I've done similar to Mark, but slightly different.

# # back up your system
# emerge -DuvaN world # make sure u're up-to-date
# vi /etc/make.conf ; vi /etc/portage/package.use # edit your USE flags
# emerge -DuvaN # update to new USE flags
# cp -a /var/lib/portage/world ~/ # backup world file
# vi /var/lib/portage/world # remove whatever u don't want
# emerge -va --depclean # make sure you don't remove anything critical
# emerge -DuvaN world # ideally, u should get nothing
# revdep-rebuild -i # fix broken linkages

Last two may need to be repeating, as you may find you need to tune your
USE flags.

Depending on your requirements, it may save time just to re-install.

--
Albert W. Hopkins

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