I'm not a Perl programmer so I'm not too sure. Your best bets are going to be Perl.org or cpan.org for Perl related help. Because Perl is a default system language on Linux (similar to how C and C++ are default languages on Windows), chances are Perl is not messed up, but due to your upgrades, you may have messed up some Apache configuration files that connect into Perl. What all did you upgrade?