Honestly, I have no idea why perlbrew team decided to not patch cpanm in the way you describe. Maybe it was hard enough to patch it to work with perlbrew at all (mind you, the default cpanm doesn't).

In reply to Re^3: perlbrew uses ~/.cpanm/ - why's that then? by Dallaylaen
in thread perlbrew uses ~/.cpanm/ - why's that then? by Caesura

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