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<style>
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</style><div class="section" id="prerequisites">
<h1><span class="section-number">13.1. </span>Prerequisites<a class="headerlink" href="#prerequisites" title="Permalink to this heading"></a></h1>
<div class="section" id="compilers">
<h2><span class="section-number">13.1.1. </span>Compilers<a class="headerlink" href="#compilers" title="Permalink to this heading"></a></h2>
<p>Although it should probably be assumed, you’ll need a C compiler that
supports C99.</p>
<p>You’ll also need a Fortran compiler if you want to build the Fortran
MPI bindings (the more recent the Fortran compiler, the better), and a
Java compiler if you want to build the (unofficial) Java MPI bindings.</p>
</div>
<div class="section" id="gnu-autotools">
<h2><span class="section-number">13.1.2. </span>GNU Autotools<a class="headerlink" href="#gnu-autotools" title="Permalink to this heading"></a></h2>
<p>When building Open MPI from its repository sources, the GNU Autotools
must be installed (i.e., <a class="reference external" href="https://www.gnu.org/software/autoconf/">GNU Autoconf</a>, <a class="reference external" href="https://www.gnu.org/software/automake/">GNU Automake</a>, and <a class="reference external" href="https://www.gnu.org/software/libtool/">GNU Libtool</a>).</p>
<table class="colwidths-given docutils align-default">
<colgroup>
<col style="width: 50%" />
<col style="width: 50%" />
</colgroup>
<thead>
<tr class="row-odd"><th class="head"><p>Tool</p></th>
<th class="head"><p>Minimum version</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p>Autoconf</p></td>
<td><p>2.69.0</p></td>
</tr>
<tr class="row-odd"><td><p>Automake</p></td>
<td><p>1.13.4</p></td>
</tr>
<tr class="row-even"><td><p>Libtool</p></td>
<td><p>2.4.2</p></td>
</tr>
</tbody>
</table>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>The GNU Autotools are <em>not</em> required when building Open MPI
from distribution tarballs. Open MPI distribution tarballs
are bootstrapped such that end-users do not need to have the
GNU Autotools installed.</p>
</div>
<p>You can generally install GNU Autoconf, Automake, and Libtool via your
Linux distribution native package system, or via Homebrew or MacPorts
on MacOS. This usually “just works.”</p>
<p>If you run into problems with the GNU Autotools, or need to download /
build them manually, see the <a class="reference internal" href="gnu-autotools.html#developers-installing-autotools-label"><span class="std std-ref">how to build and install GNU
Autotools section</span></a> for much
more detail.</p>
</div>
<div class="section" id="perl">
<h2><span class="section-number">13.1.3. </span>Perl<a class="headerlink" href="#perl" title="Permalink to this heading"></a></h2>
<p>Open MPI still uses Perl for a few of its build scripts (most notably,
<code class="docutils literal notranslate"><span class="pre">autogen.pl</span></code>).</p>
<p>Generally speaking, any recent-ish release of Perl 5 should be
sufficient to correctly execute Open MPI’s Perl scripts.</p>
</div>
<div class="section" id="flex">
<h2><span class="section-number">13.1.4. </span>Flex<a class="headerlink" href="#flex" title="Permalink to this heading"></a></h2>
<p>Minimum supported version: 2.5.4.</p>
<p><a class="reference external" href="https://github.com/westes/flex">Flex</a> is used during the
compilation of a developer’s checkout (it is not used to build
official distribution tarballs). Other flavors of lex are <em>not</em>
supported: given the choice of making parsing code portable between
all flavors of lex and doing more interesting work on Open MPI, we
greatly prefer the latter.</p>
<p>Note that no testing has been performed to see what the minimum
version of Flex is required by Open MPI. We suggest that you use
v2.5.35 at the earliest.</p>
<p>For now, Open MPI will allow developer builds with Flex 2.5.4. This
is primarily motivated by the fact that RedHat/CentOS 5 ships with
Flex 2.5.4. It is likely that someday Open MPI developer builds will
require Flex version >=2.5.35.</p>
<p>Note that the <code class="docutils literal notranslate"><span class="pre">flex</span></code>-generated code generates some compiler warnings
on some platforms, but the warnings do not seem to be consistent or
uniform on all platforms, compilers, and flex versions. As such, we
have done little to try to remove those warnings.</p>
<p>If you do not have Flex installed and cannot easily install it via
your operating system’s packaging system (to include Homebrew or
MacPorts on MacOS), see <a class="reference external" href="https://github.com/westes/flex">the Flex Github repository</a>.</p>
</div>
<div class="section" id="sphinx-and-therefore-python">
<h2><span class="section-number">13.1.5. </span>Sphinx (and therefore Python)<a class="headerlink" href="#sphinx-and-therefore-python" title="Permalink to this heading"></a></h2>
<p><a class="reference external" href="https://www.sphinx-doc.org/">Sphinx</a> is a Python-based tool used to
generate both the HTML version of the documentation (that you are
reading right now) and the nroff man pages.</p>
<p>Official Open MPI distribution tarballs contain pre-built HTML
documentation and man pages. This means that — similar to the GNU
Autotools — end users do not need to have Sphinx installed, but will
still have both the HTML documentation and man pages installed as part
of the normal configure / build / install process.</p>
<p>However, the HTML documentation and man pages are <em>not</em> stored in Open
MPI’s Git repository; only the ReStructred Text source code of the
documentation is in the Git repository. Hence, if you are building
Open MPI from a Git clone, you will need Sphinx (and some Python
modules) in order to build the HTML documentation and man pages.</p>
<div class="admonition important">
<p class="admonition-title">Important</p>
<p>Most systems do not have Sphinx and/or the required
Python modules installed by default. <a class="reference internal" href="sphinx.html#developers-installing-sphinx-label"><span class="std std-ref">See the
Installing Sphinx section</span></a> for details on
how to install Sphinx and the required Python modules.</p>
</div>
<p>If <code class="docutils literal notranslate"><span class="pre">configure</span></code> is able to find Sphinx and the required Python
modules, it will automatically generate the HTML documentation and man
pages during the normal build procedure (i.e., during <code class="docutils literal notranslate"><span class="pre">make</span> <span class="pre">all</span></code>).
If <code class="docutils literal notranslate"><span class="pre">configure</span></code> is <em>not</em> able to find Sphinx and/or the required
Python modules, it will simply skip building the documentation.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>If you have built/installed Open MPI from a Git clone and
unexpectedly did not have the man pages installed, it is
likely that you do not have Sphinx and/or the required
Python modules available.</p>
<p><a class="reference internal" href="sphinx.html#developers-installing-sphinx-label"><span class="std std-ref">See the Installing Sphinx section</span></a> for details on how
to install Sphinx and the required Python modules.</p>
</div>
<div class="admonition important">
<p class="admonition-title">Important</p>
<p><code class="docutils literal notranslate"><span class="pre">make</span> <span class="pre">dist</span></code> will fail if <code class="docutils literal notranslate"><span class="pre">configure</span></code> did not find
Sphinx and/or the required Python modules.
Specifically: if <code class="docutils literal notranslate"><span class="pre">make</span> <span class="pre">dist</span></code> is not able to generate
the most up-to-date HTML documentation and man pages,
you cannot build a distribution tarball. <strong>This is an
intentional design decision.</strong></p>
</div>
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