title: No such file or directory in opencv2
body: <p>How to solve this error?</p>
  
  <pre><code>opencv2/imgproc/imgproc_c.h: No such file or directory
  </code></pre>
  
  <p>I have tried out all the possibilities, but no success. Not only one file. But not any of <strong>opencv2/</strong></p>