title: Could not install packages due to a "Environment error :[error 13]: permission denied : 'usr/local/bin/f2py'"
body: <p>I am trying to install numpy on macOS X but after executing the command <code>pip install numpy</code> I am getting the error:</p>
  
  <blockquote>
    <p>Environment error :[error 13]: permission denied : 'usr/local/bin/f2py</p>
  </blockquote>
  
  <p>How do I fix it?</p>