$ /usr/bin/perl -v
... (v5.18.2) built for darwin-thread-multi-2level ...
$ which perl
/Users/ken/perl5/perlbrew/perls/perl-5.24.0t/bin/perl
$ perl -v
... (v5.24.0) built for darwin-thread-multi-2level ...
$ echo $PATH
$PERLBREW_ROOT/bin:$PERLBREW_ROOT/perls/perl-5.24.0t/bin:...:/opt/local/bin:...:/usr/bin:...