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-rw-r--r--include/netinet/tcp.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/netinet/tcp.h b/include/netinet/tcp.h
index 6f75eb32..5212ef71 100644
--- a/include/netinet/tcp.h
+++ b/include/netinet/tcp.h
@@ -26,6 +26,7 @@
 #define TCP_REPAIR_OPTIONS 22
 #define TCP_FASTOPEN     23
 #define TCP_TIMESTAMP    24
+#define TCP_NOTSENT_LOWAT 25
 
 #define TCP_ESTABLISHED  1
 #define TCP_SYN_SENT     2