diff --git a/ChangeLog b/ChangeLog
index ce97f6c4ea..94f03c5cbb 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Mon Apr 11 15:24:20 2005  NAKAMURA Usaku  <usa@ruby-lang.org>
+
+	* lib/mkmf.rb (configuration): shouldn't output hdrdir twice.
+
 Sat Apr  9 18:20:31 2005  Hidetoshi NAGAI  <nagai@ai.kyutech.ac.jp>
 
 	* ext/tk/lib/tk/image.rb: support to create TkImage object without
diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index a9561cc7a5..07017597ca 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -862,7 +862,7 @@ VPATH = #{vpath.join(CONFIG['PATH_SEPARATOR'])}
   end
   CONFIG.each do |key, var|
     next if /^abs_/ =~ key
-    next unless /^(?:src|top|(.*))dir$/ =~ key and $1
+    next unless /^(?:src|top|hdr|(.*))dir$/ =~ key and $1
     mk << "#{key} = #{with_destdir(var.sub(drive, ''))}\n"
   end
   mk << %{