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diff --git a/lib/c-strcase.h b/lib/c-strcase.h
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+/* Case-insensitive string comparison functions in C locale.
+   Copyright (C) 1995-1996, 2001, 2003, 2005, 2009-2012 Free Software
+   Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3, 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, see <http://www.gnu.org/licenses/>.  */
+
+#ifndef C_STRCASE_H
+#define C_STRCASE_H
+
+#include <stddef.h>
+
+
+/* The functions defined in this file assume the "C" locale and a character
+   set without diacritics (ASCII-US or EBCDIC-US or something like that).
+   Even if the "C" locale on a particular system is an extension of the ASCII
+   character set (like on BeOS, where it is UTF-8, or on AmigaOS, where it
+   is ISO-8859-1), the functions in this file recognize only the ASCII
+   characters.  More precisely, one of the string arguments must be an ASCII
+   string; the other one can also contain non-ASCII characters (but then
+   the comparison result will be nonzero).  */
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/* Compare strings S1 and S2, ignoring case, returning less than, equal to or
+   greater than zero if S1 is lexicographically less than, equal to or greater
+   than S2.  */
+extern int c_strcasecmp (const char *s1, const char *s2) _GL_ATTRIBUTE_PURE;
+
+/* Compare no more than N characters of strings S1 and S2, ignoring case,
+   returning less than, equal to or greater than zero if S1 is
+   lexicographically less than, equal to or greater than S2.  */
+extern int c_strncasecmp (const char *s1, const char *s2, size_t n)
+  _GL_ATTRIBUTE_PURE;
+
+
+#ifdef __cplusplus
+}
+#endif
+
+
+#endif /* C_STRCASE_H */