale --sysconfdir=/etc --localstatedir=/var --sharedstatedir=/var/lib --wrap-mode=nodownload --auto-features=enabled . x86_64-redhat-linux-gnu
The Meson build system
Version: 0.57.1
Source dir: /builddir/build/BUILD/lifeograph-2.0.0
Build dir: /builddir/build/BUILD/lifeograph-2.0.0/x86_64-redhat-linux-gnu
Build type: native build
Project name: net.sourceforge.Lifeograph
Project version: 2.0.0
C++ compiler for the host machine: g++ (gcc 11.0.1 "g++ (GCC) 11.0.1 20210324 (Red Hat 11.0.1-0)")
C++ linker for the host machine: g++ ld.bfd 2.36.1-8
Host machine cpu family: x86_64
Host machine cpu: x86_64
Found pkg-config: /usr/bin/pkg-config (1.7.3)
Run-time dependency gtkmm-3.0 found: YES 3.24.4
Run-time dependency enchant-2 found: YES 2.2.15
Run-time dependency champlain-gtk-0.12 found: YES 0.12.20
Run-time dependency libgcrypt found: YES 1.9.2-unknown
Run-time dependency threads found: YES
Configuring config.h using configuration
Program meson_post_install.py found: YES (/usr/bin/python3 /builddir/build/BUILD/lifeograph-2.0.0/meson_post_install.py)
Build targets in project: 7
Found ninja-1.10.2 at /usr/bin/ninja
+ /usr/bin/meson compile -C x86_64-redhat-linux-gnu -j 8 --verbose
ninja: Entering directory `x86_64-redhat-linux-gnu'
[1/42] /usr/bin/meson --internal msgfmthelper ../net.sourceforge.Lifeograph.desktop.in net.sourceforge.Lifeograph.desktop desktop ../po
[2/42] /usr/bin/meson --internal msgfmthelper ../x-lifeographdiary.xml.in x-lifeographdiary.xml xml ../po --datadirs=/builddir/build/BUILD/lifeograph-2.0.0/po/gettext
[3/42] /usr/bin/meson --internal msgfmthelper ../net.sourceforge.Lifeograph.metainfo.xml.in net.sourceforge.Lifeograph.metainfo.xml xml ../po
[4/42] g++ -Ilifeograph.p -I. -I.. -I/usr/include/gtkmm-3.0 -I/usr/lib64/gtkmm-3.0/include -I/usr/include/giomm-2.4 -I/usr/lib64/giomm-2.4/include -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/sysprof-4 -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/glibmm-2.4 -I/usr/lib64/glibmm-2.4/include -I/usr/include/sigc++-2.0 -I/usr/lib64/sigc++-2.0/include -I/usr/include/gtk-3.0 -I/usr/include/pango-1.0 -I/usr/include/harfbuzz -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/fribidi -I/usr/include/libxml2 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/gio-unix-2.0 -I/usr/include/atk-1.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/dbus-1.0 -I/usr/lib64/dbus-1.0/include -I/usr/include/at-spi-2.0 -I/usr/include/cairomm-1.0 -I/usr/lib64/cairomm-1.0/include -I/usr/include/pangomm-1.4 -I/usr/lib64/pangomm-1.4/include -I/usr/include/atkmm-1.6 -I/usr/lib64/atkmm-1.6/include -I/usr/include/gtk-3.0/unix-print -I/usr/include/gdkmm-3.0 -I/usr/lib64/gdkmm-3.0/include -I/usr/include/enchant-2 -I/usr/include/champlain-0.12 -I/usr/include/clutter-gtk-1.0 -I/usr/include/clutter-1.0 -I/usr/include/cogl -I/usr/include/libdrm -I/usr/include/json-glib-1.0 -I/usr/include/libsoup-2.4 -fdiagnostics-color=always -pipe -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -Wnon-virtual-dtor -std=c++14 -DGETTEXT_PACKAGE=net.sourceforge.Lifeograph -DHAVE_CONFIG_H -O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -pthread -MD -MQ lifeograph.p/src_chapter.cpp.o -MF lifeograph.p/src_chapter.cpp.o.d -o lifeograph.p/src_chapter.cpp.o -c ../src/chapter.cpp
[5/42] g++ -Ilifeograph.p -I. -I.. -I/usr/include/gtkmm-3.0 -I/usr/lib64/gtkmm-3.0/include -I/usr/include/giomm-2.4 -I/usr/lib64/giomm-2.4/include -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/sysprof-4 -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/glibmm-2.4 -I/usr/lib64/glibmm-2.4/include -I/usr/include/sigc++-2.0 -I/usr/lib64/sigc++-2.0/include -I/usr/include/gtk-3.0 -I/usr/include/pango-1.0 -I/usr/include/harfbuzz -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/fribidi -I/usr/include/libxml2 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/gio-unix-2.0 -I/usr/include/atk-1.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/dbus-1.0 -I/usr/lib64/dbus-1.0/include -I/usr/include/at-spi-2.0 -I/usr/include/cairomm-1.0 -I/usr/lib64/cairomm-1.0/include -I/usr/include/pangomm-1.4 -I/usr/lib64/pangomm-1.4/include -I/usr/include/atkmm-1.6 -I/usr/lib64/atkmm-1.6/include -I/usr/include/gtk-3.0/unix-print -I/usr/include/gdkmm-3.0 -I/usr/lib64/gdkmm-3.0/include -I/usr/include/enchant-2 -I/usr/include/champlain-0.12 -I/usr/include/clutter-gtk-1.0 -I/usr/include/clutter-1.0 -I/usr/include/cogl -I/usr/include/libdrm -I/usr/include/json-glib-1.0 -I/usr/include/libsoup-2.4 -fdiagnostics-color=always -pipe -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -Wnon-virtual-dtor -std=c++14 -DGETTEXT_PACKAGE=net.sourceforge.Lifeograph -DHAVE_CONFIG_H -O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -pthread -MD -MQ lifeograph.p/src_dialog_preferences.cpp.o -MF lifeograph.p/src_dialog_preferences.cpp.o.d -o lifeograph.p/src_dialog_preferences.cpp.o -c ../src/dialog_preferences.cpp
[6/42] g++ -Ilifeograph.p -I. -I.. -I/usr/include/gtkmm-3.0 -I/usr/lib64/gtkmm-3.0/include -I/usr/include/giomm-2.4 -I/usr/lib64/giomm-2.4/include -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/sysprof-4 -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/glibmm-2.4 -I/usr/lib64/glibmm-2.4/include -I/usr/include/sigc++-2.0 -I/usr/lib64/sigc++-2.0/include -I/usr/include/gtk-3.0 -I/usr/include/pango-1.0 -I/usr/include/harfbuzz -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/fribidi -I/usr/include/libxml2 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/gio-unix-2.0 -I/usr/include/atk-1.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/dbus-1.0 -I/usr/lib64/dbus-1.0/include -I/usr/include/at-spi-2.0 -I/usr/include/cairomm-1.0 -I/usr/lib64/cairomm-1.0/include -I/usr/include/pangomm-1.4 -I/usr/lib64/pangomm-1.4/include -I/usr/include/atkmm-1.6 -I/usr/lib64/atkmm-1.6/include -I/usr/include/gtk-3.0/unix-print -I/usr/include/gdkmm-3.0 -I/usr/lib64/gdkmm-3.0/include -I/usr/include/enchant-2 -I/usr/include/champlain-0.12 -I/usr/include/clutter-gtk-1.0 -I/usr/include/clutter-1.0 -I/usr/include/cogl -I/usr/include/libdrm -I/usr/include/json-glib-1.0 -I/usr/include/libsoup-2.4 -fdiagnostics-color=always -pipe -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -Wnon-virtual-dtor -std=c++14 -DGETTEXT_PACKAGE=net.sourceforge.Lifeograph -DHAVE_CONFIG_H -O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -pthread -MD -MQ lifeograph.p/src_dialog_password.cpp.o -MF lifeograph.p/src_dialog_password.cpp.o.d -o lifeograph.p/src_dialog_password.cpp.o -c ../src/dialog_password.cpp
[7/42] g++ -Ilifeograph.p -I. -I.. -I/usr/include/gtkmm-3.0 -I/usr/lib64/gtkmm-3.0/include -I/usr/include/giomm-2.4 -I/usr/lib64/giomm-2.4/include -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/sysprof-4 -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/glibmm-2.4 -I/usr/lib64/glibmm-2.4/include -I/usr/include/sigc++-2.0 -I/usr/lib64/sigc++-2.0/include -I/usr/include/gtk-3.0 -I/usr/include/pango-1.0 -I/usr/include/harfbuzz -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/fribidi -I/usr/include/libxml2 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/gio-unix-2.0 -I/usr/include/atk-1.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/dbus-1.0 -I/usr/lib64/dbus-1.0/include -I/usr/include/at-spi-2.0 -I/usr/include/cairomm-1.0 -I/usr/lib64/cairomm-1.0/include -I/usr/include/pangomm-1.4 -I/usr/lib64/pangomm-1.4/include -I/usr/include/atkmm-1.6 -I/usr/lib64/atkmm-1.6/include -I/usr/include/gtk-3.0/unix-print -I/usr/include/gdkmm-3.0 -I/usr/lib64/gdkmm-3.0/include -I/usr/include/enchant-2 -I/usr/include/champlain-0.12 -I/usr/include/clutter-gtk-1.0 -I/usr/include/clutter-1.0 -I/usr/include/cogl -I/usr/include/libdrm -I/usr/include/json-glib-1.0 -I/usr/include/libsoup-2.4 -fdiagnostics-color=always -pipe -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -Wnon-virtual-dtor -std=c++14 -DGETTEXT_PACKAGE=net.sourceforge.Lifeograph -DHAVE_CONFIG_H -O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -pthread -MD -MQ lifeograph.p/src_dialog_export.cpp.o -MF lifeograph.p/src_dialog_export.cpp.o.d -o lifeograph.p/src_dialog_export.cpp.o -c ../src/dialog_export.cpp
[8/42] g++ -Ilifeograph.p -I. -I.. -I/usr/include/gtkmm-3.0 -I/usr/lib64/gtkmm-3.0/include -I/usr/include/giomm-2.4 -I/usr/lib64/giomm-2.4/include -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/sysprof-4 -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/glibmm-2.4 -I/usr/lib64/glibmm-2.4/include -I/usr/include/sigc++-2.0 -I/usr/lib64/sigc++-2.0/include -I/usr/include/gtk-3.0 -I/usr/include/pango-1.0 -I/usr/include/harfbuzz -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/fribidi -I/usr/include/libxml2 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/gio-unix-2.0 -I/usr/include/atk-1.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/dbus-1.0 -I/usr/lib64/dbus-1.0/include -I/usr/include/at-spi-2.0 -I/usr/include/cairomm-1.0 -I/usr/lib64/cairomm-1.0/include -I/usr/include/pangomm-1.4 -I/usr/lib64/pangomm-1.4/include -I/usr/include/atkmm-1.6 -I/usr/lib64/atkmm-1.6/include -I/usr/include/gtk-3.0/unix-print -I/usr/include/gdkmm-3.0 -I/usr/lib64/gdkmm-3.0/include -I/usr/include/enchant-2 -I/usr/include/champlain-0.12 -I/usr/include/clutter-gtk-1.0 -I/usr/include/clutter-1.0 -I/usr/include/cogl -I/usr/include/libdrm -I/usr/include/json-glib-1.0 -I/usr/include/libsoup-2.4 -fdiagnostics-color=always -pipe -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -Wnon-virtual-dtor -std=c++14 -DGETTEXT_PACKAGE=net.sourceforge.Lifeograph -DHAVE_CONFIG_H -O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -pthread -MD -MQ lifeograph.p/src_app_window.cpp.o -MF lifeograph.p/src_app_window.cpp.o.d -o lifeograph.p/src_app_window.cpp.o -c ../src/app_window.cpp
[9/42] g++ -Ilifeograph.p -I. -I.. -I/usr/include/gtkmm-3.0 -I/usr/lib64/gtkmm-3.0/include -I/usr/include/giomm-2.4 -I/usr/lib64/giomm-2.4/include -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/sysprof-4 -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/glibmm-2.4 -I/usr/lib64/glibmm-2.4/include -I/usr/include/sigc++-2.0 -I/usr/lib64/sigc++-2.0/include -I/usr/include/gtk-3.0 -I/usr/include/pango-1.0 -I/usr/include/harfbuzz -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/fribidi -I/usr/include/libxml2 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/gio-unix-2.0 -I/usr/include/atk-1.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/dbus-1.0 -I/usr/lib64/dbus-1.0/include -I/usr/include/at-spi-2.0 -I/usr/include/cairomm-1.0 -I/usr/lib64/cairomm-1.0/include -I/usr/include/pangomm-1.4 -I/usr/lib64/pangomm-1.4/include -I/usr/include/atkmm-1.6 -I/usr/lib64/atkmm-1.6/include -I/usr/include/gtk-3.0/unix-print -I/usr/include/gdkmm-3.0 -I/usr/lib64/gdkmm-3.0/include -I/usr/include/enchant-2 -I/usr/include/champlain-0.12 -I/usr/include/clutter-gtk-1.0 -I/usr/include/clutter-1.0 -I/usr/include/cogl -I/usr/include/libdrm -I/usr/include/json-glib-1.0 -I/usr/include/libsoup-2.4 -fdiagnostics-color=always -pipe -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -Wnon-virtual-dtor -std=c++14 -DGETTEXT_PACKAGE=net.sourceforge.Lifeograph -DHAVE_CONFIG_H -O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -pthread -MD -MQ lifeograph.p/src_diarydata.cpp.o -MF lifeograph.p/src_diarydata.cpp.o.d -o lifeograph.p/src_diarydata.cpp.o -c ../src/diarydata.cpp
[10/42] g++ -Ilifeograph.p -I. -I.. -I/usr/include/gtkmm-3.0 -I/usr/lib64/gtkmm-3.0/include -I/usr/include/giomm-2.4 -I/usr/lib64/giomm-2.4/include -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/sysprof-4 -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/glibmm-2.4 -I/usr/lib64/glibmm-2.4/include -I/usr/include/sigc++-2.0 -I/usr/lib64/sigc++-2.0/include -I/usr/include/gtk-3.0 -I/usr/include/pango-1.0 -I/usr/include/harfbuzz -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/fribidi -I/usr/include/libxml2 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/gio-unix-2.0 -I/usr/include/atk-1.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/dbus-1.0 -I/usr/lib64/dbus-1.0/include -I/usr/include/at-spi-2.0 -I/usr/include/cairomm-1.0 -I/usr/lib64/cairomm-1.0/include -I/usr/include/pangomm-1.4 -I/usr/lib64/pangomm-1.4/include -I/usr/include/atkmm-1.6 -I/usr/lib64/atkmm-1.6/include -I/usr/include/gtk-3.0/unix-print -I/usr/include/gdkmm-3.0 -I/usr/lib64/gdkmm-3.0/include -I/usr/include/enchant-2 -I/usr/include/champlain-0.12 -I/usr/include/clutter-gtk-1.0 -I/usr/include/clutter-1.0 -I/usr/include/cogl -I/usr/include/libdrm -I/usr/include/json-glib-1.0 -I/usr/include/libsoup-2.4 -fdiagnostics-color=always -pipe -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -Wnon-virtual-dtor -std=c++14 -DGETTEXT_PACKAGE=net.sourceforge.Lifeograph -DHAVE_CONFIG_H -O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -pthread -MD -MQ lifeograph.p/src_dialog_sync.cpp.o -MF lifeograph.p/src_dialog_sync.cpp.o.d -o lifeograph.p/src_dialog_sync.cpp.o -c ../src/dialog_sync.cpp
