As per the test-rebuild of wily [1] the mir package seems to fail on amd64, armhf and i386 due to the following error:
[ 14%] Building CXX object src/platforms/mesa/server/kms/CMakeFiles/mirplatformgraphicsmesakmsobjects.dir/linux_virtual_terminal.cpp.o
cd /«BUILDDIR»/mir-0.16.0+15.10.20150921.1/obj-x86_64-linux-gnu/src/platforms/mesa/server/kms && /usr/bin/x86_64-linux-gnu-g++ -DLOG_NDEBUG=1 -DMESA_EGL_NO_X11_HEADERS -DMIR_VERSION_MAJOR=0 -DMIR_VERSION_MICRO=0 -DMIR_VERSION_MINOR=16 -D__GBM__ -g -O2 -fstack-protector-strong -Wformat -Werror=format-security -D_FORTIFY_SOURCE=2 -pthread -g -std=c++14 -Werror -Wall -fno-strict-aliasing -Wnon-virtual-dtor -Wextra -fPIC -I/«BUILDDIR»/mir-0.16.0+15.10.20150921.1/include/common -I/«BUILDDIR»/mir-0.16.0+15.10.20150921.1/include/platforms/mesa -I/«BUILDDIR»/mir-0.16.0+15.10.20150921.1/include/platform -I/«BUILDDIR»/mir-0.16.0+15.10.20150921.1/include/renderers/gl -I/«BUILDDIR»/mir-0.16.0+15.10.20150921.1/src/include/common -I/«BUILDDIR»/mir-0.16.0+15.10.20150921.1/src/include/platform -I/«BUILDDIR»/mir-0.16.0+15.10.20150921.1/src/platforms/mesa/server/common -I/usr/include/libdrm -o CMakeFiles/mirplatformgraphicsmesakmsobjects.dir/linux_virtual_terminal.cpp.o -c /«BUILDDIR»/mir-0.16.0+15.10.20150921.1/src/platforms/mesa/server/kms/linux_virtual_terminal.cpp
In file included from /usr/include/EGL/egl.h:39:0,
from /«BUILDDIR»/mir-0.16.0+15.10.20150921.1/include/platform/mir/graphics/platform.h:24,
from /«BUILDDIR»/mir-0.16.0+15.10.20150921.1/src/platforms/android/server/platform.h:22,
from /«BUILDDIR»/mir-0.16.0+15.10.20150921.1/src/platforms/android/server/platform.cpp:20:
/usr/include/EGL/eglplatform.h:100:35: fatal error: android/native_window.h: No such file or directory
compilation terminated.
[1] http://people.ubuntuwire.org/~wgrant/rebuild-ftbfs-test/test-rebuild-20151001-wily.html#core
It looks like this got fixed in the next mir release that landed in the overlay PPA (mir 0.16.1+ 15.10.20150930. 1). Will have to see if we can safely copy-package this version, or maybe we'll just distro-patch it quickly to fix the build failure.