problem with perl when installing port dvdrip

[mikael backman]

Hi.
I don't understand what this mean:

%cd /usr/ports/multimedia/dvdrip
%make
===>  dvdrip-0.50.13_1 is marked as broken: You need at least perl 5.6.0. Do 
not use FreeBSD 4.x' system perl, it's outdated. Install lang/perl5 and issue 
'use.perl port'

I installed perl5 ,but " issue 'use.perl port' " ?

Mikael