$ perl -v | head -2 | tail -1
This is perl 5, version 36, subversion 0 (v5.36.0) built for cygwin-thread-multi

$ perl -V
Summary of my perl5 (revision 5 version 36 subversion 0) configuration:

  Platform:
    osname=cygwin
    osvers=3.2.0(0.34053)
    archname=cygwin-thread-multi
    uname='cygwin_nt-10.0 titan 3.2.0(0.34053) 2021-03-29 08:42 x86_64 cygwin '
...
    gccversion='10.2.0'
...

$ perlmodver Tk
Tk 804.036
  in /home/ken/perl5/perlbrew/perls/perl-5.36.0/lib/site_perl/5.36.0/cygwin-thread-multi/Tk.pm
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