diff --git a/ChangeLog b/ChangeLog
index 97c8d24423..57beea86fc 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Thu Feb 28 21:33:01 2013  WATANABE Hirofumi  <eban@ruby-lang.org>
+
+	* configure.in(AC_DISABLE_OPTION_CHECKING): avoid warning "WARNING:
+	  Unrecognized options: --with-PACKAGE".
+
 Thu Feb 28 20:22:04 2013  Koichi Sasada  <ko1@atdot.net>
 
 	* iseq.c (iseq_data_to_ary): fix condition.
diff --git a/configure.in b/configure.in
index 19fa23e2a9..4d6d6ed037 100644
--- a/configure.in
+++ b/configure.in
@@ -3,12 +3,14 @@ AC_INIT()
 {
 AC_CONFIG_AUX_DIR(tool)
 
-AC_PREREQ(2.60)
+AC_PREREQ(2.62)
 
 AC_DEFUN([RUBY_PREREQ_AC],
 	[m4_if(m4_version_compare(m4_defn([m4_PACKAGE_VERSION]), [$1]), [-1],
 		AC_MSG_ERROR([Autoconf version ]$1[ or higher is required]$2))])
 
+AC_DISABLE_OPTION_CHECKING
+
 { # environment section
 
 AC_ARG_WITH(baseruby,