check for netinet/tcp.h precense before actually including it

configure.ac

@@ -1001,6 +1001,7 @@ AC_CHECK_HEADERS(
         arpa/inet.h \
         net/if.h \
         netinet/in.h \
+        netinet/tcp.h \
         netdb.h \
         sys/sockio.h \
         sys/stat.h \

lib/connect.c

@@ -31,6 +31,8 @@
 #endif
 #ifdef HAVE_SYS_SOCKET_H
 #include <sys/socket.h>
+#endif
+#ifdef HAVE_NETINET_TCP_H
 #include <netinet/tcp.h> /* for TCP_NODELAY */
 #endif
 #include <sys/ioctl.h>