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<section id="troubleshooting">
<span id="troubleshooting-faq"></span><h1>Troubleshooting<a class="headerlink" href="#troubleshooting" title="Link to this heading">#</a></h1>
<p>For guidance on debugging an installation, see <a class="reference internal" href="../install/index.html#installing-faq"><span class="std std-ref">Frequently asked questions</span></a>.</p>
<section id="problems-with-git">
<span id="git-trouble"></span><h2>Problems with git<a class="headerlink" href="#problems-with-git" title="Link to this heading">#</a></h2>
<p>First, make sure you have a clean build and install (see <a class="reference internal" href="../install/index.html#clean-install"><span class="std std-ref">How to completely remove Matplotlib</span></a>),
get the latest git update, install it and run a simple test script in debug
mode:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">rm</span> <span class="o">-</span><span class="n">rf</span> <span class="o">/</span><span class="n">path</span><span class="o">/</span><span class="n">to</span><span class="o">/</span><span class="n">site</span><span class="o">-</span><span class="n">packages</span><span class="o">/</span><span class="n">matplotlib</span><span class="o">*</span>
<span class="n">git</span> <span class="n">clean</span> <span class="o">-</span><span class="n">xfd</span>
<span class="n">git</span> <span class="n">pull</span>
<span class="n">python</span> <span class="o">-</span><span class="n">m</span> <span class="n">pip</span> <span class="n">install</span> <span class="o">-</span><span class="n">v</span> <span class="o">.</span> <span class="o">></span> <span class="n">build</span><span class="o">.</span><span class="n">out</span>
<span class="n">python</span> <span class="o">-</span><span class="n">c</span> <span class="s2">"from pylab import *; set_loglevel('debug'); plot(); show()"</span> <span class="o">></span> <span class="n">run</span><span class="o">.</span><span class="n">out</span>
</pre></div>
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<p>and post <code class="file docutils literal notranslate"><span class="pre">build.out</span></code> and <code class="file docutils literal notranslate"><span class="pre">run.out</span></code> to the <a class="reference external" href="https://mail.python.org/mailman/listinfo/matplotlib-devel">matplotlib-devel</a>
mailing list (please do not post git problems to the <a class="reference external" href="https://mail.python.org/mailman/listinfo/matplotlib-users">users list</a>).</p>
<p>Of course, you will want to clearly describe your problem, what you
are expecting and what you are getting, but often a clean build and
install will help. See also <a class="reference internal" href="../users/faq.html#reporting-problems"><span class="std std-ref">Get help</span></a>.</p>
</section>
<section id="unlink-of-file-c-internal-utils-cp311-win-amd64-pyd-failed">
<h2>Unlink of file <code class="docutils literal notranslate"><span class="pre">*/_c_internal_utils.cp311-win_amd64.pyd</span></code> failed<a class="headerlink" href="#unlink-of-file-c-internal-utils-cp311-win-amd64-pyd-failed" title="Link to this heading">#</a></h2>
<p>The DLL files may be loaded by multiple running instances of Matplotlib; therefore
check that Matplotlib is not running in any other application before trying to
unlink this file. Multiple versions of Matplotlib can be linked to the same DLL,
for example a development version installed in a development conda environment
and a stable version running in a Jupyter notebook. To resolve this error, fully
close all running instances of Matplotlib.</p>
</section>
<section id="windows-compilation-errors">
<h2>Windows compilation errors<a class="headerlink" href="#windows-compilation-errors" title="Link to this heading">#</a></h2>
<p>If the compiled extensions are not building on Windows due to errors in linking to
Windows' header files, for example <code class="docutils literal notranslate"><span class="pre">../../src/_tkagg.cpp:133:10:</span> <span class="pre">error:</span> <span class="pre">'WM_DPICHANGED'</span> <span class="pre">was</span> <span class="pre">not</span> <span class="pre">declared</span> <span class="pre">in</span> <span class="pre">this</span> <span class="pre">scope</span></code>,
you should check which compiler Meson is using:</p>
<div class="highlight-bat notranslate"><div class="highlight"><pre><span></span>Build type: native build
Project name: matplotlib
Project version: 3.9.0.dev0
C compiler for the host machine: cc (gcc 7.2.0 <span class="s2">"cc (Rev1, Built by MSYS2 project) 7.2.0"</span>)
C linker for the host machine: cc ld.bfd 2.29.1
C++ compiler for the host machine: c++ (gcc 7.2.0 <span class="s2">"c++ (Rev1, Built by MSYS2 project) 7.2.0"</span>)
C++ linker for the host machine: c++ ld.bfd 2.29.1
</pre></div>
</div>
<p>Our <a class="reference internal" href="../install/dependencies.html#dependencies"><span class="std std-ref">dependencies</span></a> documentation lists the minimum header
version if you intended to use <code class="docutils literal notranslate"><span class="pre">MSYS2</span></code>. If you intended to use <code class="docutils literal notranslate"><span class="pre">MSVC</span></code> then
you may need to force Meson to <a class="reference external" href="https://mesonbuild.com/meson-python/how-to-guides/meson-args.html#vsenv-example" title="(in meson-python)"><span class="xref std std-ref">use MSVC</span></a>.</p>
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