--- gcc/config/m68k/altos3068.h	2018/04/24 18:10:24	1.1
+++ gcc/config/m68k/altos3068.h	2018/04/24 18:14:42	1.1.1.2
@@ -62,7 +62,7 @@ the Free Software Foundation, 675 Mass A
 
 /* Names to predefine in the preprocessor for this target machine.  */
 
-#define CPP_PREDEFINES "-Dmc68000 -DPORTAR -Dmc68k32 -Uvax -Dm68k -Dunix"
+#define CPP_PREDEFINES "-Dmc68000 -DPORTAR -Dmc68k32 -Uvax -Dm68k -Dunix -Asystem(unix)  -Acpu(m68k) -Amachine(m68k)"
 
 /* Every structure or union's size must be a multiple of 2 bytes.  */