>> My take is to purge old libs after every new release.  Once, I had to do
>> it in the middle of a version upgrade, because there was no space left
>> on disk to complete it.  My fault only, I had a very tight custom
>> partitioning layout.
>
> I don't think it's that easy.  One case it comes to mind it's that
> there's a short window after an update and between `pkg_add -u` where
> you're running a new system but with old ports.  Your entire system
> (except base stuff) would break if you remove the libraries.  There may
> be more edge cases like this.

If you use packages rather than self-built software from outside
of ports/packages, sysclean already takes care of this when suggesting
what to remove.


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