--- gcc/config/clipper/clix.h	2018/04/24 18:10:23	1.1
+++ gcc/config/clipper/clix.h	2018/04/24 18:14:09	1.1.1.2
@@ -23,7 +23,7 @@ the Free Software Foundation, 675 Mass A
 
 /* Names to predefine in the preprocessor for this target machine.  */
 
-#define CPP_PREDEFINES "-Dclipper -Dunix"
+#define CPP_PREDEFINES "-Dclipper -Dunix -Asystem(unix) -Asystem(svr3) -Acpu(clipper) -Amachine(clipper)"
 
 #undef STARTFILE_SPEC
 #define STARTFILE_SPEC  \