Noch einen Tipp für die OSXler: Das aktuelle 'Security Update 2009-001' verhaut Perl:

I did also had problems with perl scripts after installing the security
patch. Strategy for fixing has been worked out and reported here:

http://bulknews.typepad.com/blog/2009/02/mac-os-x-...

As well as in Apple forum
http://discussions.apple.com/thread.jspa?threadID=...

This recipe worked for me so far.