Some versions of OS X (Lion for instance) ship with multiple versions of perl installed, and with every perl utility available as utility#.## (eg pod2man5.12). This is actually documented in the perl(1) man page.

There is also an unexecutable script with the utility name, no version suffix, which can be run with perlutility which emits a message about the multiversion support.

Instead of setting the executable bit on those scripts, replace them with an alias to the version you want (eg: rm /usr/bin/pod2man; ln -s /usr/bin/pod2man5.12 /usr/bin/pod2man. You may also need to change the permissions of the alias (eg: chmod -h o+rx /usr/bin/pod2man). Plus it goes without saying that you'll need to do all of this with admin permissions.

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