--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,17 @@
+2011-09-05  Paul Eggert  <eggert@cs.ucla.edu>
+
+	openat: port to AIX 7.1 with large files
+	AIX 7.1 does a "#define openat open64at" if large files are in use,
+	so we can't simply #undef openat.  Use the orig_openat trick (similar
+	to orig_open in lib/open.c) to work around the problem.  Problem
+	reported by Kevin Brott for GNU tar, in the thread containing
+	<http://lists.gnu.org/archive/html/bug-tar/2011-09/msg00032.html>.
+	* lib/openat.c (__need_system_fcntl_h): Define first.
+	Include <fcntl.h> and <sys/types.h> before undefining.
+	(orig_openat) [HAVE_OPENAT]: New inline function.
+	(openat) [HAVE_OPENAT]: Do not undef.
+	(rpl_openat): Use orig_openat, not openat.
+
 2011-09-05  Joachim Schmitz  <schmitz@hp.com>  (tiny change)
             Bruno Haible  <bruno@clisp.org>
 

--- a/lib/openat.c
+++ b/lib/openat.c
@@ -16,8 +16,25 @@
 
 /* written by Jim Meyering */
 
+/* If the user's config.h happens to include <fcntl.h>, let it include only
+   the system's <fcntl.h> here, so that orig_openat doesn't recurse to
+   rpl_openat.  */
+#define __need_system_fcntl_h
 #include <config.h>
 
+/* Get the original definition of open.  It might be defined as a macro.  */
+#include <fcntl.h>
+#include <sys/types.h>
+#undef __need_system_fcntl_h
+
+#if HAVE_OPENAT
+static inline int
+orig_openat (int fd, char const *filename, int flags, mode_t mode)
+{
+  return openat (fd, filename, flags, mode);
+}
+#endif
+
 #include "openat.h"
 
 #include <stdarg.h>
@@ -31,8 +48,6 @@
 
 #if HAVE_OPENAT
 
-# undef openat
-
 /* Like openat, but work around Solaris 9 bugs with trailing slash.  */
 int
 rpl_openat (int dfd, char const *filename, int flags, ...)
@@ -86,7 +101,7 @@
     }
 # endif
 
-  fd = openat (dfd, filename, flags, mode);
+  fd = orig_openat (dfd, filename, flags, mode);
 
 # if OPEN_TRAILING_SLASH_BUG
   /* If the filename ends in a slash and fd does not refer to a directory,