[gentoo-user] Prevent depclean from removing Python-2.6?

[Grant Edwards]

I ran emerge --depclean the other day on one of my machines and it
removed Python 2.6.  I was using Python 2.6 as my "default" python,
and depclean's removal of it broke a _lot_ of stuff.  About a half
day's worth of hassle later I had Python 2.6 re-installed and my
system was again usable.

In order to avoid the same circus on my other machines, how do I
prevent emerge --depclean from removing Python 2.6?

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