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<h4 class="panel-title"><a class="collapsed" role="button" data-toggle="collapse" data-parent="#accordion" href="#collapsePythonHeaders" aria-expanded="false" aria-controls="collapsePythonHeaders"><i class="fa fa-exclamation-triangle"></i> Error: Python.h not found</a></h4>

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<p>If you get an error to the effect of <code class="gs-code">Python.h not found</code>, you need to install development packages for Python.</p>

<code># <span class="gs-root">sudo apt-get install python-dev</span></code>

<code># <span class="gs-root">sudo dnf install python-devel</span></code>

<code># <span class="gs-root">sudo yum install python-devel</span></code>

<p>Note that many other distros/operating systems (including Arch Linux, *BSD and OS X) do not require such packages, as C headers are included with the base distribution of Python.</p>

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<h4 class="panel-title"><a class="collapsed" role="button" data-toggle="collapse" data-parent="#accordion" href="#collapseLxmlErrors" aria-expanded="false" aria-controls="collapseLxmlErrors"><i class="fa fa-exclamation-triangle"></i> Error: missing libxml/libxslt</a></h4>

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<p>If you get errors about various files missing while compiling <code class="gs-code">lxml</code>, you must install headers for the <code class="gs-code">libxml</code>, <code class="gs-code">libxslt</code> and <code class="gs-code">zlib</code> libraries, like so:</p>

<code># <span class="gs-root">sudo apt-get install libxml2-dev libxslt1-dev zlib1g-dev</span></code>

<code># <span class="gs-root">sudo dnf install libxml2-devel libxslt-devel zlib-devel</span></code>

<code># <span class="gs-root">sudo yum install libxml2-devel libxslt-devel zlib-devel</span></code>

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<div class="panel-heading" role="tab" id="headingLxmlKilled">

<h4 class="panel-title"><a class="collapsed" role="button" data-toggle="collapse" data-parent="#accordion" href="#collapseLxmlKilled" aria-expanded="false" aria-controls="collapseLxmlKilled"><i class="fa fa-exclamation-triangle"></i> Error: gcc killed when compiling lxml</a></h4>

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<p>If gcc/cc1 is killed when compiling lxml, you might not have enough RAM — lxml requires at least ~1.5 GB of RAM to compile. To fix this, you can:</p>

<ul>

<li>Install a system package and create your virtualenv with the <code class="gs-code">--system-site-packages</code></li>

<li>Install a system package and symlink it from /usr/lib/pythonX.Y/site-packages to your virtualenv</li>

<li>Use a temporary <a href="https://wiki.archlinux.org/index.php/Swap#Swap_file_creation">swapfile</a> to compile lxml</li>

<li>Create a wheel on a system with more RAM with <code class="gs-code">STATIC_DEPS=true pip wheel lxml</code> (must have the same architecture) and install that instead</li>