perl versions

[Declan Grady]

Hi,
RedHat 7.0+MailScanner+F-prot+spamassassin

In trying to upgrade to 4.28-4, requiring Archive::Zip, my perl 5.6.0 decided
it needed perl 5.8.3 (from CPAN)

Now, trying to install 4.28-4, the install script nicely informs me I have two
perl installations, and to remove the one from /usr/local.

What is the correct procedure to upgrade my perl (in /usr/bin) from 5.6.0 to
5.8.3 ?

Thanks,
Declan