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diff --git a/lib/quote.h b/lib/quote.h
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+/* quote.h - prototypes for quote.c
+
+   Copyright (C) 1998-2001, 2003, 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 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 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 QUOTE_H_
+# define QUOTE_H_ 1
+
+/* The quoting options used by quote_n and quote.  Its type is incomplete,
+   so it's useful only in expressions like '&quote_quoting_options'.  */
+extern struct quoting_options quote_quoting_options;
+
+/* Return an unambiguous printable representation of NAME,
+   allocated in slot N, suitable for diagnostics.  */
+char const *quote_n (int n, char const *name);
+
+/* Return an unambiguous printable representation of NAME,
+   suitable for diagnostics.  */
+char const *quote (char const *name);
+
+#endif /* !QUOTE_H_ */