diff --git a/extern_function.ink b/extern_function.ink
index 285c9c4..7394bf2 100644
--- a/extern_function.ink
+++ b/extern_function.ink
@@ -2,3 +2,15 @@ EXTERNAL console_log(x)
 EXTERNAL obtained_ending(name)
 EXTERNAL new_ending(name)
 EXTERNAL clear_ending()
+
+=== function obtained_ending(name) ===
+~ return false
+
+=== function new_ending(name) ===
+~ return
+
+=== function clear_ending() ===
+~ return
+
+=== function console_log(x) ===
+~ return