ken@titan ~/tmp
$ perl -v | head -2 | tail -1
This is perl 5, version 40, subversion 0 (v5.40.0) built for cygwin-thread-multi

$ which perl
/home/ken/perl5/perlbrew/perls/perl-5.40.0/bin/perl

$ /usr/bin/perl -v | head -2 | tail -1
This is perl 5, version 40, subversion 2 (v5.40.2) built for x86_64-cygwin-threads-multi