--- ./src/util/math.h.orig	2016-07-14 04:13:22.861482580 +0100

+++ ./src/util/math.h	2016-07-14 04:15:36.966067224 +0100

@@ -4,7 +4,13 @@

 // Causes MSVC to define M_PI and friends.

 // http://msdn.microsoft.com/en-us/library/4hwaceh6.aspx

 #define _USE_MATH_DEFINES

-#include <cmath>

+#include <math.h>

+#include <cmath> 

+// Note: Because of our fpclassify hack, we actualy need to inlude both, 

+// the c and the c++ version of the math header.  

+// From GCC 6.1.1 math.h depends on cmath, which failes to compile if included 

+// after our fpclassify hack 

+

 #include <algorithm>

 #include "util/assert.h"