lding</em> data files.</li>

    <li>The build root directory is now locked while a build is running. This
    prevents multiple instances of build running in the same directory.
    However, you can bypass the lock if you specify the new
    <code>--ignore-lock</code> option with <code>fcm build</code>.</li>
  </ul>

  <p>Extract system:</p>

  <ul>
    <li>The destination root directory is now locked while an extract is
    running. This prevents multiple instances of extract running in the same
    direc