$ whichpm CGI       
              CGI.pm : /System/Library/Perl/5.8.6/CGI.pm
         CGI/Util.pm : /System/Library/Perl/5.8.6/CGI/Util.pm
             Carp.pm : /System/Library/Perl/5.8.6/Carp.pm
         Exporter.pm : /System/Library/Perl/5.8.6/Exporter.pm
         constant.pm : /System/Library/Perl/5.8.6/constant.pm
         overload.pm : /System/Library/Perl/5.8.6/overload.pm
           strict.pm : /System/Library/Perl/5.8.6/strict.pm
             vars.pm : /System/Library/Perl/5.8.6/vars.pm
         warnings.pm : /System/Library/Perl/5.8.6/warnings.pm
warnings/register.pm : /System/Library/Perl/5.8.6/warnings/register.pm

CGI version : 3.05