title: Wiring.h missing in Arduino
body: <p>I'm using the DateTime Library example project, but when I try to compile it, I get the following error message:</p>
  
  <pre><code>Arduino: 1.8.0 (Mac OS X), Board: "Arduino/Genuino Uno"
  
  /Users/Luke/Documents/Arduino/libraries/DateTime/DateTime.cpp:15:20: fatal error: wiring.h: No such file or directory
   #include &lt;wiring.h&gt;
                      ^
  compilation terminated.
  exit status 1
  Error compiling for board Arduino/Genuino Uno.
  
  This report would have more information with
  "Show verbose output during compilation"
  option enabled in File -&gt; Preferences.
  </code></pre>
  
  <p>Please help, as this is ridiculously irritating!</p>