[11/42] g++ -Ilifeograph.p -I. -I.. -I/usr/include/gtkmm-3.0 -I/usr/lib64/gtkmm-3.0/include -I/usr/include/giomm-2.4 -I/usr/lib64/giomm-2.4/include -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/sysprof-4 -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/glibmm-2.4 -I/usr/lib64/glibmm-2.4/include -I/usr/include/sigc++-2.0 -I/usr/lib64/sigc++-2.0/include -I/usr/include/gtk-3.0 -I/usr/include/pango-1.0 -I/usr/include/harfbuzz -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/fribidi -I/usr/include/libxml2 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/gio-unix-2.0 -I/usr/include/atk-1.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/dbus-1.0 -I/usr/lib64/dbus-1.0/include -I/usr/include/at-spi-2.0 -I/usr/include/cairomm-1.0 -I/usr/lib64/cairomm-1.0/include -I/usr/include/pangomm-1.4 -I/usr/lib64/pangomm-1.4/include -I/usr/include/atkmm-1.6 -I/usr/lib64/atkmm-1.6/include -I/usr/include/gtk-3.0/unix-print -I/usr/include/gdkmm-3.0 -I/usr/lib64/gdkmm-3.0/include -I/usr/include/enchant-2 -I/usr/include/champlain-0.12 -I/usr/include/clutter-gtk-1.0 -I/usr/include/clutter-1.0 -I/usr/include/cogl -I/usr/include/libdrm -I/usr/include/json-glib-1.0 -I/usr/include/libsoup-2.4 -fdiagnostics-color=always -pipe -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -Wnon-virtual-dtor -std=c++14 -DGETTEXT_PACKAGE=net.sourceforge.Lifeograph -DHAVE_CONFIG_H -O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -pthread -MD -MQ lifeograph.p/src_filtering.cpp.o -MF lifeograph.p/src_filtering.cpp.o.d -o lifeograph.p/src_filtering.cpp.o -c ../src/filtering.cpp
[12/42] g++ -Ilifeograph.p -I. -I.. -I/usr/include/gtkmm-3.0 -I/usr/lib64/gtkmm-3.0/include -I/usr/include/giomm-2.4 -I/usr/lib64/giomm-2.4/include -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/sysprof-4 -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/glibmm-2.4 -I/usr/lib64/glibmm-2.4/include -I/usr/include/sigc++-2.0 -I/usr/lib64/sigc++-2.0/include -I/usr/include/gtk-3.0 -I/usr/include/pango-1.0 -I/usr/include/harfbuzz -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/fribidi -I/usr/include/libxml2 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/gio-unix-2.0 -I/usr/include/atk-1.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/dbus-1.0 -I/usr/lib64/dbus-1.0/include -I/usr/include/at-spi-2.0 -I/usr/include/cairomm-1.0 -I/usr/lib64/cairomm-1.0/include -I/usr/include/pangomm-1.4 -I/usr/lib64/pangomm-1.4/include -I/usr/include/atkmm-1.6 -I/usr/lib64/atkmm-1.6/include -I/usr/include/gtk-3.0/unix-print -I/usr/include/gdkmm-3.0 -I/usr/lib64/gdkmm-3.0/include -I/usr/include/enchant-2 -I/usr/include/champlain-0.12 -I/usr/include/clutter-gtk-1.0 -I/usr/include/clutter-1.0 -I/usr/include/cogl -I/usr/include/libdrm -I/usr/include/json-glib-1.0 -I/usr/include/libsoup-2.4 -fdiagnostics-color=always -pipe -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -Wnon-virtual-dtor -std=c++14 -DGETTEXT_PACKAGE=net.sourceforge.Lifeograph -DHAVE_CONFIG_H -O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -pthread -MD -MQ lifeograph.p/src_main.cpp.o -MF lifeograph.p/src_main.cpp.o.d -o lifeograph.p/src_main.cpp.o -c ../src/main.cpp
[13/42] g++ -Ilifeograph.p -I. -I.. -I/usr/include/gtkmm-3.0 -I/usr/lib64/gtkmm-3.0/include -I/usr/include/giomm-2.4 -I/usr/lib64/giomm-2.4/include -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/sysprof-4 -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/glibmm-2.4 -I/usr/lib64/glibmm-2.4/include -I/usr/include/sigc++-2.0 -I/usr/lib64/sigc++-2.0/include -I/usr/include/gtk-3.0 -I/usr/include/pango-1.0 -I/usr/include/harfbuzz -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/fribidi -I/usr/include/libxml2 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/gio-unix-2.0 -I/usr/include/atk-1.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/dbus-1.0 -I/usr/lib64/dbus-1.0/include -I/usr/include/at-spi-2.0 -I/usr/include/cairomm-1.0 -I/usr/lib64/cairomm-1.0/include -I/usr/include/pangomm-1.4 -I/usr/lib64/pangomm-1.4/include -I/usr/include/atkmm-1.6 -I/usr/lib64/atkmm-1.6/include -I/usr/include/gtk-3.0/unix-print -I/usr/include/gdkmm-3.0 -I/usr/lib64/gdkmm-3.0/include -I/usr/include/enchant-2 -I/usr/include/champlain-0.12 -I/usr/include/clutter-gtk-1.0 -I/usr/include/clutter-1.0 -I/usr/include/cogl -I/usr/include/libdrm -I/usr/include/json-glib-1.0 -I/usr/include/libsoup-2.4 -fdiagnostics-color=always -pipe -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -Wnon-virtual-dtor -std=c++14 -DGETTEXT_PACKAGE=net.sourceforge.Lifeograph -DHAVE_CONFIG_H -O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -pthread -MD -MQ lifeograph.p/src_helpers.cpp.o -MF lifeograph.p/src_helpers.cpp.o.d -o lifeograph.p/src_helpers.cpp.o -c ../src/helpers.cpp
[14/42] g++ -Ilifeograph.p -I. -I.. -I/usr/include/gtkmm-3.0 -I/usr/lib64/gtkmm-3.0/include -I/usr/include/giomm-2.4 -I/usr/lib64/giomm-2.4/include -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/sysprof-4 -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/glibmm-2.4 -I/usr/lib64/glibmm-2.4/include -I/usr/include/sigc++-2.0 -I/usr/lib64/sigc++-2.0/include -I/usr/include/gtk-3.0 -I/usr/include/pango-1.0 -I/usr/include/harfbuzz -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/fribidi -I/usr/include/libxml2 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/gio-unix-2.0 -I/usr/include/atk-1.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/dbus-1.0 -I/usr/lib64/dbus-1.0/include -I/usr/include/at-spi-2.0 -I/usr/include/cairomm-1.0 -I/usr/lib64/cairomm-1.0/include -I/usr/include/pangomm-1.4 -I/usr/lib64/pangomm-1.4/include -I/usr/include/atkmm-1.6 -I/usr/lib64/atkmm-1.6/include -I/usr/include/gtk-3.0/unix-print -I/usr/include/gdkmm-3.0 -I/usr/lib64/gdkmm-3.0/include -I/usr/include/enchant-2 -I/usr/include/champlain-0.12 -I/usr/include/clutter-gtk-1.0 -I/usr/include/clutter-1.0 -I/usr/include/cogl -I/usr/include/libdrm -I/usr/include/json-glib-1.0 -I/usr/include/libsoup-2.4 -fdiagnostics-color=always -pipe -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -Wnon-virtual-dtor -std=c++14 -DGETTEXT_PACKAGE=net.sourceforge.Lifeograph -DHAVE_CONFIG_H -O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -pthread -MD -MQ lifeograph.p/src_entry.cpp.o -MF lifeograph.p/src_entry.cpp.o.d -o lifeograph.p/src_entry.cpp.o -c ../src/entry.cpp
[15/42] g++ -Ilifeograph.p -I. -I.. -I/usr/include/gtkmm-3.0 -I/usr/lib64/gtkmm-3.0/include -I/usr/include/giomm-2.4 -I/usr/lib64/giomm-2.4/include -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/sysprof-4 -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/glibmm-2.4 -I/usr/lib64/glibmm-2.4/include -I/usr/include/sigc++-2.0 -I/usr/lib64/sigc++-2.0/include -I/usr/include/gtk-3.0 -I/usr/include/pango-1.0 -I/usr/include/harfbuzz -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/fribidi -I/usr/include/libxml2 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/gio-unix-2.0 -I/usr/include/atk-1.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/dbus-1.0 -I/usr/lib64/dbus-1.0/include -I/usr/include/at-spi-2.0 -I/usr/include/cairomm-1.0 -I/usr/lib64/cairomm-1.0/include -I/usr/include/pangomm-1.4 -I/usr/lib64/pangomm-1.4/include -I/usr/include/atkmm-1.6 -I/usr/lib64/atkmm-1.6/include -I/usr/include/gtk-3.0/unix-print -I/usr/include/gdkmm-3.0 -I/usr/lib64/gdkmm-3.0/include -I/usr/include/enchant-2 -I/usr/include/champlain-0.12 -I/usr/include/clutter-gtk-1.0 -I/usr/include/clutter-1.0 -I/usr/include/cogl -I/usr/include/libdrm -I/usr/include/json-glib-1.0 -I/usr/include/libsoup-2.4 -fdiagnostics-color=always -pipe -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -Wnon-virtual-dtor -std=c++14 -DGETTEXT_PACKAGE=net.sourceforge.Lifeograph -DHAVE_CONFIG_H -O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -pthread -MD -MQ lifeograph.p/src_lifeograph.cpp.o -MF lifeograph.p/src_lifeograph.cpp.o.d -o lifeograph.p/src_lifeograph.cpp.o -c ../src/lifeograph.cpp
[16/42] g++ -Ilifeograph.p -I. -I.. -I/usr/include/gtkmm-3.0 -I/usr/lib64/gtkmm-3.0/include -I/usr/include/giomm-2.4 -I/usr/lib64/giomm-2.4/include -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/sysprof-4 -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/glibmm-2.4 -I/usr/lib64/glibmm-2.4/include -I/usr/include/sigc++-2.0 -I/usr/lib64/sigc++-2.0/include -I/usr/include/gtk-3.0 -I/usr/include/pango-1.0 -I/usr/include/harfbuzz -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/fribidi -I/usr/include/libxml2 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/gio-unix-2.0 -I/usr/include/atk-1.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/dbus-1.0 -I/usr/lib64/dbus-1.0/include -I/usr/include/at-spi-2.0 -I/usr/include/cairomm-1.0 -I/usr/lib64/cairomm-1.0/include -I/usr/include/pangomm-1.4 -I/usr/lib64/pangomm-1.4/include -I/usr/include/atkmm-1.6 -I/usr/lib64/atkmm-1.6/include -I/usr/include/gtk-3.0/unix-print -I/usr/include/gdkmm-3.0 -I/usr/lib64/gdkmm-3.0/include -I/usr/include/enchant-2 -I/usr/include/champlain-0.12 -I/usr/include/clutter-gtk-1.0 -I/usr/include/clutter-1.0 -I/usr/include/cogl -I/usr/include/libdrm -I/usr/include/json-glib-1.0 -I/usr/include/libsoup-2.4 -fdiagnostics-color=always -pipe -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -Wnon-virtual-dtor -std=c++14 -DGETTEXT_PACKAGE=net.sourceforge.Lifeograph -DHAVE_CONFIG_H -O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -pthread -MD -MQ lifeograph.p/src_parser_paragraph.cpp.o -MF lifeograph.p/src_parser_paragraph.cpp.o.d -o lifeograph.p/src_parser_paragraph.cpp.o -c ../src/parser_paragraph.cpp
[17/42] g++ -Ilifeograph.p -I. -I.. -I/usr/include/gtkmm-3.0 -I/usr/lib64/gtkmm-3.0/include -I/usr/include/giomm-2.4 -I/usr/lib64/giomm-2.4/include -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/sysprof-4 -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/glibmm-2.4 -I/usr/lib64/glibmm-2.4/include -I/usr/include/sigc++-2.0 -I/usr/lib64/sigc++-2.0/include -I/usr/include/gtk-3.0 -I/usr/include/pango-1.0 -I/usr/include/harfbuzz -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/fribidi -I/usr/include/libxml2 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/gio-unix-2.0 -I/usr/include/atk-1.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/dbus-1.0 -I/usr/lib64/dbus-1.0/include -I/usr/include/at-spi-2.0 -I/usr/include/cairomm-1.0 -I/usr/lib64/cairomm-1.0/include -I/usr/include/pangomm-1.4 -I/usr/lib64/pangomm-1.4/include -I/usr/include/atkmm-1.6 -I/usr/lib64/atkmm-1.6/include -I/usr/include/gtk-3.0/unix-print -I/usr/include/gdkmm-3.0 -I/usr/lib64/gdkmm-3.0/include -I/usr/include/enchant-2 -I/usr/include/champlain-0.12 -I/usr/include/clutter-gtk-1.0 -I/usr/include/clutter-1.0 -I/usr/include/cogl -I/usr/include/libdrm -I/usr/include/json-glib-1.0 -I/usr/include/libsoup-2.4 -fdiagnostics-color=always -pipe -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -Wnon-virtual-dtor -std=c++14 -DGETTEXT_PACKAGE=net.sourceforge.Lifeograph -DHAVE_CONFIG_H -O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -pthread -MD -MQ lifeograph.p/src_diary.cpp.o -MF lifeograph.p/src_diary.cpp.o.d -o lifeograph.p/src_diary.cpp.o -c ../src/diary.cpp
../src/diary.cpp: In member function ‘void LIFEO::Diary::set_entry_date(LIFEO::Entry*, HELPERS::date_t)’:
../src/diary.cpp:2285:55: warning: narrowing conversion of ‘((LIFEO::Diary*)this)->LIFEO::Diary::get_first_descendant(entry->LIFEO::Entry::<anonymous>.LIFEO::DiaryElement::get_date_t())’ from ‘LIFEO::Entry*’ to ‘bool’ [-Wnarrowing]
 2285 |     bool       flag_has_children{ get_first_descendant( entry->get_date_t() ) };
