><p>Every file set is associated with a particular type of file. <code class="docutils literal notranslate"><span class="pre">HEADERS</span></code>
is currently the only defined type and it is an error to specify anything
else. As a special case, if the name of the file set is <code class="docutils literal notranslate"><span class="pre">HEADERS</span></code>, the
type does not need to be specified and the <code class="docutils literal notranslate"><span class="pre">TYPE</span> <span class="pre">&lt;type&gt;