title: How do you set a relative path for a file-based package source with NuGet?
body: <p>I'm using NuGet 2.1 with multiple solutions, each in a child directory under a single parent directory and a single packages directory which is shared by all the solutions (this became possible with NuGet 2.1).</p>
  
  <p>I'd like to add a file-based package source which points to the packages directory in my working copy (I'm using Subversion).</p>
  
  <p>This works:</p>
  
  <pre><code>&lt;configuration&gt;
    &lt;repositoryPath&gt;_Packages&lt;/repositoryPath&gt;
    &lt;activePackageSource&gt;
      &lt;add key="Working copy package source" value="C:\AllMySolutions\_Packages" /&gt;
    &lt;/activePackageSource&gt;
  &lt;/configuration&gt;
  </code></pre>
  
  <p>This doesn't:</p>
  
  <pre><code>&lt;configuration&gt;
    &lt;repositoryPath&gt;_Packages&lt;/repositoryPath&gt;
    &lt;activePackageSource&gt;
      &lt;add key="Working copy package source" value="_Packages" /&gt;
    &lt;/activePackageSource&gt;
  &lt;/configuration&gt;
  </code></pre>
  
  <p>I don't want to hard-code the absolute path but can't find a way of using a relative path in the value attribute inside <code>activePackageSource</code>.</p>