$ perl -d -MCPAN -e shell
    ...
    DB<1> for (keys %INC) {print "$INC{$_}\n" if /ExtUtils/}
    /usr/lib/perl5/5.6.1/ExtUtils/MakeMaker.pm
    /usr/lib/perl5/5.6.1/ExtUtils/MM_Unix.pm
    DB<2>