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diff --git a/src/nat/gnunet-service-nat.h b/src/nat/gnunet-service-nat.h
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+++ b/src/nat/gnunet-service-nat.h
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+/*
+  This file is part of GNUnet.
+  Copyright (C) 2016, 2017 GNUnet e.V.
+
+  GNUnet 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.
+
+  GNUnet 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 GNUnet; see the file COPYING.  If not, write to the
+  Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+  Boston, MA 02110-1301, USA.
+ */
+
+/**
+ * @file nat/gnunet-service-nat.h
+ * @brief network address translation traversal service
+ * @author Christian Grothoff
+ */
+#ifndef GNUNET_SERVICE_NAT_H
+#define GNUNET_SERVICE_NAT_H
+
+/**
+ * Is UPnP enabled? #GNUNET_YES if enabled, #GNUNET_NO if disabled,
+ * #GNUNET_SYSERR if configuration enabled but binary is unavailable.
+ */
+extern int enable_upnp;
+
+#endif