$ perl -v | head -2 | tail -1
This is perl 5, version 30, subversion 0 (v5.30.0) built for cygwin-thread-multi

$ perl -V
Summary of my perl5 (revision 5 version 30 subversion 0) configuration:

  Platform:
    osname=cygwin
    osvers=3.0.7(0.33853)
    archname=cygwin-thread-multi
    uname='cygwin_nt-10.0 titan 3.0.7(0.33853) 2019-04-30 18:08 x86_64 cygwin '
...
    gccversion='7.4.0'
...

$ perlmodver Tk
Tk 804.034
  in /home/ken/perl5/perlbrew/perls/perl-5.30.0/lib/site_perl/5.30.0/cygwin-thread-multi/Tk.pm
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