diff --git a/ChangeLog b/ChangeLog
index 31ca78e7b0..a1738bdf96 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sun Apr 13 03:20:31 2003  WATANABE Hirofumi  <eban@ruby-lang.org>
+
+	* lib/mkmf.rb (try_func): remove COMMON_HEADERS at first for
+	  performance.
+
 Sat Apr 12 20:59:40 2003  Nobuyoshi Nakada  <nobu.nokada@softhome.net>
 
 	* misc/ruby-mode.el (ruby-beginning-of-arg): substitute
diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index 4ae477ff48..a9f061df89 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -262,7 +262,6 @@ end
 def try_func(func, libs, headers = nil)
   headers = cpp_include(headers)
   try_link(<<"SRC", libs) or try_link(<<"SRC", libs)
-#{COMMON_HEADERS}
 #{headers}
 int main() { return 0; }
 int t() { #{func}(); return 0; }