diff -r c82b68016c68 -r 2e836bebb518 project_files/hwc/rtl/system.c
--- a/project_files/hwc/rtl/system.c	Tue Nov 13 23:56:50 2012 +0100
+++ b/project_files/hwc/rtl/system.c	Wed Nov 14 00:23:29 2012 +0100
@@ -4,6 +4,18 @@
 #include <stdlib.h>
 #include <wchar.h>
 
+#ifndef M_PI
+// some math.h do not have M_PI macros
+# define M_PI    3.14159265358979323846  /* pi */
+# define M_PI_2  1.57079632679489661923  /* pi/2 */
+# define M_PI_4  0.78539816339744830962  /* pi/4 */
+# define M_PIl   3.1415926535897932384626433832795029L  /* pi */
+# define M_PI_2l 1.5707963267948966192313216916397514L  /* pi/2 */
+# define M_PI_4l 0.7853981633974483096156608458198757L  /* pi/4 */
+#endif
+
+double pi = M_PI;
+
 int paramCount;
 string255 params[MAX_PARAMS];