Fixed includes

core/contiki-net.h

@@ -44,6 +44,7 @@
 #include "net/uip_arp.h"
 #include "net/uiplib.h"
 #include "net/uip-udp-packet.h"
+#include "net/simple-udp.h"
 
 #if UIP_CONF_IPV6
 #include "net/uip-icmp6.h"

core/net/simple-udp.c

@@ -41,8 +41,11 @@
  *
  */
 
-#include "simple-udp.h"
 #include "contiki-net.h"
+#include "net/simple-udp.h"
+
+#include <stdlib.h>
+
 
 PROCESS(simple_udp_process, "Simple UDP process");
 static uint8_t started = 0;