Still no OSX client on the horizon?

It's been quite a while since the game was ported to work with OpenGL on Linux. What is holding the game back from OSX support, if anything? I've played it on Linux with no problems, compared to on Windows, which was actually slower and more buggy for me (on the same machine).

Also, please don't give the pathetic "macs can't play games. sell it and buy a pc :trollface:" response. It hasn't been valid for about ten years. I'd appreciate a technical answer if possible and even a timeline of when this might happen. I'm a developer and have written OpenGL applications that work across the board, and am just wondering if there's some sort of technicality with the spark engine that's holding it back, or some other reason specific to the game. This has basically prevented me from playing the game since I switched my primary working machine to OSX. I was even planning on giving to the Reinforcement program as soon as I can play again, but it doesn't seem like that's in the near future.

I realize it's not top priority, given the proportion of Mac users on steam (http://store.steampowered.com/hwsurvey), but since there's already Linux support, it just seems wrong that there isn't support for OSX.

Any constructive feedback is appreciated!