title: "Package does not exist" error using Android v4 Compatibility Library
body: <p>I'm using MonoDroid 4.2 in Visual Studio 2010, and I'm trying to use ViewPager, Fragments, and other things from the Android v4 Compatibility Library.</p>
  
  <p>I was able to add the project reference to <code>Mono.Android.Support.v4.dll</code> and at design time I get no errors and intellisense works fine.</p>
  
  <p>But when I build, I get errors like this:</p>
  
  <blockquote>
    <p>package android.support.v4.view.ViewPager does not exist
    android.support.v4.view.ViewPager.OnPageChangeListener</p>
  </blockquote>
  
  <p>If I double-click on the error, it opens the source java file that MonoDroid creates on the fly, and goes to the line with the problem:</p>
  
  <pre><code>public class ViewPagerTestActivity_MyPagerAdapter
    extends android.support.v4.view.PagerAdapter
  </code></pre>
  
  <p>So it looks like Java can't find the library package, but I'm not sure why.  Do I need to install that manually, and how do I tell MonoDroid where to find it?</p>