While you could certainly investigate and debug CGI.pm, you really shouldn't use -w on the shebang line (#!/usr/bin/perl -w) and use warnings; instead. See What's wrong with -w and $^W.

In reply to Re^3: Perl CGI.PM: Use of uninitialized value $vals by haukex
in thread Perl CGI.PM: Use of uninitialized value $vals by Anonymous Monk

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