are you starting out by typing(*):
(*)if so, 1) is it saying the command perl is not found? (normally in /usr/bin. Check your path) OR
2) is it saying the Module CPAN is not found?
(*)if not, please post your input that is failing.
BTW you can always do a search on www.cpan.org
for the module you need, download it directly, and build it locally.