en.wikipedia.org/wiki/Long-term_support" target="_top">LTS</a>
    (C++03) version of <a href="http://boost-spirit.com" target="_top">Spirit</a> (currently,
    V2.5.7). For the newest (C++14) version, please follow to <a href="../../../../libs/spirit/doc/x3/html/index.html" target="_top"><span class="emphasis"><em>Spirit.X3</em></span></a>.
    If you're looking for the documentation of Spirit's first generation version
    (formerly Spirit V1.8), see <a href="../../../../libs/spirit/classic/index.html" ta