Comment 3 for bug 646647

If it helps, I have changed line 1636 of this file:

 #$perl_version = chr($required_perl_version[0])
        # . chr($required_perl_version[1])
        # . chr($required_perl_version[2]);
       #

        $perl_version = "v$required_perl_version[0].$required_perl_version[1].$required_perl_version[2]";

This now works