title: XCode 4 "add build setting condition" not enabled
body: <p>I am trying to include Layar Player in the iPhone application I am developing in XCode 4. One of the steps of section "1.3.1.2 Universal build configuration" asks to click on "Add Build Setting Condition". </p>
  
  <p>But that option is not enabled (it is shown in grey). Only the "Add User-defined Setting" is enabled. How can I make this option to be enabled or what could be wrong?</p>