--- src/celmath/intersect.h.orig 2011-06-06 00:11:15.000000000 +0800
+++ src/celmath/intersect.h 2013-06-16 02:00:47.000000000 +0800
@@ -12,6 +12,7 @@
#ifndef _CELMATH_INTERSECT_H_
#define _CELMATH_INTERSECT_H_
+#include "mathlib.h"
#include "ray.h"
#include "sphere.h"
#include "ellipsoid.h"