This is GitHub's description of the macOS runner:
https://github.com/actions/virtual-envi ... -Readme.md
I'm going to go over that closely and see if I can figure out why FO builds on their servers but not on my computers. Also, I've started using Anka, which gives me a good clean test bed so I can easily start over if I install something wrong. When I was doing this last year it was basically messing with my main computer and I didn't have the flexibility to install whatever I wanted.
Building on macOS 10.14
Moderator: Oberlus