Hello @degarske,
Updating the submodule fixed it. I've a bad cold and my brain is minimally functional this week. I should have figured this out myself. Now everything builds...keytools, and make.
I can't help compare this process, even including my bumbling, with the pain of trying to get SBSFU or TF-M apps working on macOS. Without running on Windows, which I resist, getting those apps to build is a long process....real long.
Thank you for rapidly helping! I have to admit, this is exciting.
@embhorn. I'm refactoring an old X-CUBE-SBSFU project used for an IOT industrial control project. It's no longer in service due to persistent communication problems, but I've resolved them. Now I'm replacing the SBSFU boot loader with either MCUBoot or WolfBoot. And later adding an RTOS. I'm in Hot Springs Village, AR.
Clark