I've just re-invented a wheel and discovered a way to say which modules uses given one, and from which location they come.
Quite simple and usefull (for me at least).
for Win32: 
perl -Mvars -we "print join qq/\n/,map {qq/$_=>$INC{$_}/} sort keys %I
+NC"

[download]
for other systems (including Cygwin): 
perl -Mvars -we 'print join qq/\n/,map {qq/$_=>$INC{$_}/} sort keys %I
+NC'

[download]
Sample output will be 
Carp.pm=>D:/perl561/lib/Carp.pm
Exporter.pm=>D:/perl561/lib/Exporter.pm
strict.pm=>D:/perl561/lib/strict.pm
vars.pm=>D:/perl561/lib/vars.pm
warnings.pm=>D:/perl561/lib/warnings.pm
warnings/register.pm=>D:/perl561/lib/warnings/register.pm

[download]
If other module needed, specify, for example, other -M option

In reply to look which and from where modules were included by svad

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