title: error: There is no SDK with the name or path 'iphoneos2.2.1' - after Xcode upgrade
body: <p>I upgraded my Xcode to the Latest version today, my iPhoneSDK OS was 2.2.1 previously. I was alerted during installation I can upgrade Xcode but iPhoneSDK cannot be upgraded. Because my Mac OS was 10.5.4. My iPod Touch runs on version 3.0.</p>
  
  <p>After Xcode upgrade, when I launched old projects, it says <em>error: There is no SDK with the name or path 'iphoneos2.2.1'</em>. Under project settings the only 'baseSDK' is 2.2.1. Also the frameworks are missing.</p>
  
  <p>Whats the solution, I want to run the applications. An OS update would resolve this problem? Is there any way to manually configure the path to iPhone SDK OS in Xcode?</p>
  
  <p>Thanks</p>