added in linux commit 80b14dee2bea128928537d61c333f24cb8cbb62f
@@ -235,6 +235,8 @@ struct linger {
#define SCM_TIMESTAMPING_PKTINFO 58
#define SO_PEERGROUPS 59
#define SO_ZEROCOPY 60
+#define SO_TXTIME 61
+#define SCM_TXTIME SO_TXTIME
#ifndef SOL_SOCKET
#define SOL_SOCKET 1