1"><code>OPT_FILENAME(short, long, &amp;var, description)</code></dt>
<dd>
<p>Introduce an option with a filename argument.
The filename will be prefixed by passing the filename along with
the prefix argument of <code>parse_options()</code> to <code>prefix_filename()</code>.</p>
</dd>
<dt class="hdlist1"><code>OPT_ARGUMENT(long, &amp;int_var, description)</code></dt>
<dd>
<p>Introduce a long-option argument that will be kept in <code>argv[]</code>.
If this option was seen, <code>int_var</code> will be set t