--- a/gcc/config/rs6000/sysv4.h	Fri Oct 27 22:46:09 2017 +0900
+++ b/gcc/config/rs6000/sysv4.h	Thu Oct 25 07:37:49 2018 +0900
@@ -1,5 +1,5 @@
 /* Target definitions for GNU compiler for PowerPC running System V.4
-   Copyright (C) 1995-2017 Free Software Foundation, Inc.
+   Copyright (C) 1995-2018 Free Software Foundation, Inc.
    Contributed by Cygnus Support.
 
    This file is part of GCC.
@@ -23,10 +23,6 @@
    see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
    <http://www.gnu.org/licenses/>.  */
 
-/* Header files should be C++ aware in general.  */
-#undef  NO_IMPLICIT_EXTERN_C
-#define NO_IMPLICIT_EXTERN_C
-
 /* Yes!  We are ELF.  */
 #define	TARGET_OBJECT_FORMAT OBJECT_ELF
 
@@ -608,9 +604,6 @@
 
 #define LINK_OS_DEFAULT_SPEC ""
 
-#define DRIVER_SELF_SPECS "%{mfpu=none: %<mfpu=* \
- 	%<msingle-float %<mdouble-float}"
-
 /* Override rs6000.h definition.  */
 #undef	CPP_SPEC
 #define	CPP_SPEC "%{posix: -D_POSIX_SOURCE} \