Remember to cover the basics, that is, what you expected to happen and
what in fact did happen. You don't know how to make a good report? See
https://orgmode.org/manual/Feedback.html#Feedback
Your bug report will be posted to the Org mailing list.
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Subject says it all -- I didn't have orgguide in the installation of the
org-9.3 package, so I pulled the latest git master and copied it from
there. I guess the build process needs a fix.
Emacs : GNU Emacs 26.3 (build 1, x86_64-pc-cygwin, X toolkit, Xaw3d scroll
bars)
of 2019-08-30
Package: Org mode version 9.3 (9.3-elpa @ /home/David/.emacs.d/elpa/org-9.3/)