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-rw-r--r--ext/socket/rubysocket.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/ext/socket/rubysocket.h b/ext/socket/rubysocket.h
index a4fced8ca4..8beffd2e76 100644
--- a/ext/socket/rubysocket.h
+++ b/ext/socket/rubysocket.h
@@ -39,6 +39,9 @@
# ifdef HAVE_NETINET_TCP_H
# include <netinet/tcp.h>
# endif
+# ifdef HAVE_NETINET_TCP_FSM_H
+# include <netinet/tcp_fsm.h>
+# endif
# ifdef HAVE_NETINET_UDP_H
# include <netinet/udp.h>
# endif