safe to delete /usr/local/lib/compat/pkg libs

[Nicolas Blais]

Hi,

When I update using portupgrade, sometimes replaced libs are sent 
to /usr/local/lib/compat/pkg, for backward compatibility I presume. 

My question is, how do I know if librairies in that folder are safe to delete? 
I checked today, and there are libs that are 8 months old which I assume 
aren't used since a newer version exists in /usr/local/lib and I always keep 
my system up to date, compiling from source.

Thanks,
Nicolas.
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