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-rw-r--r--src/common.hh18
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diff --git a/src/common.hh b/src/common.hh
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+// -*- mode: c++; c-basic-offset: 2; -*-
+
+#ifndef COMMON_HH
+#define COMMON_HH
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#if HAVE_VAR_ATTRIBUTE_UNUSED
+# define UNUSED(x) __attribute__((unused)) x ## _unused
+#else
+# define UNUSED(x) x ## _unused
+#endif
+
+#include <cassert>
+
+#endif // COMMON_HH