--- gcc/config/m68k/hp3bsd.h	2018/04/24 18:10:24	1.1
+++ gcc/config/m68k/hp3bsd.h	2018/04/24 18:14:26	1.1.1.2
@@ -11,7 +11,7 @@
 
 /* Names to predefine in the preprocessor for this target machine.  */
 
-#define CPP_PREDEFINES "-Dmc68000 -Dmc68020 -Dhp300 -Dhp9000 -Dunix"
+#define CPP_PREDEFINES "-Dmc68000 -Dmc68020 -Dhp300 -Dhp9000 -Dunix -Asystem(unix)  -Asystem(bsd) -Acpu(m68k) -Amachine(m68k)"
 
 /* Link with libg.a when debugging, for dbx's sake.  */