diff --git a/ChangeLog b/ChangeLog
index 173d8c00bc..79a51a390f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sun Feb 15 01:46:05 2004  GOTOU Yuuzou  <gotoyuzo@notwork.org>
+
+	* lib/mkmf.rb: absolute path of ruby is assigned to $(RUBY).
+	  [ruby-dev:22870]
+
 Sat Feb 14 11:29:41 2004  Masatoshi SEKI  <m_seki@mva.biglobe.ne.jp>
 
 	* sample/drb/*: import lib/drb/sample
diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index 45fc556ecd..a2dd735099 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -1004,7 +1004,7 @@ $configure_args["--topsrcdir"] ||= $srcdir
 Config::CONFIG["topdir"] = CONFIG["topdir"] =
   $curdir = arg_config("--curdir", Dir.pwd)
 $configure_args["--topdir"] ||= $curdir
-$ruby = arg_config("--ruby", CONFIG["ruby_install_name"])
+$ruby = arg_config("--ruby", File.join(CONFIG["bindir"], CONFIG["ruby_install_name"]))
 
 split = Shellwords.method(:shellwords).to_proc