--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
 2009-06-29  Bruno Haible  <bruno@clisp.org>
 
+	New module 'unicase/u32-ct-tolower'.
+	* lib/unicase/u32-ct-tolower.c: New file.
+	* modules/unicase/u32-ct-tolower: New file.
+
 	New module 'unicase/u16-ct-tolower'.
 	* lib/unicase/u16-ct-tolower.c: New file.
 	* modules/unicase/u16-ct-tolower: New file.

new file mode 100644
--- /dev/null
+++ b/lib/unicase/u32-ct-tolower.c
@@ -0,0 +1,40 @@
+/* Lowercase mapping for UTF-32 substrings (locale dependent).
+   Copyright (C) 2009 Free Software Foundation, Inc.
+   Written by Bruno Haible <bruno@clisp.org>, 2009.
+
+   This program is free software: you can redistribute it and/or modify it
+   under the terms of the GNU Lesser General Public License as published
+   by the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include "unicase.h"
+
+#include <stddef.h>
+
+#include "unicasemap.h"
+#include "special-casing.h"
+
+uint32_t *
+u32_ct_tolower (const uint32_t *s, size_t n,
+		casing_prefix_context_t prefix_context,
+		casing_suffix_context_t suffix_context,
+		const char *iso639_language,
+		uninorm_t nf,
+		uint32_t *resultbuf, size_t *lengthp)
+{
+  return u32_casemap (s, n, prefix_context, suffix_context, iso639_language,
+		      uc_tolower, offsetof (struct special_casing_rule, lower[0]),
+		      nf,
+		      resultbuf, lengthp);
+}

new file mode 100644
--- /dev/null
+++ b/modules/unicase/u32-ct-tolower
@@ -0,0 +1,26 @@
+Description:
+Lowercase mapping for UTF-32 substrings (locale dependent).
+
+Files:
+lib/unicase/u32-ct-tolower.c
+
+Depends-on:
+unicase/base
+unicase/u8-casemap
+unicase/special-casing
+unicase/toupper
+
+configure.ac:
+
+Makefile.am:
+lib_SOURCES += unicase/u32-ct-tolower.c
+
+Include:
+"unicase.h"
+
+License:
+LGPL
+
+Maintainer:
+Bruno Haible
+