Hey there @oldmacman, welcome to the Discourse (or at least your first post, seems you’ve been here for a while)!
As has been mentioned before, OS X and Linux ports will come after the game is feature complete. As we all know waiting is tough, you might have some success playing on OS X with this guide. I have heard multiple people who have had success getting it to work with Wine.
http://discourse.stonehearth.net/t/the-mac-version/12521?u=jomaxro