This is Perl module CLI::Dispatch::Docopt.
CLI::Dispatch::Docopt installation is straightforward. If your CPAN shell is set up, you should just be able to do
% cpan CLI::Dispatch::Docopt
Download it, unpack it, then build it as per the usual:
% perl Makefile.PL
% make && make test
Then install it:
% make install
CLI::Dispatch::Docopt documentation is available as in POD. So you can do:
% perldoc CLI::Dispatch::Docopt
CLI::Dispatch::Docopt is hosted on github http://github.com/bayashi/CLI-Dispatch-Docopt
This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See perlartistic.
Dai Okabayashi <bayashi@cpan.org>