code class="mendoza-code">os/exit</code>, <code class="mendoza-code">os/getenv</code>, and <code class="mendoza-code">os/which</code>. All other functions in the <code class="mendoza-code">os</code>
module will be disabled.
</p>
<h3><code class="mendoza-code">#define JANET_API __attribute__((visibility ("default")))</code>
</h3>
<p>Set this define to change how Janet symbols in the core library are exported. If using dynamic
modules, all symbols in the Janet core library must be publicly visible. It is not 