--- src/celmath/intersect.h.orig	2014-04-26 15:57:58.793912004 +0200
+++ src/celmath/intersect.h	2014-04-26 16:00:49.024908956 +0200
@@ -15,7 +15,7 @@
 #include "ray.h"
 #include "sphere.h"
 #include "ellipsoid.h"
-
+#include "mathlib.h"
 
 template<class T> bool testIntersection(const Ray3<T>& ray,
                                         const Sphere<T>& sphere,