      |                                   ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
[18/42] g++ -Ilifeograph.p -I. -I.. -I/usr/include/gtkmm-3.0 -I/usr/lib64/gtkmm-3.0/include -I/usr/include/giomm-2.4 -I/usr/lib64/giomm-2.4/include -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/sysprof-4 -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/glibmm-2.4 -I/usr/lib64/glibmm-2.4/include -I/usr/include/sigc++-2.0 -I/usr/lib64/sigc++-2.0/include -I/usr/include/gtk-3.0 -I/usr/include/pango-1.0 -I/usr/include/harfbuzz -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/fribidi -I/usr/include/libxml2 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/gio-unix-2.0 -I/usr/include/atk-1.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/dbus-1.0 -I/usr/lib64/dbus-1.0/include -I/usr/include/at-spi-2.0 -I/usr/include/cairomm-1.0 -I/usr/lib64/cairomm-1.0/include -I/usr/include/pangomm-1.4 -I/usr/lib64/pangomm-1.4/include -I/usr/include/atkmm-1.6 -I/usr/lib64/atkmm-1.6/include -I/usr/include/gtk-3.0/unix-print -I/usr/include/gdkmm-3.0 -I/usr/lib64/gdkmm-3.0/include -I/usr/include/enchant-2 -I/usr/include/champlain-0.12 -I/usr/include/clutter-gtk-1.0 -I/usr/include/clutter-1.0 -I/usr/include/cogl -I/usr/include/libdrm -I/usr/include/json-glib-1.0 -I/usr/include/libsoup-2.4 -fdiagnostics-color=always -pipe -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -Wnon-virtual-dtor -std=c++14 -DGETTEXT_PACKAGE=net.sourceforge.Lifeograph -DHAVE_CONFIG_H -O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -pthread -MD -MQ lifeograph.p/src_parser_text.cpp.o -MF lifeograph.p/src_parser_text.cpp.o.d -o lifeograph.p/src_parser_text.cpp.o -c ../src/parser_text.cpp
[19/42] g++ -Ilifeograph.p -I. -I.. -I/usr/include/gtkmm-3.0 -I/usr/lib64/gtkmm-3.0/include -I/usr/include/giomm-2.4 -I/usr/lib64/giomm-2.4/include -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/sysprof-4 -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/glibmm-2.4 -I/usr/lib64/glibmm-2.4/include -I/usr/include/sigc++-2.0 -I/usr/lib64/sigc++-2.0/include -I/usr/include/gtk-3.0 -I/usr/include/pango-1.0 -I/usr/include/harfbuzz -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/fribidi -I/usr/include/libxml2 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/gio-unix-2.0 -I/usr/include/atk-1.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/dbus-1.0 -I/usr/lib64/dbus-1.0/include -I/usr/include/at-spi-2.0 -I/usr/include/cairomm-1.0 -I/usr/lib64/cairomm-1.0/include -I/usr/include/pangomm-1.4 -I/usr/lib64/pangomm-1.4/include -I/usr/include/atkmm-1.6 -I/usr/lib64/atkmm-1.6/include -I/usr/include/gtk-3.0/unix-print -I/usr/include/gdkmm-3.0 -I/usr/lib64/gdkmm-3.0/include -I/usr/include/enchant-2 -I/usr/include/champlain-0.12 -I/usr/include/clutter-gtk-1.0 -I/usr/include/clutter-1.0 -I/usr/include/cogl -I/usr/include/libdrm -I/usr/include/json-glib-1.0 -I/usr/include/libsoup-2.4 -fdiagnostics-color=always -pipe -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -Wnon-virtual-dtor -std=c++14 -DGETTEXT_PACKAGE=net.sourceforge.Lifeograph -DHAVE_CONFIG_H -O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -pthread -MD -MQ lifeograph.p/src_undo.cpp.o -MF lifeograph.p/src_undo.cpp.o.d -o lifeograph.p/src_undo.cpp.o -c ../src/undo.cpp
[20/42] g++ -Ilifeograph.p -I. -I.. -I/usr/include/gtkmm-3.0 -I/usr/lib64/gtkmm-3.0/include -I/usr/include/giomm-2.4 -I/usr/lib64/giomm-2.4/include -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/sysprof-4 -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/glibmm-2.4 -I/usr/lib64/glibmm-2.4/include -I/usr/include/sigc++-2.0 -I/usr/lib64/sigc++-2.0/include -I/usr/include/gtk-3.0 -I/usr/include/pango-1.0 -I/usr/include/harfbuzz -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/fribidi -I/usr/include/libxml2 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/gio-unix-2.0 -I/usr/include/atk-1.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/dbus-1.0 -I/usr/lib64/dbus-1.0/include -I/usr/include/at-spi-2.0 -I/usr/include/cairomm-1.0 -I/usr/lib64/cairomm-1.0/include -I/usr/include/pangomm-1.4 -I/usr/lib64/pangomm-1.4/include -I/usr/include/atkmm-1.6 -I/usr/lib64/atkmm-1.6/include -I/usr/include/gtk-3.0/unix-print -I/usr/include/gdkmm-3.0 -I/usr/lib64/gdkmm-3.0/include -I/usr/include/enchant-2 -I/usr/include/champlain-0.12 -I/usr/include/clutter-gtk-1.0 -I/usr/include/clutter-1.0 -I/usr/include/cogl -I/usr/include/libdrm -I/usr/include/json-glib-1.0 -I/usr/include/libsoup-2.4 -fdiagnostics-color=always -pipe -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -Wnon-virtual-dtor -std=c++14 -DGETTEXT_PACKAGE=net.sourceforge.Lifeograph -DHAVE_CONFIG_H -O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -pthread -MD -MQ lifeograph.p/src_settings.cpp.o -MF lifeograph.p/src_settings.cpp.o.d -o lifeograph.p/src_settings.cpp.o -c ../src/settings.cpp
[21/42] g++ -Ilifeograph.p -I. -I.. -I/usr/include/gtkmm-3.0 -I/usr/lib64/gtkmm-3.0/include -I/usr/include/giomm-2.4 -I/usr/lib64/giomm-2.4/include -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/sysprof-4 -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/glibmm-2.4 -I/usr/lib64/glibmm-2.4/include -I/usr/include/sigc++-2.0 -I/usr/lib64/sigc++-2.0/include -I/usr/include/gtk-3.0 -I/usr/include/pango-1.0 -I/usr/include/harfbuzz -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/fribidi -I/usr/include/libxml2 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/gio-unix-2.0 -I/usr/include/atk-1.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/dbus-1.0 -I/usr/lib64/dbus-1.0/include -I/usr/include/at-spi-2.0 -I/usr/include/cairomm-1.0 -I/usr/lib64/cairomm-1.0/include -I/usr/include/pangomm-1.4 -I/usr/lib64/pangomm-1.4/include -I/usr/include/atkmm-1.6 -I/usr/lib64/atkmm-1.6/include -I/usr/include/gtk-3.0/unix-print -I/usr/include/gdkmm-3.0 -I/usr/lib64/gdkmm-3.0/include -I/usr/include/enchant-2 -I/usr/include/champlain-0.12 -I/usr/include/clutter-gtk-1.0 -I/usr/include/clutter-1.0 -I/usr/include/cogl -I/usr/include/libdrm -I/usr/include/json-glib-1.0 -I/usr/include/libsoup-2.4 -fdiagnostics-color=always -pipe -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -Wnon-virtual-dtor -std=c++14 -DGETTEXT_PACKAGE=net.sourceforge.Lifeograph -DHAVE_CONFIG_H -O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -pthread -MD -MQ lifeograph.p/src_ui_extra.cpp.o -MF lifeograph.p/src_ui_extra.cpp.o.d -o lifeograph.p/src_ui_extra.cpp.o -c ../src/ui_extra.cpp
FAILED: lifeograph.p/src_ui_extra.cpp.o 
g++ -Ilifeograph.p -I. -I.. -I/usr/include/gtkmm-3.0 -I/usr/lib64/gtkmm-3.0/include -I/usr/include/giomm-2.4 -I/usr/lib64/giomm-2.4/include -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/sysprof-4 -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/glibmm-2.4 -I/usr/lib64/glibmm-2.4/include -I/usr/include/sigc++-2.0 -I/usr/lib64/sigc++-2.0/include -I/usr/include/gtk-3.0 -I/usr/include/pango-1.0 -I/usr/include/harfbuzz -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/fribidi -I/usr/include/libxml2 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/gio-unix-2.0 -I/usr/include/atk-1.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/dbus-1.0 -I/usr/lib64/dbus-1.0/include -I/usr/include/at-spi-2.0 -I/usr/include/cairomm-1.0 -I/usr/lib64/cairomm-1.0/include -I/usr/include/pangomm-1.4 -I/usr/lib64/pangomm-1.4/include -I/usr/include/atkmm-1.6 -I/usr/lib64/atkmm-1.6/include -I/usr/include/gtk-3.0/unix-print -I/usr/include/gdkmm-3.0 -I/usr/lib64/gdkmm-3.0/include -I/usr/include/enchant-2 -I/usr/include/champlain-0.12 -I/usr/include/clutter-gtk-1.0 -I/usr/include/clutter-1.0 -I/usr/include/cogl -I/usr/include/libdrm -I/usr/include/json-glib-1.0 -I/usr/include/libsoup-2.4 -fdiagnostics-color=always -pipe -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -Wnon-virtual-dtor -std=c++14 -DGETTEXT_PACKAGE=net.sourceforge.Lifeograph -DHAVE_CONFIG_H -O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -pthread -MD -MQ lifeograph.p/src_ui_extra.cpp.o -MF lifeograph.p/src_ui_extra.cpp.o.d -o lifeograph.p/src_ui_extra.cpp.o -c ../src/ui_extra.cpp
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:56:3: error: template with C linkage
   56 |   template<typename _Tp, _Tp __v>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:71:3: error: template with C linkage
   71 |   template<typename _Tp, _Tp __v>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:80:3: error: template with C linkage
   80 |   template<bool __v>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:91:3: error: template with C linkage
   91 |   template<bool, typename, typename>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:94:3: error: template with C linkage
   94 |   template <typename _Type>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:98:3: error: template with C linkage
   98 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:101:3: error: template with C linkage
  101 |   template<typename...>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:104:3: error: template specialization with C linkage
  104 |   template<>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:109:3: error: template with C linkage
  109 |   template<typename _B1>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:114:3: error: template with C linkage
  114 |   template<typename _B1, typename _B2>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:119:3: error: template with C linkage
  119 |   template<typename _B1, typename _B2, typename _B3, typename... _Bn>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:124:3: error: template with C linkage
  124 |   template<typename...>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:127:3: error: template specialization with C linkage
  127 |   template<>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:132:3: error: template with C linkage
  132 |   template<typename _B1>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:137:3: error: template with C linkage
  137 |   template<typename _B1, typename _B2>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:142:3: error: template with C linkage
  142 |   template<typename _B1, typename _B2, typename _B3, typename... _Bn>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:147:3: error: template with C linkage
  147 |   template<typename _Pp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:188:3: error: template with C linkage
  188 |   template<typename>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:190:3: error: template with C linkage
  190 |   template<typename>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:192:3: error: template with C linkage
  192 |   template<typename>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:194:3: error: template with C linkage
  194 |   template<typename>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:200:3: error: template with C linkage
  200 |   template <typename _Tp, size_t = sizeof(_Tp)>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:204:3: error: template with C linkage
  204 |   template <typename _TypeIdentity,
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:219:3: error: template with C linkage
  219 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:226:3: error: template with C linkage
  226 |   template<typename>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:230:3: error: template with C linkage
  230 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:233:3: error: template with C linkage
  233 |   template<typename>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:238:3: error: template with C linkage
  238 |   template<typename>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:242:3: error: template specialization with C linkage
  242 |   template<>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:247:3: error: template with C linkage
  247 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:252:3: error: template with C linkage
  252 |   template<typename>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:256:3: error: template specialization with C linkage
  256 |   template<>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:260:3: error: template specialization with C linkage
