it seems to me something's broken with (at least) revision 10549 and libwpg-0.2

I have all the header files but still get this:

x86_64-pc-linux-gnu-g++ -DHAVE_CONFIG_H -I. -I..   -I/usr/include/freetype2   -fopenmp -I/usr/include/ImageMagick    -I/usr/include/libwpg-0.2 -I/usr/include/libwpd-0.9      -I/usr/include/poppler   -D_REENTRANT -DQT_SHARED -pthread -I/usr/include/poppler/glib -I/usr/include/poppler -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/cairo -I/usr/include/gtk-2.0 -I/usr/lib64/gtk-2.0/include -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/directfb -I/usr/include/libpng14 -I/usr/include/qt4 -I/usr/include/qt4/QtGui -I/usr/include/libdrm -I/usr/include/qt4/QtCore -I/usr/include/pango-1.0   -DPOTRACE=\"potrace\" -pthread -D_REENTRANT -DQT_SHARED -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/gtk-2.0 -I/usr/lib64/gtk-2.0/include -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/pango-1.0 -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/directfb -I/usr/include/libpng14 -I/usr/include/qt4 -I/usr/include/qt4/QtGui -I/usr/include/libdrm -I/usr/include/qt4/QtCore -I/usr/include/libxml2 -I/usr/include/sigc++-2.0 -I/usr/lib64/sigc++-2.0/include -I/usr/include/gtkspell-2.0 -I/usr/include/glibmm-2.4 -I/usr/lib64/glibmm-2.4/include -I/usr/include/giomm-2.4 -I/usr/lib64/giomm-2.4/include -I/usr/include/gdkmm-2.4 -I/usr/lib64/gdkmm-2.4/include -I/usr/include/pangomm-1.4 -I/usr/lib64/pangomm-1.4/include -I/usr/include/cairomm-1.0 -I/usr/lib64/cairomm-1.0/include -I/usr/include/gtkmm-2.4 -I/usr/lib64/gtkmm-2.4/include -I/usr/include/atkmm-1.6 -I/usr/include/gtk-unix-print-2.0   -I../cxxtest  -I./bind/javainc -I./bind/javainc/linux -I./extension/dbus   -Werror=format-security -Wall -Wformat -Wformat-security -W -D_FORTIFY_SOURCE=2   -Wpointer-arith -Wcast-align -Wsign-compare -Woverloaded-virtual -Wswitch -Wno-unused-parameter -O2 -march=core2 -msse4.1 --param l1-cache-size=32 --param l1-cache-line-size=64 --param l2-cache-size=6144 -fomit-frame-pointer -pipe -fno-strict-aliasing -fopenmp -c -o extension/internal/bitmap/imagemagick.o extension/internal/bitmap/imagemagick.cpp
extension/internal/wpg-input.cpp:59:44: error: libwpg/WPGStreamImplementation.h: No such file or directory

that's because there is no WPGStreamImplementation.h in libwpg-0.2; i can only see it in libwpg-0.1;
I cross checked with debian, as the OP reports it's working there, but it's clear from
http://packages.debian.org/sid/amd64/libwpg-dev/filelist
that there is no such file in libwpg-0.2;

I am on an up2date Gentoo box and these are the files I have for libwpg:
blackknight ~ # equery f libwpg
 * Searching for libwpg ...
 * Contents of app-text/libwpg-0.1.3:
/usr
/usr/bin
/usr/bin/wpg2raw
/usr/bin/wpg2svg
/usr/bin/wpg2svgbatch.pl
/usr/include
/usr/include/libwpg-0.1
/usr/include/libwpg-0.1/libwpg
/usr/include/libwpg-0.1/libwpg/WPGBinaryData.h
/usr/include/libwpg-0.1/libwpg/WPGBitmap.h
/usr/include/libwpg-0.1/libwpg/WPGBrush.h
/usr/include/libwpg-0.1/libwpg/WPGColor.h
/usr/include/libwpg-0.1/libwpg/WPGGradient.h
/usr/include/libwpg-0.1/libwpg/WPGPaintInterface.h
/usr/include/libwpg-0.1/libwpg/WPGPath.h
/usr/include/libwpg-0.1/libwpg/WPGPen.h
/usr/include/libwpg-0.1/libwpg/WPGPoint.h
/usr/include/libwpg-0.1/libwpg/WPGRect.h
/usr/include/libwpg-0.1/libwpg/WPGStreamImplementation.h
/usr/include/libwpg-0.1/libwpg/WPGString.h
/usr/include/libwpg-0.1/libwpg/WPGraphics.h
/usr/include/libwpg-0.1/libwpg/libwpg.h
/usr/lib64
/usr/lib64/libwpg-0.1.la
/usr/lib64/libwpg-0.1.so -> libwpg-0.1.so.1.0.3
/usr/lib64/libwpg-0.1.so.1 -> libwpg-0.1.so.1.0.3
/usr/lib64/libwpg-0.1.so.1.0.3
/usr/lib64/libwpg-stream-0.1.la
/usr/lib64/libwpg-stream-0.1.so -> libwpg-stream-0.1.so.1.0.3
/usr/lib64/libwpg-stream-0.1.so.1 -> libwpg-stream-0.1.so.1.0.3
/usr/lib64/libwpg-stream-0.1.so.1.0.3
/usr/lib64/pkgconfig
/usr/lib64/pkgconfig/libwpg-0.1.pc
/usr/lib64/pkgconfig/libwpg-stream-0.1.pc
 * Contents of app-text/libwpg-0.2.0-r1:
/usr
/usr/bin
/usr/bin/wpg2raw-0.2
/usr/bin/wpg2svg-0.2
/usr/bin/wpg2svgbatch.pl-0.2
/usr/include
/usr/include/libwpg-0.2
/usr/include/libwpg-0.2/libwpg
/usr/include/libwpg-0.2/libwpg/WPGPaintInterface.h
/usr/include/libwpg-0.2/libwpg/WPGraphics.h
/usr/include/libwpg-0.2/libwpg/libwpg.h
/usr/lib64
/usr/lib64/libwpg-0.2.so -> libwpg-0.2.so.2.0.0
/usr/lib64/libwpg-0.2.so.2 -> libwpg-0.2.so.2.0.0
/usr/lib64/libwpg-0.2.so.2.0.0
/usr/lib64/pkgconfig
/usr/lib64/pkgconfig/libwpg-0.2.pc
/usr/share
/usr/share/doc
/usr/share/doc/libwpg-0.2.0-r1
/usr/share/doc/libwpg-0.2.0-r1/AUTHORS.bz2
/usr/share/doc/libwpg-0.2.0-r1/ChangeLog.bz2
/usr/share/doc/libwpg-0.2.0-r1/NEWS.bz2