They seem to have a build script for "OSX" but maybe it's just incomplete / work-in-progress? It uses glfw, which I know for sure still runs on Mac because I use it in my own cross-platform graphics projects.
TBF, the only reason why macOS isn't currently supported seems to be some minor build system details (e.g. the toplevel CMakeLists.txt file has explicit support for Windows, Linux, Android, iOS and Emscripten, but not macOS).
https://github.com/mgerdes/Open-Golf/issues/3