</code> is used to perform the build. Build times on
    multi-processor systems can be reduced by running parallel processes.</li>
  </ul>

  <h2>Extract System</h2>

  <p>The extract system provides the following features:</p>

  <ul>
    <li>Extract code to a directory tree suitable for feeding into the build
    system. Code can be combined from multiple repositories and branches. Local
    user code can also be included.</li>

    <li>Either a complete set of source code may be extracted or just a set 