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-rw-r--r--include/zmq.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/zmq.h b/include/zmq.h
index 2c95219..cca7d01 100644
--- a/include/zmq.h
+++ b/include/zmq.h
@@ -185,7 +185,8 @@ ZMQ_EXPORT int zmq_term (void *context);
#define ZMQ_SNDTIMEO 28
#define ZMQ_RCVLABEL 29
#define ZMQ_RCVCMD 30
-
+#define ZMQ_IPV4ONLY 31
+
/* Send/recv options. */
#define ZMQ_DONTWAIT 1
#define ZMQ_SNDMORE 2