title: Build Solr with custom version string
body: <p>I've modified a patch for Solr 4.10.4, I have it working, and I can successfully compile and package it. I now want to customize the version to indicate that it's not vanilla Solr.</p>
  
  <p>I've looked though the ant build configurations, but I haven't been able to find the actual version setting used. <code>solr-4.10.4/build.xml</code> has:</p>
  
  <pre class="lang-xml prettyprint-override"><code>&lt;property name="version" value="4.10.1-SNAPSHOT"/&gt; 
  </code></pre>
  
  <p>However, Solr is compiled as <code>4.10.4-SNAPSHOT</code> so that's not the actual version used. Nothing stands out in <code>solr-4.10.4/solr/build.xml</code>.</p>
  
  <p>How do you customize Solr's version string when building with <em>ant</em>?</p>