The link I gave was to the download page for the source code. You aren't going to use Sun Studio compiler, it's safe to ignore this warning.

• Click here. Archive Manager will allow you to extract this to your home folder.
• Click on Applications->Accessories->terminal
• type cd perl-5.12.2 press return or enter
• type ./Configure -des -Dprefix=$HOME/localperl (or whatever path you want, this should be fine), press return or enter
• type make test then press return or enter
• type make install then press return or enter

If all goes well it should install to $HOME/localperl, if you have any specific errors let us know.