d0e767">A program listing with line numbering and callouts</a></dt><dt>2.2. <a href="extensions.html#d0e857">Enabling the extensions from the command line</a></dt></dl></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left">&nbsp;</td><td width="20%" align="center">&nbsp;</td><td width="40%" align="right">&nbsp;<a accesskey="n" href="pr01.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">&nbsp;</td><td width="20%" align="cen