diff --git a/cpu/native/net/linuxradio-drv.c b/cpu/native/net/linuxradio-drv.c
index e9760d604..a2be32940 100644
--- a/cpu/native/net/linuxradio-drv.c
+++ b/cpu/native/net/linuxradio-drv.c
@@ -43,6 +43,7 @@
 #include "net/packetbuf.h"
 #include "net/netstack.h"
 
+#include <stdlib.h>
 #include <stdio.h>
 #include <sys/ioctl.h>
 #include <string.h>
diff --git a/cpu/native/net/tapdev.c b/cpu/native/net/tapdev.c
index e58b3c475..b60cd1946 100644
--- a/cpu/native/net/tapdev.c
+++ b/cpu/native/net/tapdev.c
@@ -93,8 +93,11 @@ static void
 remove_route(void)
 {
   char buf[1024];
+  int ret;
+
   snprintf(buf, sizeof(buf), "route delete -net 172.18.0.0");
-  system(buf);
+  ret = system(buf);
+  fprintf(stderr, "ret %d\n", ret);
   fprintf(stderr, "%s\n", buf);
 
 }
@@ -103,7 +106,8 @@ void
 tapdev_init(void)
 {
   char buf[1024];
-  
+  int ret;
+
   fd = open(DEVTAP, O_RDWR);
   if(fd == -1) {
     perror("tapdev: tapdev_init: open");
@@ -123,7 +127,8 @@ tapdev_init(void)
 #endif /* Linux */
 
   snprintf(buf, sizeof(buf), "ifconfig tap0 inet 172.18.0.1/16");
-  system(buf);
+  ret = system(buf);
+  fprintf(stderr, "ret %d\n", ret);
   fprintf(stderr, "%s\n", buf);
 #ifdef linux
   /* route add for linux */
@@ -132,8 +137,9 @@ tapdev_init(void)
   /* route add for freebsd */
   snprintf(buf, sizeof(buf), "route add -net 172.18.0.0/16 -iface tap0");
 #endif /* linux */
-  
-  system(buf);
+
+  ret = system(buf);
+  fprintf(stderr, "ret %d\n", ret);
   fprintf(stderr, "%s\n", buf);
   atexit(remove_route);