chaza@Mars ~ $ sudo emerge -av --depclean
*** WARNING *** Depclean may break link level dependencies. Thus, it is
*** WARNING *** recommended to use a tool such as `revdep-rebuild` (from
*** WARNING *** app-portage/gentoolkit) in order to detect such breakage.
*** WARNING ***
*** WARNING *** Also study the list of packages to be cleaned for any obvious
*** WARNING *** mistakes. Packages that are part of the world set will always
*** WARNING *** be kept. They can be manually added to this set with
*** WARNING *** `emerge --noreplace <atom>`.
*** WARNING ***
*** WARNING *** As a safety measure, depclean will not remove any packages
*** WARNING *** unless *all* required dependencies have been resolved. As a
*** WARNING *** consequence, it is often necessary to run
*** WARNING *** `emerge --update --deep world` prior to depclean.
Calculating dependencies ... done!
Dependencies could not be completely resolved due to
the following required packages not being installed:
>=media-libs/x264-svn-20061014 required by media-libs/libquicktime-0.9.9-r1
Have you forgotten to run `emerge --update --deep world` prior to depclean?
chaza@Mars ~ $ sudo emerge -tavuD world
These are the packages that would be merged, in reverse order:
Calculating world dependencies I
!!! Ebuilds for the following packages are either all
!!! masked or don't exist:
www-apps/phpBB app-cdr/simplecdrx
... done!
Total size of downloads: 0 kB
Nothing to merge; would you like to auto-clean packages? [Yes/No]
Exiting on signal 2