[Koha] translator script (tmpl_process3.pl) error - modifying @INC ?

[Stefan Gesing]

Hello list,
Following the translation-howto http://www.kohadocs.
org/KOHAtranslation/translation.html, I tried to execute the script 
in /home/koha-2.2.5/scripts/misc/translator

to receive the following message:

 
     keuch at debian:~/koha-2.2.5/scripts/misc/translator$ .
     /tmpl_process3.pl --help Can't locate Locale/PO.pm in @INC 
     (@INC contains: /etc/perl /usr/local/lib/perl/5.8.4 
     /usr/local/share/perl/5.8.4 /usr/lib/perl5 /usr/share/perl5 
     /usr/lib/perl/5.8      /usr/share/perl/5.8 
     /usr/local/lib/site_perl .) at ./tmpl_process3.pl line 16. 
     BEGIN failed--compilation aborted at ./tmpl_process3.pl line 
     16. 

has anyone experienced this before? couldn't find much in the 
archive. does it mean i need to add a path to @INC? How do I do 
that? thanks in advance and nice greetings,

Stefan