 system support, and thus will
be included in the build only when requested using special command-line
options to the <code>configure</code> command:

<p>
<table border= summary="Special Modules">
  <tr>
    <td><b>&nbsp;Module&nbsp;</b></td>
    <td><b>&nbsp;Configure Option&nbsp;</b></td>
    <td><b>&nbsp;Description&nbsp;</b></td>
  </tr>

  <tr>
    <td>&nbsp;<code>mod_ctrls</code>&nbsp;</td>
    <td>&nbsp;<code>--enable-ctrls&nbsp;</td>
    <td>&nbsp;Enables <a href="./Controls.html">Controls</a> funct