Unfortunately it seems that this is because development of the Oculus Rift on OS X and Linux has been put on hold. According to a post by the device’s chief architect Atman Binstock, “Our development for OS X and Linux has been paused in order to focus on delivering a high quality consumer-level VR experience at launch across hardware, software, and content on Windows. We want to get back to development for OS X and Linux, but we don’t have a timeline.”
So for those of you guys who are running on OS X or Linux, it seems that you won’t be able to use the Oculus Rift on your computers for now. We suppose one could always run Boot Camp to get Windows on OS X, and users running on Linux could dual boot to Windows if they absolutely have to. Not exactly the most convenient setup we admit but we suppose it is an alternative.
In the meantime the folks at Oculus VR have announced the availability of the headset which they have previously stated would begin shipping to customers in Q1 2016.