Lex</em></span> follows. It is a wrapper for
          all necessary definitions to use <span class="emphasis"><em>Spirit.Lex</em></span> in a stand
          alone fashion, and on top of the <a href="http://www.benhanson.net/lexertl.html" target="_top">Lexertl</a>
          library. Additionally we <code class="computeroutput"><span class="preprocessor">#include</span></code>
          two of the Boost headers to define <code class="computeroutput"><span class="identifier">boost</span><span class="special"