GTK and EFL port of WebKit requires a version of cairo that is built with fontconfig support. Make sure fontconfig is marked as a dependency for cairo. In my build environment cairo was built first (before fontconfig). This meant that cairo was built without fontconfig support, which than meant that WebKit build failed.
Created attachment 165504 [details] 1st try Fixes the build for me..
Comment on attachment 165504 [details] 1st try Clearing flags on attachment: 165504 Committed r129449: <http://trac.webkit.org/changeset/129449>
All reviewed patches have been landed. Closing bug.