Product: Fedora https://bugzilla.redhat.com/show_bug.cgi?id=907703
--- Comment #1 from Steven Roberts strobert@strobe.net --- I did some searching. found this: https://bugzilla.redhat.com/show_bug.cgi?id=562316#c2
so looks like that is why PERL_INSTALL_ROOT was the old default.
I'm working with the cpanspec upstream. And actually this change looks to be in a set a user has submitted for the next version.