There's no purity test and the Hare devs aren't prohibiting you from using Hare on macOS or any other platform. They just don't want to maintain Mac/Windows po

There's no purity test and the Hare devs aren't prohibiting you from using Hare on macOS or any other platform. They just don't want to maintain Mac/Windows ports themselves. If somebody else is interested, they can maintain a port. Like that macOS one that you've already found.