title: Cannot open include file: 'unistd.h': No such file or directory
body: <p>After having installed <code>libpng</code> into my computer, I've included it into my project using <code>#include &lt;png.h&gt;</code> on a Windows 7 SP1 plateform and using Visual Studio Ultimate 2013.</p>
  
  <p>But at build time, I'm getting this error:</p>
  
  <blockquote>
    <p>C1083: Cannot open include file: 'unistd.h': No such file or directory</p>
  </blockquote>
  
  <p>How do I please to fix this? I haven't found yet any solution in the net?</p>