title: Building Unreal Engine 4: OS_X
body: <p>After downloaded from github,
  run the <code>GenerateProjectFiles.command</code> file,
  it says</p>
  
  <blockquote>
    <p>Setting up Unreal Engine 4 project files...</p>
    
    <p>GenerateProjectFiles ERROR: It looks like youre missing some files that are required in order to generate projects.  Please check that youve downloaded and unpacked the engine source code, binaries, content and third-party dependencies before running this script.
    ~/UDK_4.0/UnrealEngine
    logout</p>
  </blockquote>
  
  <p>But I already have <code>Xcode 5.1</code>
  and officially they have no reference about third-party dependencies.
  any ideas to try?</p>