  260 |   template<>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:264:3: error: template specialization with C linkage
  264 |   template<>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:268:3: error: template specialization with C linkage
  268 |   template<>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:276:3: error: template specialization with C linkage
  276 |   template<>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:287:3: error: template specialization with C linkage
  287 |   template<>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:291:3: error: template specialization with C linkage
  291 |   template<>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:295:3: error: template specialization with C linkage
  295 |   template<>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:299:3: error: template specialization with C linkage
  299 |   template<>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:303:3: error: template specialization with C linkage
  303 |   template<>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:307:3: error: template specialization with C linkage
  307 |   template<>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:311:3: error: template specialization with C linkage
  311 |   template<>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:315:3: error: template specialization with C linkage
  315 |   template<>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:319:3: error: template specialization with C linkage
  319 |   template<>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:323:3: error: template specialization with C linkage
  323 |   template<>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:367:3: error: template with C linkage
  367 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:372:3: error: template with C linkage
  372 |   template<typename>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:376:3: error: template specialization with C linkage
  376 |   template<>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:380:3: error: template specialization with C linkage
  380 |   template<>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:384:3: error: template specialization with C linkage
  384 |   template<>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:395:3: error: template with C linkage
  395 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:401:3: error: template with C linkage
  401 |   template<typename>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:405:3: error: template with C linkage
  405 |   template<typename _Tp, std::size_t _Size>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:409:3: error: template with C linkage
  409 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:413:3: error: template with C linkage
  413 |   template<typename>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:417:3: error: template with C linkage
  417 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:422:3: error: template with C linkage
  422 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:428:3: error: template with C linkage
  428 |   template<typename>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:432:3: error: template with C linkage
  432 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:437:3: error: template with C linkage
  437 |   template<typename>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:441:3: error: template with C linkage
  441 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:445:3: error: template with C linkage
  445 |   template<typename>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:449:3: error: template with C linkage
  449 |   template<typename _Tp, typename _Cp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:454:3: error: template with C linkage
  454 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:459:3: error: template with C linkage
  459 |   template<typename>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:463:3: error: template with C linkage
  463 |   template<typename _Tp, typename _Cp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:468:3: error: template with C linkage
  468 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:474:3: error: template with C linkage
  474 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:480:3: error: template with C linkage
  480 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:486:3: error: template with C linkage
  486 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:492:3: error: template with C linkage
  492 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:496:3: error: template with C linkage
  496 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:500:3: error: template with C linkage
  500 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:506:3: error: template with C linkage
  506 |   template<typename>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:510:3: error: template specialization with C linkage
  510 |   template<>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:515:3: error: template with C linkage
  515 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:521:3: error: template with C linkage
  521 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:529:3: error: template with C linkage
  529 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:536:3: error: template with C linkage
  536 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:542:3: error: template with C linkage
  542 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:549:3: error: template with C linkage
  549 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:555:3: error: template with C linkage
  555 |   template<typename>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:559:3: error: template with C linkage
  559 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:566:3: error: template with C linkage
  566 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:570:3: error: template with C linkage
  570 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:574:3: error: template with C linkage
  574 |   template<typename _Tp, typename _Cp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:579:3: error: template with C linkage
  579 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:584:3: error: template with C linkage
  584 |   template<typename, typename>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:587:3: error: template with C linkage
  587 |   template<typename _Tp, typename... _Types>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:591:3: error: template with C linkage
  591 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:610:3: error: template with C linkage
  610 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:629:3: error: template with C linkage
  629 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:634:3: error: template with C linkage
  634 |   template<typename...> using __void_t = void;
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:638:3: error: template with C linkage
  638 |   template<typename _Tp, typename = void>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:643:3: error: template with C linkage
  643 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:651:3: error: template with C linkage
  651 |   template<typename>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:655:3: error: template with C linkage
  655 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:660:3: error: template with C linkage
  660 |   template<typename>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:664:3: error: template with C linkage
  664 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:669:3: error: template with C linkage
  669 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:678:3: error: template with C linkage
  678 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:687:3: error: template with C linkage
  687 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:697:3: error: template with C linkage
  697 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:708:3: error: template with C linkage
  708 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:719:3: error: template with C linkage
  719 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:725:3: error: template with C linkage
  725 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:733:3: error: template with C linkage
  733 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:740:3: error: template with C linkage
  740 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:745:3: error: template with C linkage
  745 |   template<typename _Tp,
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:750:3: error: template with C linkage
  750 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:756:3: error: template with C linkage
  756 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:762:3: error: template with C linkage
  762 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:775:3: error: template with C linkage
  775 |   template<typename _Tp, typename _Up = _Tp&&>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:779:3: error: template with C linkage
  779 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:783:3: error: template with C linkage
  783 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:786:3: error: template with C linkage
  786 |   template<typename, unsigned = 0>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:789:3: error: template with C linkage
  789 |   template<typename>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:792:3: error: template with C linkage
  792 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:797:3: error: template with C linkage
  797 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:809:5: error: template with C linkage
  809 |     template<typename _Tp, typename = decltype(declval<_Tp&>().~_Tp())>
      |     ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:812:5: error: template with C linkage
  812 |     template<typename>
      |     ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:816:3: error: template with C linkage
  816 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:823:3: error: template with C linkage
  823 |   template<typename _Tp,
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:830:3: error: template with C linkage
  830 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:836:3: error: template with C linkage
  836 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:840:3: error: template with C linkage
  840 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:845:3: error: template with C linkage
  845 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:859:5: error: template with C linkage
  859 |     template<typename _Tp>
      |     ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:863:5: error: template with C linkage
  863 |     template<typename>
      |     ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:867:3: error: template with C linkage
  867 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:874:3: error: template with C linkage
  874 |   template<typename _Tp,
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:881:3: error: template with C linkage
  881 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:887:3: error: template with C linkage
  887 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:891:3: error: template with C linkage
  891 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:896:3: error: template with C linkage
  896 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:904:3: error: template with C linkage
  904 |   template<typename _Tp, typename... _Args>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:910:3: error: template with C linkage
  910 |   template<typename _Tp, typename... _Args>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:919:3: error: template with C linkage
  919 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:927:3: error: template with C linkage
  927 |   template<typename _Tp, bool = __is_referenceable<_Tp>::value>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:930:3: error: template with C linkage
