Probably too late to help, but here goes:
If you're running Windows IIS, you'll need to get into the Registry and modify the key (usually under Script Maps) that executes perl when the server runs your CGI script. Usually, the line reads something like "c:\perl\bin\perl.exe %s %s", but you'll need to edit it to read something like "c:\perl\bin\perl.exe -T %s %s". Of course your particular path and such might vary. Also don't muck around in the Registry unless you're confident you can recover from anything you screw up.

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