Could you please somehow make the ebuild for media-libs/mesa-7.3 only inherit git when the ebuild will fetch its source from git? Currently the ebuilds "breaks" live-rebuild tools like update-live-ebuilds or portage-2.2s "emerge @live-rebuild" as they all look in the inherit, sees git and decides that mesa-7.3 should be recompiled.
Re-assigning to you Donnie, your bump, though this about an overlay. Resolve as you see fit.
Forgot to remove the ebuild from the overlay. Done, thanks.