--- /dev/null
+/*
+ * a subset of FreeBSD's netinet/tcp.h
+ */
+#ifndef _NETINET_TCP_H_
+#define _NETINET_TCP_H_
+
+#define TH_FIN 0x01
+#define TH_SYN 0x02
+#define TH_RST 0x04
+#define TH_PUSH 0x08
+#define TH_ACK 0x10
+#define TH_URG 0x20
+
+#endif /* _NETINET_TCP_H_ */