This is weird. When doing:
emerge -auDU @world
Portage says:
============
!!! Problems have been detected with your world file
!!! Please run emaint --check world
!!! Ebuilds for the following packages are either all
!!! masked or don't exist:
media-sound/pavucontrol media-sound/pulseeffects sys-block/gparted
Nothing to merge; quitting.
============
My world file is fine and "emaint --check world" doesn't find anything.
Also, all these packages that portage claims are masked or don't exist
are not masked and they exist.
This is on ~amd64.
I'm stumped :-/