Fix for #59334
  - error: use of undeclared identifier 'unused'

--- include/bmon/bmon.h.orig
+++ include/bmon/bmon.h
@@ -67,6 +67,11 @@ enum {
 #define __unused__
 #endif

+/* #59334 */
+#ifdef __APPLE__
+#define __unused __attribute__ ((unused))
+#endif
+
 #ifdef DEBUG
 #define DBG(FMT, ARG...)					\
 	do {							\