r, or a TLS stack compatible with OpenSSL<sup><a href="#note_1" id="#cite_1" title="At the time of writing, H2O can be built with libressl and boringssl.">1</sup></a></sup>
<li>zlib
</ul>
</p>

<p>
Additional softwares may be required for using certain features.
As an example, to build the <a href="configure/mruby_directives.html">mruby</a> handler, bison and ruby have to be installed.
</p>

<h3 id="from-source">Installing from Source</h3>

<p>
First, clone the master branch from <a href="https://github.com