title: fatal error: filesystem: No such file or directory
body: <p>Using, CentOs 7.1, gcc version 6.1.0 (GCC) 
  I receive this error:</p>
  
  <pre><code>fatal error: filesystem: No such file or directory
  </code></pre>
  
  <p>on this line</p>
  
  <pre><code>#include &lt;filesystem&gt;
  </code></pre>
  
  <p>compiling with</p>
  
  <pre><code>g++ main.cpp -o main -std=c++17
  </code></pre>
  
  <p>where is the problem?</p>