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diff --git a/lib/c32tolower.c b/lib/c32tolower.c
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+/* Map a 32-bit wide character to lowercase.
+ Copyright (C) 2023 Free Software Foundation, Inc.
+
+ This file is free software.
+ It is dual-licensed under "the GNU LGPLv3+ or the GNU GPLv2+".
+ You can redistribute it and/or modify it under either
+ - the terms of the GNU Lesser General Public License as published
+ by the Free Software Foundation, either version 3, or (at your
+ option) any later version, or
+ - the terms of the GNU General Public License as published by the
+ Free Software Foundation; either version 2, or (at your option)
+ any later version, or
+ - the same dual license "the GNU LGPLv3+ or the GNU GPLv2+".
+
+ This file 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 and the GNU General Public License
+ for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License and of the GNU General Public License along with this
+ program. If not, see <https://www.gnu.org/licenses/>. */
+
+#include <config.h>
+
+#define IN_C32TOLOWER
+/* Specification. */
+#include <uchar.h>
+
+#define FUNC c32tolower
+#define WCHAR_FUNC towlower
+#define UCS_FUNC uc_tolower
+#include "c32to-impl.h"