CPAN libraries are version-specific

This is a gross overstatement. Few are version specific unless we're talking about <= 5.6 and that would be ludicrous to discuss in this context in 2015.

In a properly “hardened” production environment, you will not be able to install the packages that you need,

Also overstated. It depends entirely upon your build system.

In reply to Re^2: targetting for multiple perl versions by Your Mother
in thread targetting for multiple perl versions by bagyi

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