diff --git a/ChangeLog b/ChangeLog
index 7aed21ce63..8062d97eb3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,4 +1,7 @@
-Mon Apr 23 22:09:17 2007  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+Mon Apr 23 22:14:42 2007  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* ext/extmk.rb ($ruby): add extout directory to include path.
+	  [ruby-core:11003]
 
 	* lib/mkmf.rb (libpathflag): not to append RPATHFLAG to current
 	  directory.
diff --git a/ext/extmk.rb b/ext/extmk.rb
index 290fef9d56..15d2abb608 100644
--- a/ext/extmk.rb
+++ b/ext/extmk.rb
@@ -323,6 +323,7 @@ else
   $ruby = '$(topdir)/miniruby' + EXEEXT
 end
 $ruby << " -I'$(topdir)' -I'$(hdrdir)/lib'"
+$ruby << " -I'#{$extout}'" if $extout
 $config_h = '$(topdir)/config.h'
 
 MTIMES = [__FILE__, 'rbconfig.rb', srcdir+'/lib/mkmf.rb'].collect {|f| File.mtime(f)}