diff --git a/apps/shell/gui-shell.c b/apps/shell/gui-shell.c
index 3771538f4..19e8a5b0d 100644
--- a/apps/shell/gui-shell.c
+++ b/apps/shell/gui-shell.c
@@ -102,7 +102,7 @@ shell_prompt(char *str)
 }
 /*-----------------------------------------------------------------------------------*/
 void
-shell_exit(char *str)
+shell_exit(void)
 {
   ctk_window_close(&window);
 }
diff --git a/cpu/native/net/tapdev.c b/cpu/native/net/tapdev.c
index ecf018fcc..7386bdc96 100644
--- a/cpu/native/net/tapdev.c
+++ b/cpu/native/net/tapdev.c
@@ -69,6 +69,13 @@ static unsigned long lasttime;
 
 #define BUF ((struct uip_eth_hdr *)&uip_buf[0])
 
+#define DEBUG 0
+#if DEBUG
+#define PRINTF(...) fprintf(stderr, __VA_ARGS__)
+#else
+#define PRINTF(...)
+#endif
+
 /*---------------------------------------------------------------------------*/
 int
 tapdev_fd(void)
@@ -83,7 +90,7 @@ remove_route(void)
   char buf[1024];
   snprintf(buf, sizeof(buf), "route delete -net 172.18.0.0");
   system(buf);
-  printf("%s\n", buf);
+  fprintf(stderr, "%s\n", buf);
 
 }
 /*---------------------------------------------------------------------------*/
@@ -112,7 +119,7 @@ tapdev_init(void)
 
   snprintf(buf, sizeof(buf), "ifconfig tap0 inet 172.18.0.1/16");
   system(buf);
-  printf("%s\n", buf);
+  fprintf(stderr, "%s\n", buf);
 #ifdef linux
   /* route add for linux */
   snprintf(buf, sizeof(buf), "route add -net 172.18.0.0/16 dev tap0");
@@ -122,7 +129,7 @@ tapdev_init(void)
 #endif /* linux */
   
   system(buf);
-  printf("%s\n", buf);
+  fprintf(stderr, "%s\n", buf);
   atexit(remove_route);
 
   lasttime = 0;
@@ -149,6 +156,7 @@ tapdev_poll(void)
     return 0;
   }
   ret = read(fd, uip_buf, UIP_BUFSIZE);
+  PRINTF("tapdev_poll: read %d bytes\n", ret);
 
   if(ret == -1) {
     perror("tapdev_poll: read");
@@ -171,11 +179,12 @@ tapdev_send(void)
 #if DROP
   drop++;
   if(drop % 8 == 7) {
-    printf("Dropped an output packet!\n");
+    fprintf(stderr, "Dropped an output packet!\n");
     return;
   }
 #endif /* DROP */
 
+  PRINTF("tapdev_send: sending %d bytes\n", uip_len);
   ret = write(fd, uip_buf, uip_len);
 
   if(ret == -1) {
diff --git a/platform/native/clock.c b/platform/native/clock.c
index 2cfed7d23..4bf0389d4 100644
--- a/platform/native/clock.c
+++ b/platform/native/clock.c
@@ -46,9 +46,9 @@ clock_time_t
 clock_time(void)
 {
   struct timeval tv;
-   
+
   gettimeofday(&tv, NULL);
- 
+
   return tv.tv_sec * 1000 + tv.tv_usec / 1000;
 }
 /*---------------------------------------------------------------------------*/
@@ -56,9 +56,9 @@ unsigned long
 clock_seconds(void)
 {
   struct timeval tv;
-   
+
   gettimeofday(&tv, NULL);
- 
+
   return tv.tv_sec;
 }
 /*---------------------------------------------------------------------------*/
diff --git a/platform/native/contiki-main.c b/platform/native/contiki-main.c
index a870670cb..678d10073 100644
--- a/platform/native/contiki-main.c
+++ b/platform/native/contiki-main.c
@@ -221,9 +221,9 @@ main(int argc, char **argv)
 #endif
 
   serial_line_init();
-  
+
   autostart_start(autostart_processes);
-  
+
   /* Make standard output unbuffered. */
   setvbuf(stdout, (char *)NULL, _IONBF, 0);
 
@@ -271,12 +271,12 @@ main(int argc, char **argv)
 void
 log_message(char *m1, char *m2)
 {
-  printf("%s%s\n", m1, m2);
+  fprintf(stderr, "%s%s\n", m1, m2);
 }
 /*---------------------------------------------------------------------------*/
 void
 uip_log(char *m)
 {
-  printf("%s\n", m);
+  fprintf(stderr, "%s\n", m);
 }
 /*---------------------------------------------------------------------------*/
diff --git a/platform/native/dev/eeprom.c b/platform/native/dev/eeprom.c
index 040902354..e803b56fe 100644
--- a/platform/native/dev/eeprom.c
+++ b/platform/native/dev/eeprom.c
@@ -53,9 +53,9 @@ eeprom_write(eeprom_addr_t addr, unsigned char *buf, int size)
   lseek(f, addr, SEEK_SET);
   write(f, buf, size);
   close(f);
-  
+
   printf("eeprom_write(addr 0x%02x, buf %p, size %d);\n", addr, buf, size);
-  
+
   memcpy(&eeprom[addr], buf, size);
 }
 void
diff --git a/platform/native/dev/xmem.c b/platform/native/dev/xmem.c
index d1b5f2dc8..b95616049 100644
--- a/platform/native/dev/xmem.c
+++ b/platform/native/dev/xmem.c
@@ -56,9 +56,9 @@ xmem_pwrite(const void *buf, int size, unsigned long offset)
   lseek(f, addr, SEEK_SET);
   write(f, buf, size);
   close(f);*/
-  
+
   /*  printf("xmem_write(offset 0x%02x, buf %p, size %l);\n", offset, buf, size);*/
-  
+
   memcpy(&xmem[offset], buf, size);
   return size;
 }