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diff --git a/util.h b/util.h
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+++ b/util.h
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+/*********************************************************************
+ * kd-forest                                                         *
+ * Copyright (C) 2014 Tavian Barnes <tavianator@tavianator.com>      *
+ *                                                                   *
+ * This program is free software. It comes without any warranty, to  *
+ * the extent permitted by applicable law. You can redistribute it   *
+ * and/or modify it under the terms of the Do What The Fuck You Want *
+ * To Public License, Version 2, as published by Sam Hocevar. See    *
+ * the COPYING file or http://www.wtfpl.net/ for more details.       *
+ *********************************************************************/
+
+#ifndef UTIL_H
+#define UTIL_H
+
+#include <stddef.h>
+
+void *xmalloc(size_t size);
+void *xrealloc(void *ptr, size_t size);
+
+#endif // UTIL_H