--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,22 @@
+2007-01-24  Bruno Haible  <bruno@clisp.org>
+
+	Don't AC_REQUIRE autoconf macros that invoke AC_LIBOBJ. See
+	<http://lists.gnu.org/archive/html/bug-gnulib/2006-10/msg00279.html>.
+	* m4/argp.m4 (gl_ARGP): Invoke, don't require, gl_GETOPT_SUBSTITUTE.
+	* m4/fts.m4 (gl_FUNC_FTS, gl_FUNC_FTS_LGPL): Invoke, don't require,
+	gl_FUNC_FTS_CORE.
+	(gl_FUNC_FTS_CORE): Invoke, don't require, gl_FUNC_OPENAT.
+	* m4/lstat.m4 (gl_FUNC_LSTAT): Invoke, don't require,
+	AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK.
+	* m4/memcmp.m4 (gl_FUNC_MEMCMP): Invoke, don't require, AC_FUNC_MEMCMP.
+	* m4/mktime.m4 (gl_FUNC_MKTIME): Invoke, don't require, AC_FUNC_MKTIME.
+	* m4/openat.m4 (gl_FUNC_OPENAT): Invoke, don't require,
+	gl_FUNC_FCHOWNAT.
+	* m4/strftime.m4 (gl_FUNC_GNU_STRFTIME): Invoke, don't require,
+	gl_FUNC_STRFTIME.
+	* m4/strtod.m4 (gl_FUNC_STRTOD): Invoke, don't require, AC_FUNC_STRTOD.
+	Reported by Ralf Wildenhues.
+
 2007-01-24  Bruno Haible  <bruno@clisp.org>
 
 	Drop AC_REQUIRE calls that are redundant with the module dependencies.

--- a/m4/argp.m4
+++ b/m4/argp.m4
@@ -1,5 +1,5 @@
-# argp.m4 serial 7
-dnl Copyright (C) 2003-2006 Free Software Foundation, Inc.
+# argp.m4 serial 8
+dnl Copyright (C) 2003-2007 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.
@@ -9,7 +9,10 @@
   AC_REQUIRE([AC_C_INLINE])
   AC_REQUIRE([AC_C_RESTRICT])
   AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
-  AC_REQUIRE([gl_GETOPT_SUBSTITUTE])
+  dnl argp-parse.c depends on GNU getopt internals, therefore use GNU getopt
+  dnl always.
+  gl_GETOPT_SUBSTITUTE
+  dnl Note: gl_GETOPT_SUBSTITUTE does AC_LIBOBJ(getopt), AC_LIBOBJ(getopt1).
 
   AC_CHECK_DECL([program_invocation_name],
                 [AC_DEFINE(HAVE_DECL_PROGRAM_INVOCATION_NAME, 1,

--- a/m4/fts.m4
+++ b/m4/fts.m4
@@ -1,4 +1,4 @@
-#serial 12
+#serial 13
 dnl Copyright (C) 2005-2007 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -6,12 +6,12 @@
 
 AC_DEFUN([gl_FUNC_FTS],
 [
-  AC_REQUIRE([gl_FUNC_FTS_CORE])
+  gl_FUNC_FTS_CORE
 ])
 
 AC_DEFUN([gl_FUNC_FTS_LGPL],
 [
-  AC_REQUIRE([gl_FUNC_FTS_CORE])
+  gl_FUNC_FTS_CORE
 ])
 
 AC_DEFUN([gl_FUNC_FTS_CORE],
@@ -21,7 +21,7 @@
   AC_LIBOBJ([fts])
 
   dnl Prerequisites of lib/fts.c.
-  AC_REQUIRE([gl_FUNC_OPENAT])
+  gl_FUNC_OPENAT
 
   # Checks for header files.
   AC_CHECK_HEADERS_ONCE([sys/param.h])dnl

--- a/m4/lstat.m4
+++ b/m4/lstat.m4
@@ -1,6 +1,6 @@
-#serial 15
+#serial 16
 
-# Copyright (C) 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2005, 2006
+# Copyright (C) 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2005, 2006, 2007
 # Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
@@ -11,7 +11,7 @@
 
