#error netinet/in.h not found in the system
#endif
+#ifdef HAVE_XTI_H
+#include <xti.h>
+#else
#ifdef HAVE_NETINET_TCP_H
#include <netinet/tcp.h>
#else
-#error netinet/tcp.h not found in the system
+#error xti.h nor even netinet/tcp.h found in the system
+#endif
#endif
#ifdef HAVE_NETDB_H