/* Define __MOUSE__ for systems that support a mouse */
-#if defined(__ATARI__) || defined(__C64__) || defined(__C128__) || defined(__CBM510__)
+#if defined(__ATARI__) || defined(__C64__) || defined(__C128__) || defined(__CBM510__) || defined(__GEOS__)
# define __MOUSE__
#else
# error The target system does not support a mouse!