bash-2.05b# emerge -Duva --newuse world

These are the packages that I would merge, in order:

Calculating world dependencies \
!!! All ebuilds that could satisfy ">=sys-libs/pam-0.78" have been masked.
!!! One of the following masked packages is required to complete your request:
- sys-libs/pam-0.78-r1 (masked by: ~x86 keyword)
- sys-libs/pam-0.78-r2 (masked by: ~x86 keyword)
- sys-libs/pam-0.78 (masked by: ~x86 keyword)

For more information, see MASKED PACKAGES section in the emerge man page or 
section 2.2 "Software Availability" in the Gentoo Handbook.
!!!    (dependency required by "kde-base/kdebase-pam-5" [ebuild])


!!! Problem with ebuild kde-base/kdebase-startkde-3.4.1
!!! Possibly a DEPEND/*DEPEND problem.

!!! Depgraph creation failed.