I already posted this here 442242 answering a similar question

The CPAN autobundle can be used to ease perl upgrades, by creating a special bundle containing all the installed modules of the current version of perl. This bundle can then be installed once the new version of perl is installed.


cpan> autobundle

Wrote bundle file -> /var/spool/cpan/Bundle/Snapshot_2010_8_01_00.pm

cpan> quit

# upgrade perl here …

cpan> install Bundle::Snapshot_2010_8_01_00