title: How to target 4.2 version with XCode 4
body: <p>I've upgraded to XCode 4 which comes with the 4.3 version of the SDK.</p>
  
  <p>But we'd like to make sure our app runs on devices that have 4.2 and later, not just 4.3. </p>
  
  <p>Is there a setting in XCode that can be configured so we don't have to force upgrade everyone just yet?</p>