The USE flag glamor for x11-base/xorg-server is profile masked in base/package.use.mask with the above message: # Chí-Thanh Christopher Nguyễn <chithanh@gentoo.org> (05 Jun 2014) # Needs libepoxy keywording, bug #510940 However, that is already keyworded on many architectures for wayland support. Please move this from base profile to arch profiles that still do not have a version keyworded. Reproducible: Always
It's unmasked for x86 and amd64. That's probably sufficient.