Hey all!
Was able to procure a MacBook Air so I could actually test OPHD on a mac. I was able to get it to build!
It's a little wonky atm since it's not a clean mac bundle but the binary does work natively though OS X seems to think it's a Windows binary? Unless I invoke it from a terminal window? Like I said, it's a bit wonky.
Anyway, see attached screenshot. Running on macOS X Catalina. Next step is getting a bundle package that can just be downloaded and run. Not sure how to deal with the code signing but we'll see how that goes but in the mean time, progress!