diff --git a/ChangeLog b/ChangeLog
index 62d750480b..73f23f1e29 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Mon Dec 28 13:18:52 2009  Yuki Sonoda (Yugui)  <yugui@yugui.jp>
+
+	* tool/install-sh: wrote the intention. [ruby-dev:39928]
+
 Sun Dec 27 10:45:00 2009  Masaki Suketa <masaki.suketa@nifty.ne.jp>
 
 	* ext/win32ole/win32ole.c (foleparam_initialize): add foleparam_initialize
diff --git a/tool/install-sh b/tool/install-sh
old mode 100755
new mode 100644
index e69de29bb2..a5d118598f
--- a/tool/install-sh
+++ b/tool/install-sh
@@ -0,0 +1,17 @@
+#!/bin/sh
+
+# Just only for using AC_PROG_INSTALL in configure.in.
+# See autoconf.info for more detail.
+
+cat <<EOF >&2
+Ruby tries to use a BSD-compatible install(1) if possible. However Ruby 
+has its own install(1) alternative.
+
+This script is necessary just for using AC_PROG_INSTALL in configure.in, 
+however, it will not executed. So this script just fails.
+Please report a bug of Ruby to http://redmine.ruby-lang.org if you meet
+this message.
+
+Thank you.
+EOF
+exit 1