define __unused to nothing if not already defined

fixes builds on BSD/OS

1 files changed, 4 insertions, 0 deletions

diff --git a/defines.h b/defines.h
index fa0ccba7..cf65901d 100644
--- a/defines.h
+++ b/defines.h
@@ -850,4 +850,8 @@ struct winsize {
 # endif /* gcc version */
 #endif /* __predict_true */
 
+#ifndef __unused
+# define __unused
+#endif
+
 #endif /* _DEFINES_H */