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+Sun May 31 23:28:00 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* lib/mkmf.rb (create_makefile): checks for duplication of source
+	  files.
+
 Sun May 31 23:26:36 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* file.c (istrailinggarbage): fixed typo.