diff --git a/ChangeLog b/ChangeLog
index 195ebb309a..f905ac5a5a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Wed Jul 15 06:21:50 2009  Hidetoshi NAGAI  <nagai@ai.kyutech.ac.jp>
+
+	* ext/tk/extconf.rb: --with-{tcl,tk}-dir doesn't work.[ruby-dev:38782]
+
 Wed Jul 15 04:22:54 2009  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* test/cgi/test_cgi_multipart.rb (CGIMultipartTest#_prepare):
diff --git a/ext/tk/extconf.rb b/ext/tk/extconf.rb
index 7d2853a37b..193e41b2dc 100644
--- a/ext/tk/extconf.rb
+++ b/ext/tk/extconf.rb
@@ -1173,8 +1173,8 @@ if TkLib_Config["tcltk-framework"]
 end
 
 # search Tcl/Tk libraries
-tk_idir,  tk_ldir  = dir_config("tk")  if with_config('tk')
-tcl_idir, tcl_ldir = dir_config("tcl") if with_config('tcl')
+tk_idir,  tk_ldir  = dir_config("tk")
+tcl_idir, tcl_ldir = dir_config("tcl")
 
 tk_ldir2  = with_config("tk-lib")
 tcl_ldir2 = with_config("tcl-lib")