title: Unable to install Xcode 5 under Yosemite
body: <p>I've installed Yosemite (developer preview) on my mac. After that, I'm not able to install Xcode from App Store. Error message:</p>
  
  <p>"Xcode can not be installed because your OSX version is too new."</p>
  
  <p>Is there any way to avoid that ?</p>