title: Support library missing
body: <p>I am trying to add an existing project as a module. However, it wont compile as it says this library is missing:</p>
  
  <pre><code>android-support-v4.jar =&gt; com.android.support:support-v4:20.+
  </code></pre>
  
  <p>I have opened the sdk manager and installed the latest version of Android Support Library but the error remains. How can I fix this please?</p>