Make use of the UIP_TCPIP_HLEN define where it applies.
diff --git a/contiki-win32/uip/rawsock.c b/contiki-win32/uip/rawsock.c
index dcecec4..cb59097 100644
--- a/contiki-win32/uip/rawsock.c
+++ b/contiki-win32/uip/rawsock.c
@@ -192,8 +192,8 @@
static unsigned long on = 1;
struct sockaddr_in addr;
DWORD dummy;
- WSABUF sendbuf[2] = {{ 40, uip_buf},
- {uip_len - 40, uip_appdata}};
+ WSABUF sendbuf[2] = {{ UIP_TCPIP_HLEN, uip_buf},
+ {uip_len - UIP_TCPIP_HLEN, uip_appdata}};
if(ioctlsocket(rawsock, FIONBIO, &off) == SOCKET_ERROR) {
error_exit("ioctlsocket(!FIONBIO) error: %d\n", WSAGetLastError());