host user # emerge -uvaD xorg-x11

These are the packages that would be merged, in order:

Calculating dependencies /
!!! All ebuilds that could satisfy ">=x11-base/xorg-server-1.0.99" have been masked.
!!! One of the following masked packages is required to complete your request:
- x11-base/xorg-server-1.1.0-r1 (masked by: package.mask)

For more information, see MASKED PACKAGES section in the emerge man page or
refer to the Gentoo Handbook.
(dependency required by "x11-drivers/xf86-video-nv-1.1.2" [ebuild])