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diff --git a/src/kwset.h b/src/kwset.h
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+/* kwset.h - header declaring the keyword set library.
+   Copyright (C) 1989, 1998, 2005, 2007, 2009-2016 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, write to the Free Software
+   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
+   02110-1301, USA.  */
+
+/* Written August 1989 by Mike Haertel.
+   The author may be reached (Email) at the address mike@ai.mit.edu,
+   or (US mail) as Mike Haertel c/o Free Software Foundation. */
+
+#include <stddef.h>
+
+struct kwsmatch
+{
+  size_t index;			/* Index number of matching keyword. */
+  size_t offset[1];		/* Offset of each submatch. */
+  size_t size[1];		/* Length of each submatch. */
+};
+
+#include "arg-nonnull.h"
+
+struct kwset;
+typedef struct kwset *kwset_t;
+
+/* Return an opaque pointer to a newly allocated keyword set.  A nonnull arg
+   specifies a table of character translations to be applied to all
+   pattern and search text.  */
+extern kwset_t kwsalloc (char const *);
+
+/* Incrementally extend the keyword set to include the given string.
+   Remember an index number for each keyword included in the set.  */
+extern void kwsincr (kwset_t, char const *, size_t);
+
+/* When the keyword set has been completely built, prepare it for use.  */
+extern void kwsprep (kwset_t);
+
+/* Search through the given buffer for a member of the keyword set.
+   Return a pointer to the leftmost longest match found, or NULL if
+   no match is found.  If foundlen is non-NULL, store the length of
+   the matching substring in the integer it points to.  Similarly,
+   if foundindex is non-NULL, store the index of the particular
+   keyword found therein. */
+extern size_t kwsexec (kwset_t, char const *, size_t, struct kwsmatch *)
+  _GL_ARG_NONNULL ((4));
+
+/* Deallocate the given keyword set and all its associated storage. */
+extern void kwsfree (kwset_t);