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diff --git a/libs/tgl/libevent/defer-internal.h b/libs/tgl/libevent/defer-internal.h
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+/*
+ * Copyright (c) 2009-2012 Niels Provos and Nick Mathewson
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#ifndef DEFER_INTERNAL_H_INCLUDED_
+#define DEFER_INTERNAL_H_INCLUDED_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "event2/event-config.h"
+#include "evconfig-private.h"
+
+#include <sys/queue.h>
+
+struct event_callback;
+typedef void (*deferred_cb_fn)(struct event_callback *, void *);
+
+/**
+ Initialize an empty, non-pending event_callback.
+
+ @param deferred The struct event_callback structure to initialize.
+ @param priority The priority that the callback should run at.
+ @param cb The function to run when the struct event_callback executes.
+ @param arg The function's second argument.
+ */
+void event_deferred_cb_init_(struct event_callback *, ev_uint8_t, deferred_cb_fn, void *);
+/**
+ Change the priority of a non-pending event_callback.
+ */
+void event_deferred_cb_set_priority_(struct event_callback *, ev_uint8_t);
+/**
+ Cancel a struct event_callback if it is currently scheduled in an event_base.
+ */
+void event_deferred_cb_cancel_(struct event_base *, struct event_callback *);
+/**
+ Activate a struct event_callback if it is not currently scheduled in an event_base.
+
+ Return true if it was not previously scheduled.
+ */
+int event_deferred_cb_schedule_(struct event_base *, struct event_callback *);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* EVENT_INTERNAL_H_INCLUDED_ */
+