  930 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:934:3: error: template with C linkage
  934 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:940:3: error: template with C linkage
  940 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:948:3: error: template with C linkage
  948 |   template<typename _Tp, bool = __is_referenceable<_Tp>::value>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:951:3: error: template with C linkage
  951 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:955:3: error: template with C linkage
  955 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:961:3: error: template with C linkage
  961 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:969:3: error: template with C linkage
  969 |   template<typename _Tp, typename... _Args>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:974:3: error: template with C linkage
  974 |   template<typename _Tp, typename... _Args>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:983:3: error: template with C linkage
  983 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:992:3: error: template with C linkage
  992 |   template<typename _Tp, bool = __is_referenceable<_Tp>::value>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:995:3: error: template with C linkage
  995 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:999:3: error: template with C linkage
  999 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1005:3: error: template with C linkage
 1005 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1013:3: error: template with C linkage
 1013 |   template<typename _Tp, bool = __is_referenceable<_Tp>::value>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1016:3: error: template with C linkage
 1016 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1020:3: error: template with C linkage
 1020 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1026:3: error: template with C linkage
 1026 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1035:3: error: template with C linkage
 1035 |   template<typename _Tp, typename _Up>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1043:3: error: template with C linkage
 1043 |   template<typename _Tp, bool = __is_referenceable<_Tp>::value>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1046:3: error: template with C linkage
 1046 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1050:3: error: template with C linkage
 1050 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1056:3: error: template with C linkage
 1056 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1064:3: error: template with C linkage
 1064 |   template<typename _Tp, bool = __is_referenceable<_Tp>::value>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1067:3: error: template with C linkage
 1067 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1071:3: error: template with C linkage
 1071 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1077:3: error: template with C linkage
 1077 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1085:3: error: template with C linkage
 1085 |   template<typename _Tp, typename _Up>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1090:3: error: template with C linkage
 1090 |   template<typename _Tp, typename _Up>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1098:3: error: template with C linkage
 1098 |   template<typename _Tp, bool = __is_referenceable<_Tp>::value>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1101:3: error: template with C linkage
 1101 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1105:3: error: template with C linkage
 1105 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1111:3: error: template with C linkage
 1111 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1119:3: error: template with C linkage
 1119 |   template<typename _Tp, bool = __is_referenceable<_Tp>::value>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1122:3: error: template with C linkage
 1122 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1126:3: error: template with C linkage
 1126 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1132:3: error: template with C linkage
 1132 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1141:3: error: template with C linkage
 1141 |   template<typename _Tp, typename... _Args>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1150:3: error: template with C linkage
 1150 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1160:5: error: template with C linkage
 1160 |     template <typename _Tp>
      |     ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1163:5: error: template with C linkage
 1163 |     template <typename _Tp>
      |     ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1170:3: error: template with C linkage
 1170 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1177:3: error: template with C linkage
 1177 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1182:3: error: template with C linkage
 1182 |   template <typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1188:3: error: template with C linkage
 1188 |   template<typename _Tp, bool = __is_referenceable<_Tp>::value>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1191:3: error: template with C linkage
 1191 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1195:3: error: template with C linkage
 1195 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1203:3: error: template with C linkage
 1203 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1211:3: error: template with C linkage
 1211 |   template<typename _Tp, bool = __is_referenceable<_Tp>::value>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1214:3: error: template with C linkage
 1214 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1218:3: error: template with C linkage
 1218 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1226:3: error: template with C linkage
 1226 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1235:3: error: template with C linkage
 1235 |   template<typename _Tp, typename _Up>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1243:3: error: template with C linkage
 1243 |   template<typename _Tp, bool = __is_referenceable<_Tp>::value>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1246:3: error: template with C linkage
 1246 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1250:3: error: template with C linkage
 1250 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1256:3: error: template with C linkage
 1256 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1264:3: error: template with C linkage
 1264 |   template<typename _Tp, bool = __is_referenceable<_Tp>::value>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1267:3: error: template with C linkage
 1267 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1271:3: error: template with C linkage
 1271 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1277:3: error: template with C linkage
 1277 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1286:3: error: template with C linkage
 1286 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1297:3: error: template with C linkage
 1297 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1309:3: error: template with C linkage
 1309 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1318:3: error: template with C linkage
 1318 |   template<typename>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1322:3: error: template with C linkage
 1322 |   template<typename _Tp, std::size_t _Size>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1326:3: error: template with C linkage
 1326 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1331:3: error: template with C linkage
 1331 |   template<typename, unsigned _Uint>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1335:3: error: template with C linkage
 1335 |   template<typename _Tp, unsigned _Uint, std::size_t _Size>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1342:3: error: template with C linkage
 1342 |   template<typename _Tp, unsigned _Uint>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1353:3: error: template with C linkage
 1353 |   template<typename _Tp, typename _Up>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1370:3: error: template with C linkage
 1370 |   template<typename _Base, typename _Derived>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1375:3: error: template with C linkage
 1375 |   template<typename _From, typename _To,
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1385:3: error: template with C linkage
 1385 |   template<typename _From, typename _To>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1406:3: error: template with C linkage
 1406 |   template<typename _From, typename _To>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1412:3: error: template with C linkage
 1412 |   template<typename _ToElementType, typename _FromElementType>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1416:3: error: template with C linkage
 1416 |   template<typename _From, typename _To,
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1425:3: error: template with C linkage
 1425 |   template<typename _From, typename _To>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1446:3: error: template with C linkage
 1446 |   template<typename _From, typename _To>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1468:3: error: template with C linkage
 1468 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1472:3: error: template with C linkage
 1472 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1477:3: error: template with C linkage
 1477 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1481:3: error: template with C linkage
 1481 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1486:3: error: template with C linkage
 1486 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1490:3: error: template with C linkage
 1490 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1494:3: error: template with C linkage
 1494 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1498:3: error: template with C linkage
 1498 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1503:3: error: template with C linkage
 1503 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1508:3: error: template with C linkage
 1508 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1513:3: error: template with C linkage
 1513 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1525:3: error: template with C linkage
 1525 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1529:3: error: template with C linkage
 1529 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1533:3: error: template with C linkage
 1533 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1537:3: error: template with C linkage
 1537 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1541:3: error: template with C linkage
 1541 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1545:3: error: template with C linkage
 1545 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1552:3: error: template with C linkage
 1552 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1556:3: error: template with C linkage
 1556 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1560:3: error: template with C linkage
 1560 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1564:3: error: template with C linkage
 1564 |   template<typename _Tp, bool = __is_referenceable<_Tp>::value>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1568:3: error: template with C linkage
 1568 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1573:3: error: template with C linkage
 1573 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1578:3: error: template with C linkage
 1578 |   template<typename _Tp, bool = __is_referenceable<_Tp>::value>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1582:3: error: template with C linkage
 1582 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1587:3: error: template with C linkage
 1587 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1594:3: error: template with C linkage
 1594 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1598:3: error: template with C linkage
