The server will not let me get the variables:

#!/usr/local/bin/perl

print "Content-type: text/html\n\n";
print "<code>\n";

foreach $key (sort keys(%ENV)) {
  print "$key = $ENV{$key}<p>";
}
[download]

I get an internal server error message

I know nothing about cgi servers. but it seems very clear to me that your setup is completely broken. If you do not have direct access to it, then you will have to contact the appropriate support people to fix it.

---

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.

"Science is about questioning the status quo. Questioning authority".

In the absence of evidence, opinion is indistinguishable from prejudice.

RIP an inspiration; A true Folk's Guy

Thanks BrowserUK. I have put in a service request asking what version of GD, and why the code specified by Lincoln Stein is not working, and also why I get these internal server errors (including why I can't even get the environment variables).