title: Adding project as dependency in XCode 4.x
body: <p>With the revamp of XCode I am having a lot of trouble working out how to add make one xcodeproj dependent on another. It was hard enough to work out before but now I am just stuck.</p>
  
  <p>If I drag lib.xcodeproj into app.xcodeproj it just shows up as an item in the project tree and I can't expand it or see build products for linking. </p>
  
  <p>Can someone give me the correct sequence for adding lib.xcodeproj as a dependency to app.xcodeproj (ie it will build if necessary and link to app)</p>