 1598 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1602:3: error: template with C linkage
 1602 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1609:3: error: template with C linkage
 1609 |   template<typename _Unqualified, bool _IsConst, bool _IsVol>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1612:3: error: template with C linkage
 1612 |   template<typename _Unqualified>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1616:3: error: template with C linkage
 1616 |   template<typename _Unqualified>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1620:3: error: template with C linkage
 1620 |   template<typename _Unqualified>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1624:3: error: template with C linkage
 1624 |   template<typename _Unqualified>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1628:3: error: template with C linkage
 1628 |   template<typename _Qualified, typename _Unqualified,
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1640:3: error: template with C linkage
 1640 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1644:3: error: template specialization with C linkage
 1644 |   template<>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1648:3: error: template specialization with C linkage
 1648 |   template<>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1652:3: error: template specialization with C linkage
 1652 |   template<>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1656:3: error: template specialization with C linkage
 1656 |   template<>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1660:3: error: template specialization with C linkage
 1660 |   template<>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1664:3: error: template specialization with C linkage
 1664 |   template<>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1690:3: error: template with C linkage
 1690 |   template<typename _Tp,
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1695:3: error: template with C linkage
 1695 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1709:5: error: template with C linkage
 1709 |     template<typename...> struct _List { };
      |     ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1711:5: error: template with C linkage
 1711 |     template<typename _Tp, typename... _Up>
      |     ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1715:5: error: template with C linkage
 1715 |     template<size_t _Sz, typename _Tp, bool = (_Sz <= _Tp::__size)>
      |     ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1718:5: error: template with C linkage
 1718 |     template<size_t _Sz, typename _Uint, typename... _UInts>
      |     ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1722:5: error: template with C linkage
 1722 |     template<size_t _Sz, typename _Uint, typename... _UInts>
      |     ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1729:3: error: template with C linkage
 1729 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1749:3: error: template specialization with C linkage
 1749 |   template<>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1766:3: error: template specialization with C linkage
 1766 |   template<>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1773:3: error: template specialization with C linkage
 1773 |   template<>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1784:3: error: template with C linkage
 1784 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1789:3: error: template specialization with C linkage
 1789 |   template<>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1794:3: error: template with C linkage
 1794 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1798:3: error: template specialization with C linkage
 1798 |   template<>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1802:3: error: template specialization with C linkage
 1802 |   template<>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1806:3: error: template specialization with C linkage
 1806 |   template<>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1810:3: error: template specialization with C linkage
 1810 |   template<>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1814:3: error: template specialization with C linkage
 1814 |   template<>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1818:3: error: template specialization with C linkage
 1818 |   template<>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1844:3: error: template with C linkage
 1844 |   template<typename _Tp,
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1849:3: error: template with C linkage
 1849 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1861:3: error: template with C linkage
 1861 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1875:3: error: template specialization with C linkage
 1875 |   template<>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1892:3: error: template specialization with C linkage
 1892 |   template<>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1899:3: error: template specialization with C linkage
 1899 |   template<>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1910:3: error: template with C linkage
 1910 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1915:3: error: template specialization with C linkage
 1915 |   template<>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1920:3: error: template with C linkage
 1920 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1924:3: error: template with C linkage
 1924 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1931:3: error: template with C linkage
 1931 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1935:3: error: template with C linkage
 1935 |   template<typename _Tp, std::size_t _Size>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1939:3: error: template with C linkage
 1939 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1944:3: error: template with C linkage
 1944 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1948:3: error: template with C linkage
 1948 |   template<typename _Tp, std::size_t _Size>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1952:3: error: template with C linkage
 1952 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1958:3: error: template with C linkage
 1958 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1962:3: error: template with C linkage
 1962 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1968:3: error: template with C linkage
 1968 |   template<typename _Tp, typename>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1972:3: error: template with C linkage
 1972 |   template<typename _Tp, typename _Up>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1977:3: error: template with C linkage
 1977 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1983:3: error: template with C linkage
 1983 |   template<typename _Tp, bool = __or_<__is_referenceable<_Tp>,
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1988:3: error: template with C linkage
 1988 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1992:3: error: template with C linkage
 1992 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:1999:3: error: template with C linkage
 1999 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2003:3: error: template with C linkage
 2003 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2007:3: error: template with C linkage
 2007 |   template<std::size_t _Len>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2027:3: error: template with C linkage
 2027 |   template<std::size_t _Len, std::size_t _Align =
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2038:3: error: template with C linkage
 2038 |   template <typename... _Types>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2045:3: error: template with C linkage
 2045 |   template <typename _Tp, typename... _Types>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2066:3: error: template with C linkage
 2066 |   template <size_t _Len, typename... _Types>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2082:3: error: template with C linkage
 2082 |   template <size_t _Len, typename... _Types>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2087:3: error: template with C linkage
 2087 |   template<typename _Up,
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2093:3: error: template with C linkage
 2093 |   template<typename _Up>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2097:3: error: template with C linkage
 2097 |   template<typename _Up>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2101:3: error: template with C linkage
 2101 |   template<typename _Up>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2106:3: error: template with C linkage
 2106 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2116:3: error: template with C linkage
 2116 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2119:3: error: template with C linkage
 2119 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2123:3: error: template with C linkage
 2123 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2129:3: error: template with C linkage
 2129 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2135:3: error: template with C linkage
 2135 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2141:3: error: template with C linkage
 2141 |   template<bool, typename _Tp = void>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2146:3: error: template with C linkage
 2146 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2151:3: error: template with C linkage
 2151 |   template<bool _Cond, typename _Tp = void>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2154:3: error: template with C linkage
 2154 |   template<typename... _Cond>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2159:3: error: template with C linkage
 2159 |   template<bool _Cond, typename _Iftrue, typename _Iffalse>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2164:3: error: template with C linkage
 2164 |   template<typename _Iftrue, typename _Iffalse>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2169:3: error: template with C linkage
 2169 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2174:3: error: template with C linkage
 2174 |   template<typename... _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2181:5: error: template with C linkage
 2181 |     template<typename _Tp, typename _Up>
      |     ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2187:5: error: template with C linkage
 2187 |     template<typename _Tp, typename _Up>
      |     ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2199:5: error: template with C linkage
 2199 |     template<typename, typename>
      |     ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2203:5: error: template with C linkage
 2203 |     template<typename _Tp, typename _Up>
      |     ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2209:3: error: template specialization with C linkage
 2209 |   template<>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2214:3: error: template with C linkage
 2214 |   template<typename _Tp0>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2220:3: error: template with C linkage
 2220 |   template<typename _Tp1, typename _Tp2,
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2229:3: error: template with C linkage
 2229 |   template<typename _Tp1, typename _Tp2>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2239:3: error: template with C linkage
 2239 |   template<typename _Tp1, typename _Tp2>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2244:3: error: template with C linkage
 2244 |   template<typename...>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2248:3: error: template with C linkage
 2248 |   template<typename, typename, typename = void>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2252:3: error: template with C linkage
 2252 |   template<typename _Tp1, typename _Tp2, typename... _Rp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2261:3: error: template with C linkage
 2261 |   template<typename _CTp, typename... _Rp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2268:3: error: template with C linkage