 AC_DEFUN([gl_FUNC_LSTAT],
 [
-  AC_REQUIRE([AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK])
+  AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK
   dnl Note: AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK does AC_LIBOBJ(lstat).
   :
 ])

--- a/m4/memcmp.m4
+++ b/m4/memcmp.m4
@@ -1,12 +1,13 @@
-# memcmp.m4 serial 11
-dnl Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
+# memcmp.m4 serial 12
+dnl Copyright (C) 2002, 2003, 2004, 2007 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.
 
 AC_DEFUN([gl_FUNC_MEMCMP],
 [
-  AC_REQUIRE([AC_FUNC_MEMCMP])
+  AC_FUNC_MEMCMP
+  dnl Note: AC_FUNC_MEMCMP does AC_LIBOBJ(memcmp).
   if test $ac_cv_func_memcmp_working = no; then
     AC_DEFINE(memcmp, rpl_memcmp,
       [Define to rpl_memcmp if the replacement function should be used.])

--- a/m4/mktime.m4
+++ b/m4/mktime.m4
@@ -1,4 +1,4 @@
-#serial 11
+#serial 12
 dnl Copyright (C) 2002, 2003, 2005, 2006, 2007 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -211,7 +211,8 @@
 
 AC_DEFUN([gl_FUNC_MKTIME],
 [
-  AC_REQUIRE([AC_FUNC_MKTIME])
+  AC_FUNC_MKTIME
+  dnl Note: AC_FUNC_MKTIME does AC_LIBOBJ(mktime).
   if test $ac_cv_func_working_mktime = no; then
     AC_DEFINE(mktime, rpl_mktime,
       [Define to rpl_mktime if the replacement function should be used.])

--- a/m4/openat.m4
+++ b/m4/openat.m4
@@ -1,4 +1,4 @@
-#serial 14
+#serial 15
 # See if we need to use our replacement for Solaris' openat et al functions.
 
 dnl Copyright (C) 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
@@ -24,7 +24,7 @@
       [Define to rpl_ if the openat replacement function should be used.])
     gl_PREREQ_OPENAT;;
   esac
-  AC_REQUIRE([gl_FUNC_FCHOWNAT])
+  gl_FUNC_FCHOWNAT
 ])
 
 # gl_FUNC_FCHOWNAT_DEREF_BUG([ACTION-IF-BUGGY[, ACTION-IF-NOT_BUGGY]])

--- a/m4/strftime.m4
+++ b/m4/strftime.m4
@@ -1,4 +1,4 @@
-#serial 28
+#serial 29
 
 # Copyright (C) 1996, 1997, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
 # 2006, 2007 Free Software Foundation, Inc.
@@ -10,7 +10,8 @@
 # Written by Jim Meyering and Paul Eggert.
 
 AC_DEFUN([gl_FUNC_GNU_STRFTIME],
-[AC_REQUIRE([gl_FUNC_STRFTIME])dnl
+[
+  gl_FUNC_STRFTIME
 ])
 
 # These are the prerequisite macros for GNU's strftime.c replacement.

--- a/m4/strtod.m4
+++ b/m4/strtod.m4
@@ -1,12 +1,13 @@
-# strtod.m4 serial 5
-dnl Copyright (C) 2002, 2003, 2006 Free Software Foundation, Inc.
+# strtod.m4 serial 6
+dnl Copyright (C) 2002, 2003, 2006, 2007 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.
 
 AC_DEFUN([gl_FUNC_STRTOD],
 [
-  AC_REQUIRE([AC_FUNC_STRTOD])
+  AC_FUNC_STRTOD
+  dnl Note: AC_FUNC_STRTOD does AC_LIBOBJ(strtod).
   if test $ac_cv_func_strtod = no; then
     AC_DEFINE(strtod, rpl_strtod,
       [Define to rpl_strtod if the replacement function should be used.])