Ooops, I think I commented on the wrong Makefile. I meant tlayer:
```
diff --git tlayer/Makefile tlayer/Makefile
index 0b0e32b..5902fac 100644
--- tlayer/Makefile
+++ tlayer/Makefile
@@ -46,7 +46,7 @@ USEMODULE += uart0
 USEMODULE += posix
 USEMODULE += ltc4150
 
-export INCLUDES += -I$(RIOTBASE)/sys/include -I$(RIOTBASE)/drivers/include -I$(RIOTBASE)/drivers/cc110x_ng/include -I$(RIOTBASE)/sys/net/include
+export INCLUDES += -I$(RIOTBASE)/sys/include -I$(RIOTBASE)/drivers/include -I$(RIOTBASE)/drivers/cc110x_ng/include -I$(RIOTBASE)/sys/net/include -I$(RIOTBASE)/sys/net/destiny
 
 include $(RIOTBASE)/Makefile.include
 endif
diff --git tlayer/tlayer_shell.c tlayer/tlayer_shell.c
index 341b33c..d59943e 100644
--- tlayer/tlayer_shell.c
+++ tlayer/tlayer_shell.c
@@ -14,7 +14,7 @@
 #include "destiny/socket.h"
 
 #include "net_help.h"
-#include "../msg_help.h"
+#include "msg_help.h"
 
 #include "tlayer.h"
```