The package installed without difficulty for me as well. I had an impressive number of dependencies that needed to be handled first, and I happened to notice that at least one of them tested for the presence of a C compiler. This is not necessarily a given for all macosx users.

It's unlikely but possible that someone might try to do a CPAN install before having installed the XCode SDK from the macosx distro -- it's easy to do, and I'd expect that all typical Perl users with macs have done it, but it's a non-default choice.