apparently this popup message is unique to macintosh; it has been reported as an issue by several people, but I don't yet see a fix...someone did note that installing the code does work, but it is very large...
may be time to switch over to windows mode, sigh
some posters said to just cancel out of the popup re xcrun.
doing that I get this error message:
Compilation error: 'STATUS_LED_PIN' was not declared in this scope"