--- a/ChangeLog	Sun Sep 28 16:12:20 2008 +0200
+++ b/ChangeLog	Sun Sep 28 16:17:51 2008 +0200
@@ -1,8 +1,14 @@
 2008-09-28  Bruno Haible  <bruno@clisp.org>
 
+	Override freopen more carefully.
+	* lib/freopen.c (orig_freopen): New function.
+	(rpl_freopen): Use orig_freopen instead of freopen.
+	* m4/freopen.m4 (gl_PREREQ_FREOPEN): New macro.
+	(gl_FUNC_FREOPEN): Invoke it.
+
 	Override fopen more carefully.
 	* lib/fopen.c (orig_fopen): New function.
-	(rpl_fopen): Use orig_fopen instead of open.
+	(rpl_fopen): Use orig_fopen instead of fopen.
 	* m4/fopen.m4 (gl_PREREQ_FOPEN): New macro.
 	(gl_FUNC_FOPEN): Invoke it.
 	Needed on AIX. Reported by Rainer Tammer <tammer@tammer.net>.

--- a/lib/freopen.c	Sun Sep 28 16:12:20 2008 +0200
+++ b/lib/freopen.c	Sun Sep 28 16:17:51 2008 +0200
@@ -1,5 +1,5 @@
 /* Open a stream to a file.
-   Copyright (C) 2007 Free Software Foundation, Inc.
+   Copyright (C) 2007-2008 Free Software Foundation, Inc.
 
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -18,6 +18,17 @@
 
 #include <config.h>
 
+/* Get the original definition of freopen.  It might be defined as a macro.  */
+#define __need_FILE
+#include <stdio.h>
+#undef __need_FILE
+
+static inline FILE *
+orig_freopen (const char *filename, const char *mode, FILE *stream)
+{
+  return freopen (filename, mode, stream);
+}
+
 /* Specification.  */
 #include <stdio.h>
 
@@ -25,12 +36,11 @@
 
 FILE *
 rpl_freopen (const char *filename, const char *mode, FILE *stream)
-#undef freopen
 {
 #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
   if (strcmp (filename, "/dev/null") == 0)
     filename = "NUL";
 #endif
 
-  return freopen (filename, mode, stream);
+  return orig_freopen (filename, mode, stream);
 }

--- a/m4/freopen.m4	Sun Sep 28 16:12:20 2008 +0200
+++ b/m4/freopen.m4	Sun Sep 28 16:17:51 2008 +0200
@@ -1,5 +1,5 @@
-# freopen.m4 serial 1
-dnl Copyright (C) 2007 Free Software Foundation, Inc.
+# freopen.m4 serial 2
+dnl Copyright (C) 2007-2008 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
@@ -12,6 +12,13 @@
     mingw* | pw*)
       REPLACE_FREOPEN=1
       AC_LIBOBJ([freopen])
+      gl_PREREQ_FREOPEN
       ;;
   esac
 ])
+
+# Prerequisites of lib/freopen.c.
+AC_DEFUN([gl_PREREQ_FREOPEN],
+[
+  AC_REQUIRE([AC_C_INLINE])
+])