Created attachment 330102 [details, diff] patch to handle GLES3 headers Necessary for Mesa's upcoming February release. It'd be nice to not get blocked by eselect-opengl again.
I think lu_zero maintains this? I want to get this patch committed ASAP.
Pushed: http://git.overlays.gentoo.org/gitweb/?p=proj/eselect.git;a=commit;h=1ba301aeae25c8284538d00671ff0bd6c9528925
Version bump 1.2.7 now in the tree.