Add 'if __name__ == "__main__":' to files already as a usable as a module.
diff --git a/Demo/scripts/mkrcs.py b/Demo/scripts/mkrcs.py
index 45a68b9..cacdda0 100755
--- a/Demo/scripts/mkrcs.py
+++ b/Demo/scripts/mkrcs.py
@@ -57,4 +57,5 @@
         makedirs(head)
         os.mkdir(p, 0777)
 
-main()
+if __name__ == "__main__":
+    main()