localhost khronus # emerge mplayer-bin
--- Invalid atom in /etc/portage/package.keywords: media-libs/win32codecs-20060611
Calculating dependencies -
!!! All ebuilds that could satisfy ">=media-libs/win32codecs-20050412" have been masked.
!!! One of the following masked packages is required to complete your request:
- media-libs/win32codecs-20060611 (masked by: ~amd64 keyword)

For more information, see MASKED PACKAGES section in the emerge man page or
refer to the Gentoo Handbook.
(dependency required by "media-video/mplayer-bin-1.0_pre8" [ebuild])