title: FLTK in xCode math.h error
body: <p>I have been trying to set up FLTK in xCode. After a little struggling I thought I was successful in linking all the libraries, etc... However, I am now getting the following error from the math.h file located in the FL/include folder:</p>
  
  <pre><code>'/usr/include/math.h'file not found
  </code></pre>
  
  <p>from the following code:</p>
  
  <pre><code>// Xcode on OS X includes files by recursing down into directories.
  // This code catches the cycle and directly includes the required file.
  
  #ifdef fl_math_h_cyclic_include 
  #  include "/usr/include/math.h"
  #endif
  </code></pre>
  
  <p>I have read through a few different solutions posted before, but none of them are seeming to work for me. There is no file <code>math.h</code> located in that directory. Thanks in advance for the help!</p>