title: Facebook demo app fails to build on iOS
body: <p>iOS beginner here. I'm trying to build the <a href="https://github.com/facebook/facebook-ios-sdk/tree/master/sample/DemoApp" rel="nofollow">Facebook Demo App</a> but I keep getting the following error:</p>
  
  <pre><code>Check dependencies
  
  [BEROR]No architectures to compile for (ARCHS=i386, VALID_ARCHS=armv7 armv6).
  </code></pre>
  
  <p>Any idea what causes this?</p>