http://www.perlmonks.org?node_id=1020326


in reply to Re^2: Which takes priority site\lib or lib?
in thread Which takes priority site\lib or lib?

So they silently broke older installs

Well, old installations usually don't magically get a new perl. When installing a new major version of perl 5, it's a good idea to re-install all dependent modules anyway.

And it wasn't without warning either. To quote perl5120delta:

In @INC, ARCHLIB and PRIVLIB now occur after after the current version's site_perl and vendor_perl. Modules installed into site_perl>and vendor_perl will now be loaded in preference to those installed in ARCHLIB and PRIVLIB.