title: How to build the Android sample projects using Ant? build.xml does not exist
body: <p>I believe I've followed the instructions in the Android SDK, and I'm now trying to build the sample LunarLander (random one picked)</p>
  
  <pre><code>$ cd samples/android-11/LunarLander
  $ ant debug
  Buildfile: build.xml does not exist!
  Build failed
  </code></pre>
  
  <p>I believe all PATHs are setup correctly. 
  I've done this before in an older Android SDK release and I know I didn't encounter this error, so I'm pretty confused as to what's wrong.  </p>
  
  <p>Oh, one more piece of info -- I have only installed the 3.0 platform package, so I'm not sure if that is an error or not.</p>