Can I ask you on which GPU (brand and model) it runs?
While OS X is ver.10.13.6, right?
So I add it between the hardware and software tested, thanks.
The Mac mini is still unhappy and says: ./glChAoSP_OSX Error: NSGL: Failed to find a suitable pixel format
But it's also an old Intel HD Graphics 3000. So please don't drop the macOS port it's working for most configurations.
...and mostly ... I don't would your daughter to stop math study ... :D ;)