 2268 |   template<typename _CTp, typename _Rp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2272:3: error: template with C linkage
 2272 |   template<typename _Tp, bool = is_enum<_Tp>::value>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2278:3: error: template with C linkage
 2278 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2283:3: error: template with C linkage
 2283 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2288:3: error: template with C linkage
 2288 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2294:3: error: template with C linkage
 2294 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2303:3: error: template with C linkage
 2303 |   template<typename _Signature>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2317:3: error: template with C linkage
 2317 |   template<typename _Tp, typename _Tag>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2324:5: error: template with C linkage
 2324 |     template<typename _Fp, typename _Tp1, typename... _Args>
      |     ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2329:5: error: template with C linkage
 2329 |     template<typename...>
      |     ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2333:3: error: template with C linkage
 2333 |   template<typename _MemPtr, typename _Arg, typename... _Args>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2343:5: error: template with C linkage
 2343 |     template<typename _Fp, typename _Tp1, typename... _Args>
      |     ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2348:5: error: template with C linkage
 2348 |     template<typename...>
      |     ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2352:3: error: template with C linkage
 2352 |   template<typename _MemPtr, typename _Arg, typename... _Args>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2362:5: error: template with C linkage
 2362 |     template<typename _Fp, typename _Tp1>
      |     ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2367:5: error: template with C linkage
 2367 |     template<typename, typename>
      |     ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2371:3: error: template with C linkage
 2371 |   template<typename _MemPtr, typename _Arg>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2381:5: error: template with C linkage
 2381 |     template<typename _Fp, typename _Tp1>
      |     ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2386:5: error: template with C linkage
 2386 |     template<typename, typename>
      |     ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2390:3: error: template with C linkage
 2390 |   template<typename _MemPtr, typename _Arg>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2397:3: error: template with C linkage
 2397 |   template<typename _MemPtr, typename _Arg>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2400:3: error: template with C linkage
 2400 |   template<typename _Res, typename _Class, typename _Arg>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2412:3: error: template with C linkage
 2412 |   template<typename _MemPtr, typename _Arg, typename... _Args>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2415:3: error: template with C linkage
 2415 |   template<typename _Res, typename _Class, typename _Arg, typename... _Args>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2431:3: error: template with C linkage
 2431 |   template<typename _Tp, typename _Up = __remove_cvref_t<_Tp>>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2437:3: error: template with C linkage
 2437 |   template<typename _Tp, typename _Up>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2443:3: error: template with C linkage
 2443 |   template<bool, bool, typename _Functor, typename... _ArgTypes>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2449:3: error: template with C linkage
 2449 |   template<typename _MemPtr, typename _Arg>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2455:3: error: template with C linkage
 2455 |   template<typename _MemPtr, typename _Arg, typename... _Args>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2464:5: error: template with C linkage
 2464 |     template<typename _Fn, typename... _Args>
      |     ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2469:5: error: template with C linkage
 2469 |     template<typename...>
      |     ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2473:3: error: template with C linkage
 2473 |   template<typename _Functor, typename... _ArgTypes>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2481:3: error: template with C linkage
 2481 |   template<typename _Functor, typename... _ArgTypes>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2494:3: error: template with C linkage
 2494 |   template<typename _Functor, typename... _ArgTypes>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2501:3: error: template with C linkage
 2501 |   template<size_t _Len, size_t _Align =
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2505:3: error: template with C linkage
 2505 |   template <size_t _Len, typename... _Types>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2509:3: error: template with C linkage
 2509 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2513:3: error: template with C linkage
 2513 |   template<bool _Cond, typename _Tp = void>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2517:3: error: template with C linkage
 2517 |   template<bool _Cond, typename _Iftrue, typename _Iffalse>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2521:3: error: template with C linkage
 2521 |   template<typename... _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2525:3: error: template with C linkage
 2525 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2529:3: error: template with C linkage
 2529 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2540:3: error: template with C linkage
 2540 |   template<typename _Default, typename _AlwaysVoid,
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2549:3: error: template with C linkage
 2549 |   template<typename _Default, template<typename...> class _Op,
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2558:3: error: template with C linkage
 2558 |   template<typename _Default, template<typename...> class _Op,
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2563:3: error: template with C linkage
 2563 |   template<typename _Default, template<typename...> class _Op,
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2584:3: error: template with C linkage
 2584 |   template <typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2587:3: error: template with C linkage
 2587 |   template <typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2590:3: error: template with C linkage
 2590 |   template<typename... _Elements>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2593:3: error: template with C linkage
 2593 |   template<typename>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2597:3: error: template with C linkage
 2597 |   template<typename... _Tps>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2602:3: error: template with C linkage
 2602 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2607:3: error: template with C linkage
 2607 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2617:3: error: template with C linkage
 2617 |   template<typename _Tp, size_t _Nm>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2629:7: error: template with C linkage
 2629 |       template<typename _Tp, typename
      |       ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2633:7: error: template with C linkage
 2633 |       template<typename>
      |       ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2639:7: error: template with C linkage
 2639 |       template<typename _Tp>
      |       ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2644:7: error: template with C linkage
 2644 |       template<typename>
      |       ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2650:3: error: template with C linkage
 2650 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2657:3: error: template with C linkage
 2657 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2664:3: error: template with C linkage
 2664 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2669:3: error: template with C linkage
 2669 |   template<typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2807:3: error: template with C linkage
 2807 |   template<typename _Result, typename _Ret,
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2812:3: error: template with C linkage
 2812 |   template<typename _Result, typename _Ret>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2822:3: error: template with C linkage
 2822 |   template<typename _Result, typename _Ret>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2849:3: error: template with C linkage
 2849 |   template<typename _Fn, typename... _ArgTypes>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2854:3: error: template with C linkage
 2854 |   template<typename _Fn, typename _Tp, typename... _Args>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2862:3: error: template with C linkage
 2862 |   template<typename _Fn, typename _Tp, typename... _Args>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2869:3: error: template with C linkage
 2869 |   template<typename _Fn, typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2876:3: error: template with C linkage
 2876 |   template<typename _Fn, typename _Tp>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2882:3: error: template with C linkage
 2882 |   template<typename _Fn, typename... _Args>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2888:3: error: template with C linkage
 2888 |   template<typename _Result, typename _Fn, typename... _Args>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2895:3: error: template with C linkage
 2895 |   template<typename _Fn, typename... _Args>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/c++/11/type_traits:2900:3: error: template with C linkage
 2900 |   template<typename _Fn, typename... _Args>
      |   ^~~~~~~~
../src/ui_extra.cpp:31:1: note: ‘extern "C"’ linkage started here
   31 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/champlain-0.12/champlain/champlain-map-source.h:27,
                 from /usr/include/champlain-0.12/champlain/champlain-view.h:29,
                 from /usr/include/champlain-0.12/champlain/champlain.h:41,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:27,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/champlain-0.12/champlain/champlain-tile.h:107:70: warning: ‘GTimeVal’ is deprecated: Use 'GDateTime' instead [-Wdeprecated-declarations]
  107 | const GTimeVal *champlain_tile_get_modified_time (ChamplainTile *self);
      |                                                                      ^
In file included from /usr/include/glib-2.0/glib/galloca.h:32,
                 from /usr/include/glib-2.0/glib.h:30,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/glib-2.0/glib/gtypes.h:545:26: note: declared here
  545 | typedef struct _GTimeVal GTimeVal GLIB_DEPRECATED_TYPE_IN_2_62_FOR(GDateTime);
      |                          ^~~~~~~~
In file included from /usr/include/champlain-0.12/champlain/champlain-map-source.h:27,
                 from /usr/include/champlain-0.12/champlain/champlain-view.h:29,
                 from /usr/include/champlain-0.12/champlain/champlain.h:41,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:27,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/champlain-0.12/champlain/champlain-tile.h:126:25: warning: ‘GTimeVal’ is deprecated: Use 'GDateTime' instead [-Wdeprecated-declarations]
  126 |     const GTimeVal *time);
      |                         ^
In file included from /usr/include/glib-2.0/glib/galloca.h:32,
                 from /usr/include/glib-2.0/glib.h:30,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from /usr/include/champlain-0.12/champlain-gtk/gtk-champlain-embed.h:26,
                 from /usr/include/champlain-0.12/champlain-gtk/champlain-gtk.h:24,
                 from ../src/ui_extra.cpp:33:
