  is covered in its documentation. For consistency, each library follows the
        same scheme as above.
      </p>
<p>
        To keep it simple, you should use the flat include directory at boost/spirit/include.
      </p>
<p>
        For some additional information about the rationale you might want to have
        a look at the FAQ entry <a class="link" href="../faq.html#spirit.faq.i_m_very_confused_about_the_header_hell_in_my_boost_spirit_directory__what_s_all_this_about_">Header
        Hell</a>.
  