--- gcc/config/i386/386bsd.h	2018/04/24 18:10:27	1.1.1.1
+++ gcc/config/i386/386bsd.h	2018/04/24 18:16:54	1.1.1.2
@@ -9,7 +9,7 @@
 #include "i386/perform.h"
 
 #undef CPP_PREDEFINES
-#define CPP_PREDEFINES "-Dunix -Di386 -D____386BSD____ -D__386BSD__ -DBSD_NET2"
+#define CPP_PREDEFINES "-Dunix -Di386 -D____386BSD____ -D__386BSD__ -DBSD_NET2 -Asystem(unix) -Asystem(bsd) -Acpu(i386) -Amachine(i386)"
 
 /* Like the default, except no -lg.  */
 #define LIB_SPEC "%{!p:%{!pg:-lc}}%{p:-lc_p}%{pg:-lc_p}"