I just saw this in the manual, which fixed my problem. I guess I hadn't read it close enough. Wow.
Make sure you do NOT have a space at the beginning of module.xml file or you will get a "New missing/unsatisfied dependencies" error for this driver.
Another highlight to add is this: remove any duplicate
<?xml version="1.0" encoding="UTF-8"?>
that you might have created by copying definitions around. Yuk