diff --git a/ChangeLog b/ChangeLog
index 845b178e9f..1e18edac8c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Wed Feb 28 18:31:51 2007  NAKAMURA Usaku  <usa@ruby-lang.org>
+
+	* ext/openssl/extconf.rb: no need to check unistd.h and sys/time.h.
+	  they are already checked at configure.
+	  reported by KOBAYASHI Yasuhiro [ruby-list:43225]
+
 Wed Feb 28 18:23:43 2007  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* lib/mkmf.rb ($DEFLIBPATH): default library paths ($(topdir), etc)
diff --git a/ext/openssl/extconf.rb b/ext/openssl/extconf.rb
index 11f74ff3d8..98921bc468 100644
--- a/ext/openssl/extconf.rb
+++ b/ext/openssl/extconf.rb
@@ -36,8 +36,6 @@ end
 message "=== Checking for system dependent stuff... ===\n"
 have_library("nsl", "t_open")
 have_library("socket", "socket")
-have_header("unistd.h")
-have_header("sys/time.h")
 have_header("assert.h")
 
 message "=== Checking for required stuff... ===\n"