>>> Waiting 5 seconds before starting...
>>> (Control-C to abort)...
>>> Unmerging in: 5 4 3 2 1 
>>> Unmerging xfce-base/xfce4-panel-4.4.0_rc2...
No package files given... Grabbing a set.

!!! ERROR: xfce-base/xfce4-panel-4.4.0_rc2 failed.
Call stack:
  ebuild.sh, line 1454:   Called source '/var/db/pkg/xfce-base/xfce4-panel-4.4.0_rc2/xfce4-panel-4.4.0_rc2.ebuild'
  xfce4-panel-4.4.0_rc2.ebuild, line 5:   Called inherit 'xfce'
  ebuild.sh, line 1189:   Called die

!!! xfce.eclass could not be found by inherit()
!!! If you need support, post the topmost build error, and the call stack if relevant.

!!! FAILED prerm: 1