$ PERL_DL_DEBUG=1 perl -MList::Util -e'print join"\n",sort values %INC'
...
DynaLoader::bootstrap for List::Util (auto/List/Util/Util.so)
/usr/lib/perl5/5.8.8/AutoLoader.pm
/usr/lib/perl5/5.8.8/Carp.pm
/usr/lib/perl5/5.8.8/Exporter.pm
/usr/lib/perl5/5.8.8/List/Util.pm
/usr/lib/perl5/5.8.8/strict.pm
/usr/lib/perl5/5.8.8/vars.pm
/usr/lib/perl5/5.8.8/warnings.pm
/usr/lib/perl5/5.8.8/warnings/register.pm
/usr/lib/perl5/5.8.8/x86_64-linux-thread-multi/Config.pm
/usr/lib/perl5/5.8.8/x86_64-linux-thread-multi/DynaLoader.pm
/usr/lib/perl5/5.8.8/x86_64-linux-thread-multi/XSLoader.pm