How to customize which perl perldb uses?

[KKramsch]

The default version of perl that my ISP uses is the decrepit 5.005,
even though various 5.6.x and 5.8.x versions are installed and
available to users.  When I run perldb, however, Emacs uses the
default v. 5.005, which limits this perldb to debugging only ancient
Perl code.

How can I customize which version of Perl Emacs uses for perldb?

Thanks!

        Karl
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