diff --git a/library/Native_Functions.ttcn b/library/Native_Functions.ttcn
new file mode 100644
index 0000000..ac62161
--- /dev/null
+++ b/library/Native_Functions.ttcn
@@ -0,0 +1,4 @@
+module Native_Functions {
+
+	external function f_inet_addr(in charstring ch) return octetstring;
+}