It's much easier to put your script in a distribution and list its prerequisites in the usual way. When the user wants to install it, the prereqs get installed automatically.

In the Makefile.PL, you end up with something like:

# ... set some values

WriteMakefile(
        'NAME'      => $script_name,
        'VERSION'   => $version,
        'EXE_FILES' => [ $script_name ],

        'PREREQ_PM' => {
                'Test::More' => '0',
                #... et cetera
                },

        'MAN1PODS'  => {
                $script_name => "\$(INST_MAN1DIR)/$script_name.1",
                },
        );
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