--- gcc/config/m68k/apollo68.h	2018/04/24 18:10:24	1.1
+++ gcc/config/m68k/apollo68.h	2018/04/24 18:21:06	1.1.1.3
@@ -75,7 +75,7 @@ the Free Software Foundation, 675 Mass A
 /* These are the ones defined by Apollo, plus mc68000 for uniformity with
    GCC on other 68000 systems.  */
 
-#define CPP_PREDEFINES "-Dapollo -Daegis -Dunix"
+#define CPP_PREDEFINES "-Dapollo -Daegis -Dunix -Asystem(unix)  -Acpu(m68k) -Amachine(m68k)"
 
 /* cpp has to support a #sccs directive for the /usr/include files */
 
@@ -180,12 +180,6 @@ the Free Software Foundation, 675 Mass A
 #undef REGISTER_PREFIX
 #define REGISTER_PREFIX "%"
 
-/* In the machine description we can't use %R, because it will not be seen
-   by ASM_FPRINTF.  (Isn't that a design bug?).  */
-
-#undef REGISTER_PREFIX_MD
-#define REGISTER_PREFIX_MD "%%"
-
 /* config/m68k.md has an explicit reference to the program counter,
    prefix this by the register prefix.  */