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+Sat Apr 13 23:06:20 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* lib/mkmf.rb (timestamp_file): gather timestamp files in one
+	  directory from each extension directories.
+
 Sat Apr 13 21:09:02 2013  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* lib/mkmf.rb (MakeMakefile#create_makefile): output new macro