title: Can not install matplotlib on python 2.7
body: <p>When I tried to install matplotlib 2.2.4 on centos 7.4 , and I run <code>setup.py install</code>, The erros is </p>
  
  <blockquote>
    <p>"error: can't copy 'lib/matplotlib/backends/web_backend/jquery-ui-1.12.1': doesn't exist or not a regular file."</p>
  </blockquote>
  
  <p>But the lib/matplotlib/backends/web_backend/jquery-ui-1.12.1 exists.</p>
  
  <p>So who can tell me what to do to fix it.</p>