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  <section class="tex2jax_ignore mathjax_ignore" id="basic-installation-instructions">
<h1>Basic Installation Instructions<a class="headerlink" href="#basic-installation-instructions" title="Link to this heading">#</a></h1>
<p>The following is a quick-start guide for installing SLEPc. For further details, see the <a class="reference internal" href="../documentation/manual/intro.html#sec-inst"><span class="std std-ref">Installation</span></a> section of the Users Manual.</p>
<p>Previously to the installation of SLEPc, the system must have an appropriate version of PETSc installed (see the <a class="reference external" href="https://petsc.org/release/install/" target="_blank">PETSc installation documentation</a> for details).</p>
<p>The installation process for SLEPc is very similar to PETSc, with two main stages: configuration and compilation. SLEPc configuration is much simpler because most of the configuration information is taken from PETSc, including compiler options and scalar type (real or complex). Several configurations can coexist in the same directory tree, being selected by different values of <code class="docutils notranslate"><span class="pre">PETSC_ARCH</span></code>, so that one can, for instance, have a SLEPc compiled with real scalars and another one with complex scalars.</p>
<p>The main steps for the installation are:</p>
<ol class="arabic simple">
<li><p>Unbundle the distribution file <strong><a class="reference external" href="https://slepc.upv.es/download/distrib/slepc-3.24.1.tar.gz" target="_blank">slepc-3.24.1.tar.gz</a></strong> with a usual command such as</p></li>
</ol>
<pre class="literal-block">$ tar xzf slepc-3.24.1.tar.gz</pre>
<p>This will create a directory and unpack the software there.</p>
<ol class="arabic simple" start="2">
<li><p>Set the environment variable <code class="docutils notranslate"><span class="pre">SLEPC_DIR</span></code> to the full path of the SLEPc home directory, for example,</p></li>
</ol>
<pre class="literal-block">$ export SLEPC_DIR=/home/username/slepc-3.24.1</pre>
<p>In addition to this variable, <code class="docutils notranslate"><span class="pre">PETSC_DIR</span></code> and <code class="docutils notranslate"><span class="pre">PETSC_ARCH</span></code> must also be set appropriately.</p>
<ol class="arabic simple" start="3">
<li><p>In the SLEPc directory, execute</p></li>
</ol>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>./configure
</pre></div>
</div>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>In order to enable external packages (see below), this command must be run with appropiate options. To see all available options use <code class="docutils notranslate"><span class="pre">./configure</span> <span class="pre">--help</span></code></p>
</div>
<ol class="arabic simple" start="4">
<li><p>In the SLEPc home directory, type</p></li>
</ol>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>make
</pre></div>
</div>
<ol class="arabic simple" start="5">
<li><p>Optionally, if an installation directory has been specified during configuration (with option <code class="docutils notranslate"><span class="pre">--prefix</span></code> in step 3 above), then type</p></li>
</ol>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>make<span class="w"> </span>install
</pre></div>
</div>
<p>This is useful for building as a regular user and then copying the libraries and include files to the system directories as root.</p>
<ol class="arabic simple" start="6">
<li><p>If the installation went smoothly, then try running some test examples with</p></li>
</ol>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>make<span class="w"> </span>check
</pre></div>
</div>
<p>Examine the output for any obvious errors or problems.</p>
<section id="optional-software">
<h2>Optional Software<a class="headerlink" href="#optional-software" title="Link to this heading">#</a></h2>
<p>SLEPc provides an interface to several software packages. These should be installed before installing SLEPc. These packages are not developed, maintained, or supported by the SLEPc team; we merely provide an interface to them. To integrate one of these libraries in SLEPc:</p>
<ul class="simple">
<li><p>First install the external package following its instructions. Make sure you use the same compilers and MPI that you plan to use with PETSc/SLEPc.</p></li>
<li><p>Enable the utilization of the external software from SLEPc by adding specific command-line parameters when executing <code class="docutils notranslate"><span class="pre">configure</span></code>. For example, to use ARPACK, specify the following options (with the appropriate paths):</p></li>
</ul>
<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>./configure<span class="w"> </span>--with-arpack-dir<span class="o">=</span>/usr/software/ARPACK
</pre></div>
</div>
<ul class="simple">
<li><p>Build the SLEPc libraries.</p></li>
</ul>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>For some external packages, the SLEPc <code class="docutils notranslate"><span class="pre">configure</span></code> script can handle handle automatic download and installation, for example adding the option <code class="docutils notranslate"><span class="pre">--download-arpack</span></code>.</p>
</div>
<p>For a full list of external packages currently supported by SLEPc, see the <a class="reference internal" href="../documentation/manual/extra.html#sec-wrap"><span class="std std-ref">Wrappers to External Libraries</span></a> section of the Users Manual.</p>
</section>
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