why type "perl -MCPAN -e shell" -> "install XML::Simple" on CentOS 5?

[Rogelio <scubacuda@xxxxxxxxx>]

I'm running nmap2nagios.pl, and I notice that on CentOS 5, I had to
run the following to get it working (when I didn't have to do the same
on CentOS 4)

perl -MCPAN -e shell
(answer questions)
> install XML::Simple

Why is that?
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