"--depclean" sollte man aber mit vorsicht geniessen...
depclean
Determines all packages installed on the system that have no
explicit reason for being there. emerge generates a list of
packages which it expects to be installed by checking the system
package list and the world file. It then compares that list to
the list of packages which are actually installed; the differ-
ences are listed as unnecessary packages and are suggested for
unmerging. WARNING: Removing some packages may cause packages
which link to the removed package to stop working and complain
about missing libraries. Re-emerge the complaining package to
fix this issue. Note that changes in USE flags can drastically
affect the output of depclean.
es kann nämlich passieren, dass da pakete deinstalliert werden, die man nich unbedingt deinstallieren sollte/möchte...
Ne Alternative wäre noch das kleine programm
dep-clean aus dem
gentoolkit
NAME
dep-clean - Gentoo: Shows unrequired packages and missing dependencies.
SYNOPSIS
dep-clean [-RUNICv]
DESCRIPTION
dep-clean displays extraneous, missing or extra packages. Extra pack-
ages are those in which are not a part of the portage tree
(/usr/portage). It does NOT modify the system in any way.