Ok, I am banging my head against the desk right now. I didn't see the difference. Thanks for lending me your eyes, choroba. This has got to be one of the most inattentive mistakes I've made on PMo. I just had other things on my mind.

After pulling Win32::Clipboard into the repo, I successfully installed Clipboard.pm:

...
Appending installation info to /usr/lib/perl5/5.40/x86_64-cygwin-threads/perllocal.pod
OK
Successfully installed Win32-Clipboard-0.58
Appending installation info to /usr/lib/perl5/5.40/x86_64-cygwin-threads/perllocal.pod
...
OK
Successfully installed Clipboard-0.13
Installing /usr/local/share/perl5/site_perl/5.40/x86_64-cygwin-threads-multi/.meta/Clipboard-0.13/install.json
2 distributions installed