While I can't answer that, I might try to actually call a Perl check after which although slightly extra work would yield the answer.
Hmmm, good point - I could do that. I've come across several methods of checking module versions and none of them seemed "perfect" to me. Can you recommend a method?
You installing these locally in a non root users home? :)
If not, I can tell you that will wreak havoc if a Perl related updated comes down the pipe via yum...
We don't do auto-updates on production boxes so this is not a concern. And yeah, my other alternative would be to do it all via yum instead of CPAN, but that would be a massive change to the system I've inherited.