emerge -uDtpv world
These are the packages that would be merged, in reverse order:
Calculating world dependencies \
!!! All ebuilds that could satisfy ">=x11-libs/libdrm-2.2" have been masked.
!!! One of the following masked packages is required to complete your request:
- x11-libs/libdrm-2.3.0 (masked by: package.mask)
# Need wxGTK 2.8 with GTK 2.10
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-r4" [ebuild])
!!! Problem resolving dependencies for gnome-base/gconf
!!! Depgraph creation failed.