If he uses latest Xcode and KNOWS how to use Xcode 3.2 or Xcode 4, he will find it.
(Remove the frameworks with the wrong path. Add the necessary frameworks to Project. Set the base configuration to latest iOS. Change the settings for device/simulator and debug/release correctly if needed. I had to change the configurations of all the projects. It's pretty annoying, because there are more than a hundred projects.)
Isn't it funny no one told this problem yet?