a ~ # emerge --update --deep --newuse -av world

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

Calculating world dependencies \
!!! All ebuilds that could satisfy "=net-www/apache-2*" have been masked.
!!! One of the following masked packages is required to complete your request:
- net-www/apache-2.0.58-r2 (masked by: package.mask)
- net-www/apache-2.0.59-r2 (masked by: package.mask)
- net-www/apache-2.2.4-r7 (masked by: package.mask)
- net-www/apache-2.2.4-r6 (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 "dev-lang/php-5.2.2-r1" [installed])



!!! Problem resolving dependencies for dev-lang/php
!!! Depgraph creation failed.