Because they all use
Devel::Modlist ?
:)
perl -MDevel::Modlist -MCGI -MSafe -Mautodie -e 1
ActivePerl::Config
ActiveState::Path 1.00
AutoLoader 5.67
CGI 3.43
CGI::Util 1.5_01
Carp 1.10
Carp::Heavy
Config
Config_heavy.pl
Cwd 3.3
C:::Perl::site::lib::sitecustomize.pl
Exporter 5.63
Exporter::Heavy 5.63
Fatal 2.05
Fcntl 1.06
File::Basename 2.77
List::Util 1.21
Opcode 1.0601
POSIX 1.1501
Safe 2.16
Scalar::Util 1.21
Tie::Hash 1.03
Tie::RefHash 1.38
XSLoader 0.10
autodie 2.05
constant 1.17
overload 1.06
re 0.0601
subs 1.00
vars 1.01
warnings 1.05_01
warnings::register 1.01