diff --git a/config/ChangeLog b/config/ChangeLog
index 96d5f7505..809275e20 100644
--- a/config/ChangeLog
+++ b/config/ChangeLog
@@ -1,3 +1,13 @@
+2009-07-30  Ralf Wildenhues  <Ralf.Wildenhues@gmx.de>
+
+	* extensions.m4 (AC_USE_SYSTEM_EXTENSIONS): Do not expand
+	for Autoconf 2.62 or newer.
+	* tls.m4 (GCC_CHECK_TLS): Fix m4 quotation.
+	* no-executables.m4 (_AC_COMPILER_EXEEXT): Fix m4 quotation.
+	* override.m4 (m4_copy_force, m4_rename_force): Provide
+	macros if not defined.
+	(AC_PREREQ): Use m4_copy_force.
+
 2009-07-17  Joseph Myers  <joseph@codesourcery.com>
 
 	PR other/40784
diff --git a/config/extensions.m4 b/config/extensions.m4
index 8ae4a675e..eb59f2721 100644
--- a/config/extensions.m4
+++ b/config/extensions.m4
@@ -1,7 +1,7 @@
-# serial 5  -*- Autoconf -*-
+# serial 6  -*- Autoconf -*-
 # Enable extensions on systems that normally disable them.
 
-# Copyright (C) 2003, 2006, 2007 Free Software Foundation, Inc.
+# Copyright (C) 2003, 2006, 2007, 2009 Free Software Foundation, Inc.
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
@@ -12,6 +12,8 @@
 # enough in this area it's likely we'll need to redefine
 # AC_USE_SYSTEM_EXTENSIONS for quite some time.
 
+m4_version_prereq([2.62],, [
+
 # AC_USE_SYSTEM_EXTENSIONS
 # ------------------------
 # Enable extensions on systems that normally disable them,
@@ -74,3 +76,4 @@ AC_BEFORE([$0], [AC_RUN_IFELSE])dnl
   AC_DEFINE([_TANDEM_SOURCE])
 ])# AC_USE_SYSTEM_EXTENSIONS
 
+])
diff --git a/config/no-executables.m4 b/config/no-executables.m4
index c4d0b70c3..90616245e 100644
--- a/config/no-executables.m4
+++ b/config/no-executables.m4
@@ -25,7 +25,7 @@ AC_BEFORE([$0], [_AC_COMPILER_EXEEXT])
 AC_BEFORE([$0], [AC_LINK_IFELSE])
 
 m4_define([_AC_COMPILER_EXEEXT],
-AC_LANG_CONFTEST([AC_LANG_PROGRAM()])
+[AC_LANG_CONFTEST([AC_LANG_PROGRAM()])
 # FIXME: Cleanup?
 AS_IF([AC_TRY_EVAL(ac_link)], [gcc_no_link=no], [gcc_no_link=yes])
 if test x$gcc_no_link = xyes; then
@@ -35,7 +35,7 @@ if test x$gcc_no_link = xyes; then
   cross_compiling=yes
   EXEEXT=
 else
-  m4_defn([_AC_COMPILER_EXEEXT])dnl
+  ]m4_defn([_AC_COMPILER_EXEEXT])dnl
 fi
 )
 
diff --git a/config/override.m4 b/config/override.m4
index 9bb149620..bf112db99 100644
--- a/config/override.m4
+++ b/config/override.m4
@@ -12,6 +12,16 @@ dnl
 dnl The _GCC_AUTOCONF_VERSION_TEST ensures that exactly the desired
 dnl Autoconf version is used.  It should be kept for consistency.
 
+dnl Provide m4_copy_force and m4_rename_force for old Autoconf versions.
+
+m4_ifndef([m4_copy_force],
+[m4_define([m4_copy_force],
+[m4_ifdef([$2], [m4_undefine([$2])])m4_copy($@)])])
+
+m4_ifndef([m4_rename_force],
+[m4_define([m4_rename_force],
+[m4_ifdef([$2], [m4_undefine([$2])])m4_rename($@)])])
+
 dnl m4_PACKAGE_VERSION is an undocumented Autoconf macro.
 dnl We use it because this fix is intended for 2.59 only.
 dnl A feature test for the broken AC_CONFIG_SUBDIRS instead
@@ -25,7 +35,7 @@ ifdef([m4_PACKAGE_VERSION],
 [dnl AC_DEFUN a commonly used macro so this file is picked up.
 m4_copy([AC_PREREQ], [_AC_PREREQ])
 AC_DEFUN([AC_PREREQ], [frob])
-m4_copy([_AC_PREREQ], [AC_PREREQ])
+m4_copy_force([_AC_PREREQ], [AC_PREREQ])
 
 
 dnl Ensure exactly this Autoconf version is used
diff --git a/config/tls.m4 b/config/tls.m4
index 0ae60460b..79cf38206 100644
--- a/config/tls.m4
+++ b/config/tls.m4
@@ -11,8 +11,8 @@ AC_DEFUN([GCC_CHECK_TLS], [
       chktls_save_LDFLAGS="$LDFLAGS"
       LDFLAGS="-static $LDFLAGS"
       AC_LINK_IFELSE([int main() { return 0; }],
-	AC_RUN_IFELSE([__thread int a; int b; int main() { return a = b; }],
-		      [gcc_cv_have_tls=yes], [gcc_cv_have_tls=no],[]),
+	[AC_RUN_IFELSE([__thread int a; int b; int main() { return a = b; }],
+		       [gcc_cv_have_tls=yes], [gcc_cv_have_tls=no],[])],
 	[gcc_cv_have_tls=yes])
       LDFLAGS="$chktls_save_LDFLAGS"
       if test $gcc_cv_have_tls = yes; then