paqi ... not sure how much help I can be but have you tried changing the path to your /bin ? Look at the top of the oj.pl (or oj.cgi file, depending on what you named it) and you'll see <tt>#!/usr/bin/perl</tt> Try changing this to <tt>#!/usr/local/bin/perl</tt>

Also check in the config file (oj.cfg) to see if the path to the program file is set properly. <tt>$cgi_url = "/cgi-bin/oj.pl";</tt> The default is to look for a file called oj.cgi but if you named that file oj.pl (like I did) but didn't change that command line, it might be causing the 500 error.