Mostly Emacs versions under macOS does not have compiled with DBus. Or
still don't work even compiled with DBus even macOS installed dbus with
homebrew. I'm under this situation and problem. Spend lot of time have
not solution to solve this problem. So I give up on Emacs DBus support
under macOS to make "notifications.el" work.

I added patch on org-notify.el to make it invoke AppleScript command to
display notifications. Hope it help some macOS users.