--- gcc/config/i386/mach.h	2018/04/24 18:10:27	1.1.1.1
+++ gcc/config/i386/mach.h	2018/04/24 18:16:50	1.1.1.2
@@ -10,14 +10,11 @@
 #include "i386/perform.h"
 
 #undef CPP_PREDEFINES
-#define CPP_PREDEFINES "-Dunix -Di386 -DMACH"
+#define CPP_PREDEFINES "-Dunix -Di386 -DMACH -Asystem(unix) -Asystem(mach) -Acpu(i386) -Amachine(i386)"
 
 /* Specify extra dir to search for include files.  */
 #define SYSTEM_INCLUDE_DIR "/usr/mach/include"
 
-/* Make stddef.h agree with types.h.  */
-#define SIZE_TYPE "long int"
-
 /* Don't default to pcc-struct-return, because gcc is the only compiler, and
    we want to retain compatibility with older gcc versions.  */
 #define DEFAULT_PCC_STRUCT_RETURN 0