quanta src # emerge =kde-base/kdelibs-3.5.8
 * Overlay eclasses override eclasses from PORTDIR:
 * 
 *   '/usr/portage/local/layman/kde/eclass/kde4-base.eclass'
 *   '/usr/portage/local/layman/kde/eclass/kde4-functions.eclass'
 *   '/usr/portage/local/layman/kde/eclass/kde4-meta.eclass'
 * 
 * It is best to avoid overridding eclasses from PORTDIR because it will
 * trigger invalidation of cached ebuild metadata that is distributed with
 * the portage tree. If you must override eclasses from PORTDIR then you
 * are advised to run `emerge --regen` after each time that you run `emerge
 * --sync`. Set PORTAGE_ECLASS_WARNING_ENABLE="0" in /etc/make.conf if you
 * would like to disable this warning.

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

Calculating dependencies \
!!! All ebuilds that could satisfy "=kde-base/kdelibs-3.5.8" have been masked.
!!! One of the following masked packages is required to complete your request:
- kde-base/kdelibs-3.5.8 (masked by: )

For more information, see MASKED PACKAGES section in the emerge man page or 
refer to the Gentoo Handbook.