Upgrade existing Perl 5.12 to Perl 5.18 on FreeBSD 9

Recently I’ve been trying to update the perl package on my FreeBSD box to the latest version 5.18 without any success. Here’s a snippet of the error message:

So I turned to Google to see if other people experienced the same thing as me. According to an answer to a similar question about upgrading perl on serverfault.com, one should read

document frequently.

Let’s do it.

I’m using Portmaster, and I’d like to upgrade from perl5.12 to perl5.18.

…and after a very long wait, this was the result:

There you go. If there’s only thing you can take from this post is that if you upgrade packages from sources very often on FreeBSD, you really should check the /usr/ports/UPDATING.