linux ~ # emerge kcontrol -pv

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

Calculating dependencies |
!!! All ebuilds that could satisfy "kcontrol" have been masked.
!!! One of the following masked packages is required to complete your request:
- kde-base/kcontrol-3.5.5 (masked by: )
- kde-base/kcontrol-3.5.6 (masked by: )
- kde-base/kcontrol-3.5.6-r1 (masked by: )
- kde-base/kcontrol-3.5.7 (masked by: )
- kde-base/kcontrol-3.5.7-r1 (masked by: )
- kde-base/kcontrol-3.5.8 (masked by: )

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