title: “Base SDK Missing” after installing to Xcode 4
body: <p>Hello
  after installing xcode 4 preview 5 I've tried to build a project created with Xcode 3.2.3.
  Unfortunately an error message is displayed:</p>
  
  <blockquote>
    <p>Missing SDK: There is no SDK with the name or path '/User/Me/Desktop/Project/IPhone4.0'</p>
  </blockquote>
  
  <p>any idea to fix it?</p>
  
  <p>thanks a lot</p>