diff -uNr gcc-4.2.1.orig/gcc/config/arm/rtems-elf.h gcc-4.2.1/gcc/config/arm/rtems-elf.h
--- gcc-4.2.1.orig/gcc/config/arm/rtems-elf.h	2005-11-21 23:56:34.000000000 +0100
+++ gcc-4.2.1/gcc/config/arm/rtems-elf.h	2007-07-20 06:56:39.000000000 +0200
@@ -27,6 +27,7 @@
 #define TARGET_OS_CPP_BUILTINS()		\
     do {					\
 	builtin_define ("__rtems__");		\
+	builtin_define ("__USE_INIT_FINI__");	\
 	builtin_assert ("system=rtems");	\
     } while (0)
 
diff -uNr gcc-4.2.1.orig/gcc/config/c4x/rtems.h gcc-4.2.1/gcc/config/c4x/rtems.h
--- gcc-4.2.1.orig/gcc/config/c4x/rtems.h	2005-06-25 03:22:41.000000000 +0200
+++ gcc-4.2.1/gcc/config/c4x/rtems.h	2007-07-20 06:56:39.000000000 +0200
@@ -24,6 +24,5 @@
 #define TARGET_OS_CPP_BUILTINS()		\
     do {					\
 	builtin_define ("__rtems__");		\
-	builtin_define ("__USE_INIT_FINI__");	\
 	builtin_assert ("system=rtems");	\
     } while (0)
diff -uNr gcc-4.2.1.orig/gcc/config/mips/elf.h gcc-4.2.1/gcc/config/mips/elf.h
--- gcc-4.2.1.orig/gcc/config/mips/elf.h	2006-10-08 09:35:47.000000000 +0200
+++ gcc-4.2.1/gcc/config/mips/elf.h	2007-07-20 06:56:39.000000000 +0200
@@ -49,6 +49,4 @@
 #undef  ENDFILE_SPEC
 #define ENDFILE_SPEC "crtend%O%s crtn%O%s"
 
-#define NO_IMPLICIT_EXTERN_C 1
-
 #define HANDLE_PRAGMA_PACK_PUSH_POP 1