ware/bison/">bison</a>, <a href="https://www.ruby-lang.org/">ruby</a> and the development files<sup><a href="#note_3" id="#cite_3" title="mkmf - a program for building ruby extensions is required.  In many distributions, the program is packaged as part of ruby-dev or ruby-devel package.">3</sup></a></sup>) are found.
</dl>
<dt><code>-DWITH_DTRACE=<i>on</i>|<i>off</i></code></dt>
<dd>
This option instructs whether or not to enable DTrace support.
It is turned on by default if the prerequisites (<a href="http