Dear all,

Still in the process of improving my solver (and make it a usable tool), I need 
to have a better idea on how installed packages should be managed.
I didn't find anything on that topic in the PMS (if I've missed it, I'm sorry).
Could you confirm/correct my following understanding:
 1. installed packages that are still in the portage tree can be 
unmerged/updated without any restriction (as specified in their .ebuild)
 2. installed packages that are not in the portage tree can only be kept as is 
or unmerged
 3. before removing a library, "ebuild unmerge" always checks if it is used by 
another package: this means that installed packages' dependencies are never 

Many thanks!

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