title: How to enable multi-dex option for Android in Unity3D?
body: <p>On building with Unity, I am getting an error:</p>
  
  <pre><code>trouble writing output: Too many method references: 78849; max is 65536.
  You may try using --multi-dex option.
  </code></pre>
  
  <p>But I can't figure out how to explicitly tell Unity to use multi dex.</p>