On my NetBSD 3.0 their is no Perl package.

I doubt that. The package is called lang/perl5, and has existed since 1997. The current 5.14 package may still support your old version -- I recently saw one frequently-updated package patching for a NetBSD <2.99 installation! And even if you cannot get the newest version of Perl, 5.8 is still pretty good to work with.