--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,13 @@
+2008-09-04  Ralf Wildenhues  <Ralf.Wildenhues@gmx.de>
+            Bruno Haible  <bruno@clisp.org>
+
+	Make gnulib-tool work with native 'sed' on AIX.
+	* gnulib-tool (sed_noop): New variable.
+	(func_emit_lib_Makefile_am, func_emit_tests_Makefile_am, func_import,
+	func_add_or_update, func_create_testdir): Use it to initialize sed
+	script variables.
+	Reported by Albert Chin <bug-gnulib@mlists.thewrittenword.com>.
+
 2008-09-04  Albert Chin  <bug-gnulib@mlists.thewrittenword.com>
             Bruno Haible  <bruno@clisp.org>
 

--- a/gnulib-tool
+++ b/gnulib-tool
@@ -83,6 +83,10 @@
   alias sed='sed --posix'
 fi
 
+# sed_noop is a sed expression that does nothing.
+# An empty expression does not with the native 'sed' on AIX 6.1.
+sed_noop='s,x,x,'
+
 # func_usage
 # outputs to stdout the --help usage message.
 func_usage ()
@@ -1672,7 +1676,7 @@
   if test "$libtool" = true; then
     libext=la
     perhapsLT=LT
-    sed_eliminate_LDFLAGS=
+    sed_eliminate_LDFLAGS="$sed_noop"
   else
     libext=a
     perhapsLT=
@@ -1685,7 +1689,7 @@
     # situation. Turn check_PROGRAMS into noinst_PROGRAMS.
     sed_transform_check_PROGRAMS='s,check_PROGRAMS,noinst_PROGRAMS,g'
   else
-    sed_transform_check_PROGRAMS=
+    sed_transform_check_PROGRAMS="$sed_noop"
   fi
   echo "## DO NOT EDIT! GENERATED AUTOMATICALLY!"
   echo "## Process this file with automake to produce Makefile.in."
@@ -1897,7 +1901,7 @@
 {
   if test "$libtool" = true; then
     libext=la
-    sed_eliminate_LDFLAGS=
+    sed_eliminate_LDFLAGS="$sed_noop"
   else
     libext=a
     sed_eliminate_LDFLAGS='/^lib_LDFLAGS[	 ]*+=/d'
@@ -1909,7 +1913,7 @@
     # situation. Turn check_PROGRAMS into noinst_PROGRAMS.
     sed_transform_check_PROGRAMS='s,check_PROGRAMS,noinst_PROGRAMS,g'
   else
-    sed_transform_check_PROGRAMS=
+    sed_transform_check_PROGRAMS="$sed_noop"
   fi
   testsbase_inverse=`echo "$testsbase" | sed -e 's,/$,,' | sed -e 's,[^/][^/]*,..,g'`
   echo "## DO NOT EDIT! GENERATED AUTOMATICALLY!"
@@ -3153,7 +3157,7 @@
           ba
         }'
     else
-      sed_replace_build_aux=
+      sed_replace_build_aux="$sed_noop"
     fi
     func_emit_initmacro_start $macro_prefix
     echo "  gl_source_base='$sourcebase'"
@@ -3830,7 +3834,7 @@
          ba
        }'
    else
-     sed_replace_build_aux=
+     sed_replace_build_aux="$sed_noop"
    fi
    func_emit_initmacro_start $macro_prefix
    echo "gl_source_base='$sourcebase'"