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+Tue Oct 27 08:56:11 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* mkconfig.rb: reverted r25443 because build_os is used in mkmf.rb
+	  on some platforms.  [ruby-core:26332]
+
 Tue Oct 27 07:53:25 2009  Yukihiro Matsumoto  <matz@ruby-lang.org>
 
 	* gc.c (garbage_collect_with_gvl): do not garbage_collect when