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diff --git a/gl/m4/fcntl-o.m4 b/gl/m4/fcntl-o.m4
index d416a61..1adacc8 100644
--- a/gl/m4/fcntl-o.m4
+++ b/gl/m4/fcntl-o.m4
@@ -1,4 +1,4 @@
1# fcntl-o.m4 serial 1 1# fcntl-o.m4 serial 2
2dnl Copyright (C) 2006, 2009-2010 Free Software Foundation, Inc. 2dnl Copyright (C) 2006, 2009-2010 Free Software Foundation, Inc.
3dnl This file is free software; the Free Software Foundation 3dnl This file is free software; the Free Software Foundation
4dnl gives unlimited permission to copy and/or distribute it, 4dnl gives unlimited permission to copy and/or distribute it,
@@ -12,7 +12,11 @@ dnl Written by Paul Eggert.
12AC_DEFUN([gl_FCNTL_O_FLAGS], 12AC_DEFUN([gl_FCNTL_O_FLAGS],
13[ 13[
14 dnl Persuade glibc <fcntl.h> to define O_NOATIME and O_NOFOLLOW. 14 dnl Persuade glibc <fcntl.h> to define O_NOATIME and O_NOFOLLOW.
15 AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS]) 15 dnl AC_USE_SYSTEM_EXTENSIONS was introduced in autoconf 2.60 and obsoletes
16 dnl AC_GNU_SOURCE.
17 m4_ifdef([AC_USE_SYSTEM_EXTENSIONS],
18 [AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])],
19 [AC_REQUIRE([AC_GNU_SOURCE])])
16 AC_CACHE_CHECK([for working fcntl.h], [gl_cv_header_working_fcntl_h], 20 AC_CACHE_CHECK([for working fcntl.h], [gl_cv_header_working_fcntl_h],
17 [AC_RUN_IFELSE( 21 [AC_RUN_IFELSE(
18 [AC_LANG_PROGRAM( 22 [AC_LANG_PROGRAM(