I had a little time to study one of my favorite Perl too: perlbrew.
While reading the source code I decided to add a little extra-information on the output of the available command. Such command provides the list of available (i.e., downloadable) Perl versions, but not from where it is going to download them.
Therefore I applied a patch to show to the outer world the donadloadable links.
And after a few days and a little embarassement for a forgotten failing test, it has been merged!