Calculating dependencies /
!!! All ebuilds that could satisfy "x11-libs/libX11" have been masked.
!!! One of the following masked packages is required to complete your request:
- x11-libs/libX11-1.0.1-r1 (masked by: ~x86 keyword)

For more information, see MASKED PACKAGES section in the emerge man page or
refer to the Gentoo Handbook.
(dependency required by "media-libs/mesa-6.5.1_alpha20060614" [binary])