 output of this rule. Only present
        when there is only one output.
      </span>
    </li>
    <li>
      <span>
        <code class="code">SRC</code>: the source of this rule. Only present
        when there is only one source.
      </span>
    </li>
    <li>
      <span>
        <code class="code">SRCS_&lt;suffix&gt;</code>: Present when you've
        defined named sources on a rule. Each group creates one of these these
        variables with paths to those sources.
      </span>
    </li>
    <