diff --git a/ChangeLog b/ChangeLog
index 9ddac05695..076d0586e5 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Wed Aug  4 15:47:21 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
+
+	* lib/mkmf.rb (create_makefile): no need to create the directory
+	  at each library file. this change makes making ext faster.
+
 Wed Aug  4 06:25:04 2010  Tanaka Akira  <akr@fsij.org>
 
 	* ext/pathname/pathname.c (path_atime): Pathname#atime translated from
diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index 12d20bd582..9cec5f196c 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -1844,8 +1844,8 @@ static: $(STATIC_LIB)#{$extout ? " install-rb" : ""}
       end
       for f in files
 	dest = "#{dir}/#{File.basename(f)}"
-	mfile.print("install-rb#{sfx}: #{dest}\n")
-	mfile.print("#{dest}: #{f}\n\t@-$(MAKEDIRS) $(@D#{sep})\n")
+	mfile.print("install-rb#{sfx}: #{dest} #{dir}\n")
+	mfile.print("#{dest}: #{f}\n")
 	mfile.print("\t$(#{$extout ? 'COPY' : 'INSTALL_DATA'}) #{f} $(@D#{sep})\n")
 	if defined?($installed_list) and !$extout
 	  mfile.print("\t@echo #{dest}>>$(INSTALLED_LIST)\n")