title: invalid deployment target for -stdlib=libc++
body: <p>I have updated a very old project of mine(XCODE 4.5.1 baseSDK iOS6) and for some reason i get the error above.</p>
  
  <p>it compiles only for iOS5+
  but not with iOS 4.3</p>
  
  <p>?</p>
  
  <p>any idea ?</p>