emerge -av kiba-dock

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

Calculating dependencies |
!!! All ebuilds that could satisfy "kiba-dock" have been masked.
!!! One of the following masked packages is required to complete your request:
- gnome-extra/kiba-dock-9999 (masked by: missing keyword)

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