--- gcc/config/i860/mach.h	2018/04/24 18:10:24	1.1.1.1
+++ gcc/config/i860/mach.h	2018/04/24 18:14:59	1.1.1.2
@@ -6,7 +6,7 @@
 #define TARGET_VERSION fprintf (stderr, " (i860 Mach3.x)");
 
 #undef CPP_PREDEFINES
-#define CPP_PREDEFINES "-Dunix -Di860 -DMACH"
+#define CPP_PREDEFINES "-Dunix -Di860 -DMACH -Asystem(unix) -Asystem(mach) -Acpu(i860) -Amachine(i860)"
 
 /* Specify extra dir to search for include files.  */
 #define SYSTEM_INCLUDE_DIR "/usr/mach/include"