The permissions should be the same as the other files in the /opt/lampp/lib/perl5/5.10.1 folders - it looks like that could be 411 or 644 either.
BTW - after some fighting with Fedora, I have a new Fedora 16 VM running (I'm typing this from it). Later I'm going to set up LAMPP 1.7.7 so I have a working environment. That way I can see whats going on with folders and include paths.
I do have a question, are you using this with a Perl program you wrote, or a script or what???