Please test and add amd64 to the KEYWORDS on games-q3mod.eclass and add an "amd64? ( app-emulation/emul-linux-x86-baselibs )" to RDEPEND. There have been numerous reports of this working, and I just figure we might as well make it official if it works.
Done. Added (X and am64)-dependant app-emulation/emul-linux-x86-xlibs to RDEPEND.