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-rw-r--r--include/zmq.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/zmq.h b/include/zmq.h
index f4d2656..857fec7 100644
--- a/include/zmq.h
+++ b/include/zmq.h
@@ -193,6 +193,7 @@ ZMQ_EXPORT int zmq_term (void *context);
#define ZMQ_TYPE 16
#define ZMQ_LINGER 17
#define ZMQ_RECONNECT_IVL 18
+#define ZMQ_BACKLOG 19
/* Send/recv options. */
#define ZMQ_NOBLOCK 1