Currently, lack of libxt-dev at build time leads to the following error (only relevant error copied):
../WebCore/plugins/gtk/gtk2xtbin.h:44:27: error: X11/Intrinsic.h: No such file or directory
A check should be added to the configure script.
I think this is a duplicate to bug 19045.
*** This bug has been marked as a duplicate of 19045 ***