Hi, In the pkg-config files( /usr/lib/pkgconfig/gl.pc etc.), the prefix is set as "/home/jan/svn/........." It is a local path of the computer of <jgc at archlinux.org> . I dare say that is wrong! When I run "pkg-config gl --cflags", it told me that wrong path. Would you re-make the packages(mesa libgl) ? Cheers!