diff --git a/sys/Stub_SDL_endian.h b/sys/Stub_SDL_endian.h
index 0a1743a..ec3934a 100644
--- a/sys/Stub_SDL_endian.h
+++ b/sys/Stub_SDL_endian.h
@@ -34,6 +34,10 @@
 #define SDL_LIL_ENDIAN  1234
 #define SDL_BIG_ENDIAN  4321
 
+#ifndef BUILD_IS_BIG_ENDIAN
+  #error BUILD_IS_BIG_ENDIAN should be defined!
+#endif
+
 #if BUILD_IS_BIG_ENDIAN // this is from config.h, set by cmake
   #define SDL_BYTEORDER SDL_BIG_ENDIAN
 #else
diff --git a/sys/sys_public.h b/sys/sys_public.h
index fbac1a8..b1d68e2 100644
--- a/sys/sys_public.h
+++ b/sys/sys_public.h
@@ -58,6 +58,7 @@ typedef enum {
 	SE_KEY,					// evValue is a key code, evValue2 is the down flag
 	SE_CHAR,				// evValue is an ascii char
 	SE_MOUSE,				// evValue and evValue2 are reletive signed x / y moves
+	SE_MOUSE_ABS,			// evValue and evValue2 are absolute x / y coordinates in the window
 	SE_JOYSTICK_AXIS,		// evValue is an axis number and evValue2 is the current state (-127 to 127)
 	SE_CONSOLE				// evPtr is a char*, from typing something at a non-game console
 } sysEventType_t;