x11-proto/xf86vidmodeproto-2.3 renamed xf86vmode.h to xf86vm.h media-libs/mesa-7.6 still uses the old name, and thus doesn't compile. Either a blocker should be added or it should be patched. Reproducible: Always Steps to Reproduce:
xf86vidmodeproto-2.3 is under package.mask precisely because those protos and libs break a lot of packages. Don't unmask 2.3 yet. Thanks