Comment out extend_stack() -- it is no longer needed.
diff --git a/Objects/frameobject.c b/Objects/frameobject.c
index 9d80e1f..e416b4f 100644
--- a/Objects/frameobject.c
+++ b/Objects/frameobject.c
@@ -238,6 +238,7 @@
 	return f;
 }
 
+#if 0
 object **
 extend_stack(f, level, incr)
 	frameobject *f;
@@ -254,6 +255,7 @@
 	}
 	return f->f_valuestack + level;
 }
+#endif
 
 /* Block management */