I don't know of any open source products to automate the conversion, though there may be somthing on CPAN.
As I recall I had a shell script of about 30 lines long that ran a find to get all the .packlist files, then used xargs etc to feed the list of filenames into tar in order to create a big tarball of all the perl files needed. The tarball was then unpacked into skeleton debian package directory (With a pre-prepared DEBIAN/control file). and the necessary debian specific command was run to turn the whole thing into a debian package that would unpack everything into the same locations on another server. I have probably foggotten a few details, and the process probably breaks the debian packaging policy in lots of ways, but it was a quick and dirty solution so who cares.
