--- gcc/config/ns32k/pc532-mach.h	2018/04/24 18:10:24	1.1
+++ gcc/config/ns32k/pc532-mach.h	2018/04/24 18:14:52	1.1.1.2
@@ -21,7 +21,7 @@ the Free Software Foundation, 675 Mass A
 #include "ns32k/pc532.h"
 
 #undef CPP_PREDEFINES
-#define CPP_PREDEFINES "-Dns32532 -DPC532 -DMACH=1"
+#define CPP_PREDEFINES "-Dns32532 -DPC532 -DMACH=1 -Asystem(unix) -Asystem(mach) -Acpu(ns32k) -Amachine(ns32k)"
 
 /* Don't default to pcc-struct-return, because gcc is the only compiler, and
    we want to retain compatibility with older gcc versions.  */