--- uae/src/od-dos/memory.h	2018/04/24 16:40:30	1.1
+++ uae/src/od-dos/memory.h	2018/04/24 17:15:02	1.1.1.3
@@ -1,11 +1,15 @@
  /*
   * UAE - The Un*x Amiga Emulator
   *
-  * See if this OS has mmap or equivalent
+  * See if this OS has mmap.
   *
   * Copyright 1996 Bernd Schmidt
   */
 
 #undef USE_MAPPED_MEMORY
-#undef CAN_MAP_MEMORY
 
+#if USER_PROGRAMS_BEHAVE > 0
+#define USE_MAPPED_MEMORY
+#endif
+
+#define CAN_MAP_MEMORY