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diff --git a/src/recur.h b/src/recur.h
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+/* Declarations for recur.c.
+   Copyright (C) 1996-2011, 2015, 2018-2020 Free Software Foundation,
+   Inc.
+
+This file is part of GNU Wget.
+
+GNU Wget 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.
+
+GNU Wget 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 Wget.  If not, see <http://www.gnu.org/licenses/>.
+
+Additional permission under GNU GPL version 3 section 7
+
+If you modify this program, or any covered work, by linking or
+combining it with the OpenSSL project's OpenSSL library (or a
+modified version of that library), containing parts covered by the
+terms of the OpenSSL or SSLeay licenses, the Free Software Foundation
+grants you additional permission to convey the resulting work.
+Corresponding Source for a non-source form of such a combination
+shall include the source code for the parts of OpenSSL used as well
+as that of the covered work.  */
+
+#ifndef RECUR_H
+#define RECUR_H
+
+#include "url.h"
+
+/* For most options, 0 means no limits, but with -p in the picture,
+   that causes a problem on the maximum recursion depth variable.  To
+   retain backwards compatibility we allow users to consider "0" to be
+   synonymous with "inf" for -l, but internally infinite recursion is
+   specified by -1 and 0 means to only retrieve the requisites of a
+   single document. */
+#define INFINITE_RECURSION -1
+
+struct urlpos;
+
+void recursive_cleanup (void);
+uerr_t retrieve_tree (struct url *, struct iri *);
+
+#endif /* RECUR_H */