title: cannot get NEON intrinsics header to compile in XCode
body: <p>I have some C++ code using NEON intrinsics.  From what I have read, all you need to do is include arm_neon.h to your project..  And then I read that this arm_neon.h header is not actually readily available to you automatically, you have to get it from the web.  So I found and added this version to my project:</p>
  
  <p><a href="http://clang.llvm.org/doxygen/arm__neon_8h-source.html" rel="nofollow noreferrer">http://clang.llvm.org/doxygen/arm__neon_8h-source.html</a></p>
  
  <p>In my project's prefix.pch I added:</p>
  
  <pre><code>#import "arm_neon.h"
  </code></pre>
  
  <p>And when I try to build on my iPhone6 device (I am not using the simulator), I get a billion errors inside the arm_neon.h file:</p>
  
  <p><a href="https://i.stack.imgur.com/yCfYR.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/yCfYR.png" alt="enter image description here"></a></p>
  
  <p>Can anyone please explain to me what I am missing here?</p>