title: VS2017: E0135 namespace "std" has no member "filesystem"
body: <p>In order to use: <code>std::filesystem</code> from the C++17 library, my project was migrated from vs2015 to vs2017.</p>
  <p>My project compiles and runs without error, the lib is included without error, but when trying to use <code>std::filesystem</code> I get the following:</p>
  <p><a href="https://i.stack.imgur.com/1dZIY.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/1dZIY.jpg" alt="1" /></a></p>
  <p>It seems the library is not being included but cant see why not?</p>
  <p>Edit:</p>
  <pre class="lang-none prettyprint-override"><code>Microsoft Visual Studio Enterprise 2017
  VisualStudio.15.Release/15.7.3+27703.2026
  Visual C++ 2017   00369-90000-00000-AA466
  Microsoft Visual C++ 2017
  </code></pre>