Larian Studios Forums Divinity: Original Sin 2 Divinity - Original Sin 2 - General D:OS 2 Early Acces MAC OSX?

I have a PC and a MacBook and when i'm at a friends place i bring my Mac with me to play games with them.
If I buy the early access on PC now on Steam, do I have to buy the game again when the Mac release comes out? I am planning to play 4 player co-op together in one house.