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<h1><span class="section-number">4.5. </span>Filesystem requirements<a class="headerlink" href="#filesystem-requirements" title="Permalink to this heading"></a></h1>
<div class="admonition warning" id="install-filesystem-timestamp-warning-label">
<p class="admonition-title">Warning</p>
<p>If you are building Open MPI on a network filesystem, the
machine you on which you are building <em>must</em> be time-synchronized
with the file server.</p>
</div>
<p>Specifically: Open MPI’s build system <em>requires</em> accurate filesystem
timestamps. If your <code class="docutils literal notranslate"><span class="pre">make</span></code> output shows that it ran GNU Automake,
Autoconf, and/or Libtool, or includes warning about timestamps in the
future, perhaps looking something like this:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>Warning: File `Makefile.am' has modification time 3.6e+04 s in the future
</pre></div>
</div>
<p><strong>Know that this is not normal</strong>, and you likely have an invalid
build.</p>
<p>In this case, you should remove the Open MPI source directory and
start over (e.g., by re-extracting the Open MPI tarball): either
switch to build on a local filesystem, or ensure that the time on your
build machine is synchronized with the time on your file server before
building again.</p>
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