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diff --git a/util/macros.h b/util/macros.h
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+++ b/util/macros.h
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+/*
+ * Some standard helpful macros.
+ *
+ * Written by Russ Allbery <rra@stanford.edu>
+ * This work is hereby placed in the public domain by its author.
+ */
+
+#ifndef UTIL_MACROS_H
+#define UTIL_MACROS_H 1
+
+#include <config.h>
+#include <portable/macros.h>
+
+/* Used for unused parameters to silence gcc warnings. */
+#define UNUSED __attribute__((__unused__))
+
+#endif /* UTIL_MACROS_H */