to
which the generated C++ is written.</p></li>
<li><p><code>--allow_undefined</code> - Do not throw a parser error
if there is a function in the Stan program
that is declared but not defined in the functions block.</p></li>
<li><p><code>--include_paths=&lt;dir1,...dirN&gt;</code> - Takes a comma-separated list
of directories that may contain a file in an <code>#include</code> directive.</p></li>
</ul>
</div>
<div id="using-external-c-code" class="section level2" number="15.5">
<h2><span class="header-secti