Suggestion made by Craig Lawson through e-mail: The installation instructions should tell the users to set the VIDEO_CARDS variable (based on the IUSE_VIDEO_CARDS in xfree-drm ebuild) if the user needs to use xfree-drm.
Should prolly get lines added to make.conf.example about it, really.
Why not throw in LINGUAS while we're at it?
Isn't that for desktop rather than installation? I don't know any ebuilds that requires LINGUAS to be set that is referenced in the installation instructions.
I've added an extra line to the xfree-drm explanation that the user should check the IUSE_VIDEO_CARDS variable in the xfree-drm ebuilds to see what he/she needs to fill in. I'm marking this one as FIXED.