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  <title>13.4. Running autogen.pl &mdash; Open MPI 5.0.8 documentation</title>
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      <li class="breadcrumb-item active"><span class="section-number">13.4. </span>Running <code class="docutils literal notranslate"><span class="pre">autogen.pl</span></code></li>
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<h1><span class="section-number">13.4. </span>Running <code class="docutils literal notranslate"><span class="pre">autogen.pl</span></code><a class="headerlink" href="#running-autogen-pl" title="Permalink to this heading"></a></h1>
<p>You can now run OMPI’s top-level <code class="docutils literal notranslate"><span class="pre">autogen.pl</span></code> script.  This script
will invoke the GNU Autoconf, Automake, and Libtool commands in the
proper order and do a bunch of component discovery and housekeeping to
setup to run OMPI’s top-level <code class="docutils literal notranslate"><span class="pre">configure</span></code> script.</p>
<p>Running <code class="docutils literal notranslate"><span class="pre">autogen.pl</span></code> may take a few minutes, depending on your
system.  It’s not very exciting to watch.</p>
<p>If you have a multi-processor system, enabling the multi-threaded
behavior in Automake 1.11 (or newer) can result in <code class="docutils literal notranslate"><span class="pre">autogen.pl</span></code>
running faster.  Do this by setting the <code class="docutils literal notranslate"><span class="pre">AUTOMAKE_JOBS</span></code> environment
variable to the number of processors (threads) that you want it to use
before invoking <code class="docutils literal notranslate"><span class="pre">autogen.pl</span></code>.  For example (you can put this in your
shell startup files):</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span># For bash/sh/zsh:
export AUTOMAKE_JOBS=4

# For csh/tcsh:
setenv AUTOMAKE_JOBS 4
</pre></div>
</div>
<div class="admonition important">
<p class="admonition-title">Important</p>
<p>You generally need to run <code class="docutils literal notranslate"><span class="pre">autogen.pl</span></code> whenever the
top-level file <code class="docutils literal notranslate"><span class="pre">configure.ac</span></code> changes, or any files in the
<code class="docutils literal notranslate"><span class="pre">config/</span></code> or <code class="docutils literal notranslate"><span class="pre">&lt;project&gt;/config/</span></code> directories change (these
directories are where a lot of “include” files for Open MPI’s
<code class="docutils literal notranslate"><span class="pre">configure</span></code> script live).</p>
</div>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>You do <em>NOT</em> need to re-run <code class="docutils literal notranslate"><span class="pre">autogen.pl</span></code> if you modify a
<code class="docutils literal notranslate"><span class="pre">Makefile.am</span></code>.</p>
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