--- gcc/config/m68k/sun2.h	2018/04/24 18:10:24	1.1
+++ gcc/config/m68k/sun2.h	2018/04/24 18:14:38	1.1.1.2
@@ -43,7 +43,7 @@ the Free Software Foundation, 675 Mass A
   
 /* Names to predefine in the preprocessor for this target machine.  */
 
-#define CPP_PREDEFINES "-Dmc68000 -Dsun -Dunix"
+#define CPP_PREDEFINES "-Dmc68000 -Dsun -Dunix -Asystem(unix)  -Asystem(bsd) -Acpu(m68k) -Amachine(m68k)"
 
 /* Prevent error on `-sun2' and `-target sun2' options.  */