While I have been using Gentoo linux for a while now, I recently found out that it has the ability to dynamically create ebuilds (the gentoo package format) for perl modules. No more worrying about "polluting" your system with non-ebuild files, or trying to make your own! Just run:
host# g-cpan.pl Perl::ModuleNameAnd watch as it is created and installed for you, with any dependancies, automagically! You can then remove it and manage it with Portage just like all your other ebuild packages.