On one hand, it's desirable to have a clean portage tree when doing
emerge --world update
But, on the other hand, you may have some old ebuilds you want to keep, or maybe
you have your own custom ebuilds that you want to keep.
Thus, what about making
emerge --clean rsync
instead of removing the old ebuilds, moving them somewhere else for safekeeping.
Then we could use another option, like --purge to actually delete them.
--purge would work exactly the same way as --clean currently works.
This idea belongs to userwaldo, but since he's too sleepy to file it, I'm filing
Um, we recommend anonymous cvs rather than rsync for people who tweak their
files. I think this is the way to go.