 <p>Click the Info button on your xib's main window, and set the Deployment Target to iPhone OS 3.0 or iPhone OS 3.1.</p> <p>Edit: Images!</p> <p><img src="http://derailer.org/images/stackoverflow/ibinfobutton/infobutton.png" alt="Info Button"> <img src="http://derailer.org/images/stackoverflow/ibinfobutton/deploymenttargetpopup.png" alt="Deployment Target Popup"></p> <p>(NB: These are from the 10.5 version of IB, but IIRC the 10.6 version is the same or close to it.)</p>