assuming you've already installed the Oculus runtime & it's working on your machine
- start unity (version 5.1.2f1 - download)
- edit > project settings > player, scroll to the bottom of panel on right side of page, "Other Settings", check "Virtual Reality Supported"
- command-p exits full-screen (remember this - ESC does not work)
- assets > import package > custom package... - select OculusUtilities.unitypackage (download)
- on the pop-up panel- keep selections as-is, just click import
- see "assets" panel at bottom of window. double-click OVR > Scenes > Cubes (or whatever scene you want)
- press play
if you get a Dll not found error: in your project folder - Assets > Plugins: rename libOVRGamepad.bundle to OVRGamepad.bundle