First off, have a look at CGI.pm. Then I can think of several possible reasons for this, although I have never run PWS.

• You don't have a shebang line (something like #!/usr/bin/perl) that points to the perl binary. Apache and most other web servers need this to know what to execute with (even on windows). I can only assume that PWS ignore this, yes?
• You don't print the "Content-type: text/html\n\n" header which needs to be the first thing out of the script. Again, see CGI.pm for more info.

My best bet is that you are relying too much on special features in PWS. Hope this helps. :)

Update: Since it is most likely that both Mac OS X and the Red Hat is using Apache, I suggest you take a look here.

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You have moved into a dark place.
It is pitch black. You are likely to be eaten by a grue.

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