I'm trying to build 2.10.3 on a slackware box under the old garnome build system (I've being doing this for years). The build dies as shown in the log below. Pixman exists on my machine and without an nonstandard environment values seems to be found; i.e., pkg-config --modversion pixman-1 0.33.1 echo $PKG_CONFIG_PATH /usr/local/lib64/pkgconfig:/usr/local/lib/pkgconfig:/usr/lib64/pkgconfig:/usr/lib/pkgconfig:/usr/share/pkgconfig Here's the full log: [ 97%] Generating ../../WebKit2-4.0.gir Package pixman-1 was not found in the pkg-config search path. Perhaps you should add the directory containing `pixman-1.pc' to the PKG_CONFIG_PATH environment variable Package 'pixman-1', required by 'cairo', not found /opt/garnome-3.18.2/lib/gio/modules/libgioremote-volume-monitor.so: undefined symbol: g_vfs_monitor_implementation_free Failed to load module: /opt/garnome-3.18.2/lib/gio/modules/libgioremote-volume-monitor.so In file included from /tmp/g-ir-cpp-Dm3YAn.c:4:0: /home/ronis/Project/notar/GNOME/garnome/platform/webkitgtk+/work/main.d/webkitgtk-2.10.3/build/DerivedSources/webkit2gtk/webkit2/WebKitEnumTypes.h:30:25: fatal error: glib-object.h: No such file or directory compilation terminated. Caught exception: <class 'distutils.errors.CompileError'> CompileError(DistutilsExecError("command '/usr/bin/gcc' failed with exit status 1",),) [?1034h> /usr/lib/python2.7/distutils/unixccompiler.py(111)preprocess() -> raise CompileError, msg (Pdb) make[2]: *** [WebKit2-4.0.gir] Error 1 make[2]: Leaving directory `/home/ronis/Project/notar/GNOME/garnome/platform/webkitgtk+/work/main.d/webkitgtk-2.10.3/build' make[1]: *** [Source/WebKit2/CMakeFiles/WebKit2WebExtension-4-gir.dir/all] Error 2 make[1]: Leaving directory `/home/ronis/Project/notar/GNOME/garnome/platform/webkitgtk+/work/main.d/webkitgtk-2.10.3/build' make: *** [all] Error 2 make: Leaving directory `/home/ronis/Project/notar/GNOME/garnome/platform/webkitgtk+/work/main.d/webkitgtk-2.10.3/build' make: *** [install-work/main.d/webkitgtk-2.10.3/Makefile] Error 2