this provides an option called
<code class="docutils literal notranslate"><span class="pre">USE_FOO</span></code> that defaults to ON. Otherwise, it sets <code class="docutils literal notranslate"><span class="pre">USE_FOO</span></code> to OFF and
hides the option from the user. If the status of <code class="docutils literal notranslate"><span class="pre">USE_BAR</span></code> or <code class="docutils literal notranslate"><span class="pre">USE_ZOT</span></code>
ever changes, any value for the <code class="d