host user # emerge --update --ask world

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

Calculating world dependencies \
!!! All ebuilds that could satisfy ">=media-libs/mesa-6.5-r2" have been masked.
!!! One of the following masked packages is required to complete your request:
- media-libs/mesa-6.5-r3 (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-base/xorg-server-1.1.0-r1" [ebuild])



!!! Problem resolving dependencies for x11-drivers/xf86-video-nv
!!! Depgraph creation failed.