diff --git a/setup b/setup
new file mode 100644
index 00000000..daac39c1
--- /dev/null
+++ b/setup
@@ -0,0 +1,8 @@
+#!/usr/bin/bash
+
+#----------------------------------------------------------------
+# This script is not for execute directly.
+# Please use 'source ./setup'.
+#----------------------------------------------------------------
+
+export TWLFIRM_ROOT=`cygpath -m $PWD`