/usr/include/glib-2.0/glib/gtypes.h:545:26: note: declared here
  545 | typedef struct _GTimeVal GTimeVal GLIB_DEPRECATED_TYPE_IN_2_62_FOR(GDateTime);
      |                          ^~~~~~~~
[22/42] g++ -Ilifeograph.p -I. -I.. -I/usr/include/gtkmm-3.0 -I/usr/lib64/gtkmm-3.0/include -I/usr/include/giomm-2.4 -I/usr/lib64/giomm-2.4/include -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/sysprof-4 -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/glibmm-2.4 -I/usr/lib64/glibmm-2.4/include -I/usr/include/sigc++-2.0 -I/usr/lib64/sigc++-2.0/include -I/usr/include/gtk-3.0 -I/usr/include/pango-1.0 -I/usr/include/harfbuzz -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/fribidi -I/usr/include/libxml2 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/gio-unix-2.0 -I/usr/include/atk-1.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/dbus-1.0 -I/usr/lib64/dbus-1.0/include -I/usr/include/at-spi-2.0 -I/usr/include/cairomm-1.0 -I/usr/lib64/cairomm-1.0/include -I/usr/include/pangomm-1.4 -I/usr/lib64/pangomm-1.4/include -I/usr/include/atkmm-1.6 -I/usr/lib64/atkmm-1.6/include -I/usr/include/gtk-3.0/unix-print -I/usr/include/gdkmm-3.0 -I/usr/lib64/gdkmm-3.0/include -I/usr/include/enchant-2 -I/usr/include/champlain-0.12 -I/usr/include/clutter-gtk-1.0 -I/usr/include/clutter-1.0 -I/usr/include/cogl -I/usr/include/libdrm -I/usr/include/json-glib-1.0 -I/usr/include/libsoup-2.4 -fdiagnostics-color=always -pipe -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -Wnon-virtual-dtor -std=c++14 -DGETTEXT_PACKAGE=net.sourceforge.Lifeograph -DHAVE_CONFIG_H -O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -pthread -MD -MQ lifeograph.p/src_printing.cpp.o -MF lifeograph.p/src_printing.cpp.o.d -o lifeograph.p/src_printing.cpp.o -c ../src/printing.cpp
[23/42] g++ -Ilifeograph.p -I. -I.. -I/usr/include/gtkmm-3.0 -I/usr/lib64/gtkmm-3.0/include -I/usr/include/giomm-2.4 -I/usr/lib64/giomm-2.4/include -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/sysprof-4 -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/glibmm-2.4 -I/usr/lib64/glibmm-2.4/include -I/usr/include/sigc++-2.0 -I/usr/lib64/sigc++-2.0/include -I/usr/include/gtk-3.0 -I/usr/include/pango-1.0 -I/usr/include/harfbuzz -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/fribidi -I/usr/include/libxml2 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/gio-unix-2.0 -I/usr/include/atk-1.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/dbus-1.0 -I/usr/lib64/dbus-1.0/include -I/usr/include/at-spi-2.0 -I/usr/include/cairomm-1.0 -I/usr/lib64/cairomm-1.0/include -I/usr/include/pangomm-1.4 -I/usr/lib64/pangomm-1.4/include -I/usr/include/atkmm-1.6 -I/usr/lib64/atkmm-1.6/include -I/usr/include/gtk-3.0/unix-print -I/usr/include/gdkmm-3.0 -I/usr/lib64/gdkmm-3.0/include -I/usr/include/enchant-2 -I/usr/include/champlain-0.12 -I/usr/include/clutter-gtk-1.0 -I/usr/include/clutter-1.0 -I/usr/include/cogl -I/usr/include/libdrm -I/usr/include/json-glib-1.0 -I/usr/include/libsoup-2.4 -fdiagnostics-color=always -pipe -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -Wnon-virtual-dtor -std=c++14 -DGETTEXT_PACKAGE=net.sourceforge.Lifeograph -DHAVE_CONFIG_H -O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -pthread -MD -MQ lifeograph.p/src_ui_diary.cpp.o -MF lifeograph.p/src_ui_diary.cpp.o.d -o lifeograph.p/src_ui_diary.cpp.o -c ../src/ui_diary.cpp
[24/42] g++ -Ilifeograph.p -I. -I.. -I/usr/include/gtkmm-3.0 -I/usr/lib64/gtkmm-3.0/include -I/usr/include/giomm-2.4 -I/usr/lib64/giomm-2.4/include -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/sysprof-4 -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/glibmm-2.4 -I/usr/lib64/glibmm-2.4/include -I/usr/include/sigc++-2.0 -I/usr/lib64/sigc++-2.0/include -I/usr/include/gtk-3.0 -I/usr/include/pango-1.0 -I/usr/include/harfbuzz -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/fribidi -I/usr/include/libxml2 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/gio-unix-2.0 -I/usr/include/atk-1.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/dbus-1.0 -I/usr/lib64/dbus-1.0/include -I/usr/include/at-spi-2.0 -I/usr/include/cairomm-1.0 -I/usr/lib64/cairomm-1.0/include -I/usr/include/pangomm-1.4 -I/usr/lib64/pangomm-1.4/include -I/usr/include/atkmm-1.6 -I/usr/lib64/atkmm-1.6/include -I/usr/include/gtk-3.0/unix-print -I/usr/include/gdkmm-3.0 -I/usr/lib64/gdkmm-3.0/include -I/usr/include/enchant-2 -I/usr/include/champlain-0.12 -I/usr/include/clutter-gtk-1.0 -I/usr/include/clutter-1.0 -I/usr/include/cogl -I/usr/include/libdrm -I/usr/include/json-glib-1.0 -I/usr/include/libsoup-2.4 -fdiagnostics-color=always -pipe -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -Wnon-virtual-dtor -std=c++14 -DGETTEXT_PACKAGE=net.sourceforge.Lifeograph -DHAVE_CONFIG_H -O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -pthread -MD -MQ lifeograph.p/src_ui_entry.cpp.o -MF lifeograph.p/src_ui_entry.cpp.o.d -o lifeograph.p/src_ui_entry.cpp.o -c ../src/ui_entry.cpp
[25/42] g++ -Ilifeograph.p -I. -I.. -I/usr/include/gtkmm-3.0 -I/usr/lib64/gtkmm-3.0/include -I/usr/include/giomm-2.4 -I/usr/lib64/giomm-2.4/include -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/sysprof-4 -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/glibmm-2.4 -I/usr/lib64/glibmm-2.4/include -I/usr/include/sigc++-2.0 -I/usr/lib64/sigc++-2.0/include -I/usr/include/gtk-3.0 -I/usr/include/pango-1.0 -I/usr/include/harfbuzz -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/fribidi -I/usr/include/libxml2 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/gio-unix-2.0 -I/usr/include/atk-1.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/dbus-1.0 -I/usr/lib64/dbus-1.0/include -I/usr/include/at-spi-2.0 -I/usr/include/cairomm-1.0 -I/usr/lib64/cairomm-1.0/include -I/usr/include/pangomm-1.4 -I/usr/lib64/pangomm-1.4/include -I/usr/include/atkmm-1.6 -I/usr/lib64/atkmm-1.6/include -I/usr/include/gtk-3.0/unix-print -I/usr/include/gdkmm-3.0 -I/usr/lib64/gdkmm-3.0/include -I/usr/include/enchant-2 -I/usr/include/champlain-0.12 -I/usr/include/clutter-gtk-1.0 -I/usr/include/clutter-1.0 -I/usr/include/cogl -I/usr/include/libdrm -I/usr/include/json-glib-1.0 -I/usr/include/libsoup-2.4 -fdiagnostics-color=always -pipe -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -Wnon-virtual-dtor -std=c++14 -DGETTEXT_PACKAGE=net.sourceforge.Lifeograph -DHAVE_CONFIG_H -O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -pthread -MD -MQ lifeograph.p/src_ui_login.cpp.o -MF lifeograph.p/src_ui_login.cpp.o.d -o lifeograph.p/src_ui_login.cpp.o -c ../src/ui_login.cpp
[26/42] g++ -Ilifeograph.p -I. -I.. -I/usr/include/gtkmm-3.0 -I/usr/lib64/gtkmm-3.0/include -I/usr/include/giomm-2.4 -I/usr/lib64/giomm-2.4/include -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/sysprof-4 -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/glibmm-2.4 -I/usr/lib64/glibmm-2.4/include -I/usr/include/sigc++-2.0 -I/usr/lib64/sigc++-2.0/include -I/usr/include/gtk-3.0 -I/usr/include/pango-1.0 -I/usr/include/harfbuzz -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/fribidi -I/usr/include/libxml2 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/gio-unix-2.0 -I/usr/include/atk-1.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/dbus-1.0 -I/usr/lib64/dbus-1.0/include -I/usr/include/at-spi-2.0 -I/usr/include/cairomm-1.0 -I/usr/lib64/cairomm-1.0/include -I/usr/include/pangomm-1.4 -I/usr/lib64/pangomm-1.4/include -I/usr/include/atkmm-1.6 -I/usr/lib64/atkmm-1.6/include -I/usr/include/gtk-3.0/unix-print -I/usr/include/gdkmm-3.0 -I/usr/lib64/gdkmm-3.0/include -I/usr/include/enchant-2 -I/usr/include/champlain-0.12 -I/usr/include/clutter-gtk-1.0 -I/usr/include/clutter-1.0 -I/usr/include/cogl -I/usr/include/libdrm -I/usr/include/json-glib-1.0 -I/usr/include/libsoup-2.4 -fdiagnostics-color=always -pipe -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -Wnon-virtual-dtor -std=c++14 -DGETTEXT_PACKAGE=net.sourceforge.Lifeograph -DHAVE_CONFIG_H -O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -pthread -MD -MQ lifeograph.p/src_widgets_calendar.cpp.o -MF lifeograph.p/src_widgets_calendar.cpp.o.d -o lifeograph.p/src_widgets_calendar.cpp.o -c ../src/widgets/calendar.cpp
[27/42] g++ -Ilifeograph.p -I. -I.. -I/usr/include/gtkmm-3.0 -I/usr/lib64/gtkmm-3.0/include -I/usr/include/giomm-2.4 -I/usr/lib64/giomm-2.4/include -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/sysprof-4 -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/glibmm-2.4 -I/usr/lib64/glibmm-2.4/include -I/usr/include/sigc++-2.0 -I/usr/lib64/sigc++-2.0/include -I/usr/include/gtk-3.0 -I/usr/include/pango-1.0 -I/usr/include/harfbuzz -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/fribidi -I/usr/include/libxml2 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/gio-unix-2.0 -I/usr/include/atk-1.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/dbus-1.0 -I/usr/lib64/dbus-1.0/include -I/usr/include/at-spi-2.0 -I/usr/include/cairomm-1.0 -I/usr/lib64/cairomm-1.0/include -I/usr/include/pangomm-1.4 -I/usr/lib64/pangomm-1.4/include -I/usr/include/atkmm-1.6 -I/usr/lib64/atkmm-1.6/include -I/usr/include/gtk-3.0/unix-print -I/usr/include/gdkmm-3.0 -I/usr/lib64/gdkmm-3.0/include -I/usr/include/enchant-2 -I/usr/include/champlain-0.12 -I/usr/include/clutter-gtk-1.0 -I/usr/include/clutter-1.0 -I/usr/include/cogl -I/usr/include/libdrm -I/usr/include/json-glib-1.0 -I/usr/include/libsoup-2.4 -fdiagnostics-color=always -pipe -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -Wnon-virtual-dtor -std=c++14 -DGETTEXT_PACKAGE=net.sourceforge.Lifeograph -DHAVE_CONFIG_H -O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -pthread -MD -MQ lifeograph.p/src_widgets_chart_surface.cpp.o -MF lifeograph.p/src_widgets_chart_surface.cpp.o.d -o lifeograph.p/src_widgets_chart_surface.cpp.o -c ../src/widgets/chart_surface.cpp
[28/42] g++ -Ilifeograph.p -I. -I.. -I/usr/include/gtkmm-3.0 -I/usr/lib64/gtkmm-3.0/include -I/usr/include/giomm-2.4 -I/usr/lib64/giomm-2.4/include -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/sysprof-4 -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/glibmm-2.4 -I/usr/lib64/glibmm-2.4/include -I/usr/include/sigc++-2.0 -I/usr/lib64/sigc++-2.0/include -I/usr/include/gtk-3.0 -I/usr/include/pango-1.0 -I/usr/include/harfbuzz -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/fribidi -I/usr/include/libxml2 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/gio-unix-2.0 -I/usr/include/atk-1.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/dbus-1.0 -I/usr/lib64/dbus-1.0/include -I/usr/include/at-spi-2.0 -I/usr/include/cairomm-1.0 -I/usr/lib64/cairomm-1.0/include -I/usr/include/pangomm-1.4 -I/usr/lib64/pangomm-1.4/include -I/usr/include/atkmm-1.6 -I/usr/lib64/atkmm-1.6/include -I/usr/include/gtk-3.0/unix-print -I/usr/include/gdkmm-3.0 -I/usr/lib64/gdkmm-3.0/include -I/usr/include/enchant-2 -I/usr/include/champlain-0.12 -I/usr/include/clutter-gtk-1.0 -I/usr/include/clutter-1.0 -I/usr/include/cogl -I/usr/include/libdrm -I/usr/include/json-glib-1.0 -I/usr/include/libsoup-2.4 -fdiagnostics-color=always -pipe -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -Wnon-virtual-dtor -std=c++14 -DGETTEXT_PACKAGE=net.sourceforge.Lifeograph -DHAVE_CONFIG_H -O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -pthread -MD -MQ lifeograph.p/src_widgets_chart.cpp.o -MF lifeograph.p/src_widgets_chart.cpp.o.d -o lifeograph.p/src_widgets_chart.cpp.o -c ../src/widgets/chart.cpp
ninja: build stopped: subcommand failed.
RPM build errors:
error: Bad exit status from /var/tmp/rpm-tmp.2VZL9o (%build)
    Macro expanded in comment on line 11: %{name}-0.11.1-desktop-file.patch
    Bad exit status from /var/tmp/rpm-tmp.2VZL9o (%build)
Child return code was: 1
EXCEPTION: [Error()]
Traceback (most recent call last):
  File "/usr/lib/python3.9/site-packages/mockbuild/trace_decorator.py", line 93, in trace
    result = func(*args, **kw)
  File "/usr/lib/python3.9/site-packages/mockbuild/util.py", line 600, in do_with_status
    raise exception.Error("Command failed: \n # %s\n%s" % (command, output), child.returncode)
mockbuild.exception.Error: Command failed: 
 # bash --login -c /usr/bin/rpmbuild -bb --target x86_64 --nodeps /builddir/build/SPECS/lifeograph.spec