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<h1><span class="section-number">4.4. </span>Definitions<a class="headerlink" href="#definitions" title="Permalink to this heading"></a></h1>
<ul class="simple">
<li><p><strong>Source tree:</strong> The tree where the Open MPI source code is located.
It is typically the result of expanding an Open MPI distribution
source code bundle, such as a tarball.</p></li>
<li><p><strong>Build tree:</strong> The tree where Open MPI was built. It is always
related to a specific source tree, but may actually be a different
tree (<a class="reference internal" href="vpath-builds.html#building-open-mpi-vpath-label"><span class="std std-ref">since Open MPI supports VPATH builds</span></a>). Specifically, this is the tree
where you invoked <code class="docutils literal notranslate"><span class="pre">configure</span></code>, <code class="docutils literal notranslate"><span class="pre">make</span></code>, etc. to build and install
Open MPI.</p></li>
<li><p><strong>Installation tree:</strong> The tree where Open MPI was installed. It is
typically the “prefix” argument given to Open MPI’s <code class="docutils literal notranslate"><span class="pre">configure</span></code>
script; it is the directory from which you run installed Open MPI
executables.</p></li>
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