title: How to fix llvmlibc-restrict-system-libc-headers check in Clang Tidy?
body: <p>I do not understand the <code>llvmlibc-restrict-system-libc-headers</code> check in Clang Tidy (<a href="https://releases.llvm.org/11.0.0/tools/clang/tools/extra/docs/clang-tidy/checks/llvmlibc-restrict-system-libc-headers.html" rel="nofollow noreferrer">link</a>).</p>
  <p>I include C libraries in C++ code like this:</p>
  <pre class="lang-cpp prettyprint-override"><code>#include &lt;cstddef&gt;
  </code></pre>
  <p>What should I change to fix this Clang Tidy check?  Should it be fixed at all?</p>