diff --git a/ChangeLog b/ChangeLog
index e47238acb7..ccf50dc603 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,4 +1,7 @@
-Thu Nov 11 23:29:37 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+Thu Nov 11 23:32:10 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* configure.in (AC_C_CONST, AC_C_INLINE, AC_C_VOLATILE): check
+	  before used in other checks.
 
 	* configure.in (RUBY_CHECK_PRINTF_PREFIX): should not break from
 	  RUBY_WERROR_FLAG, so that ac_c_werror_flag gets restored.
diff --git a/configure.in b/configure.in
index 953c56e41d..b8b4478abc 100644
--- a/configure.in
+++ b/configure.in
@@ -479,6 +479,12 @@ cat largefile.h >> confdefs.h
 
 AS_CASE(["$target_os"],[mingw*], [ac_cv_type_off_t=yes;ac_cv_sizeof_off_t=8])
 
+AC_C_BIGENDIAN
+AC_C_CONST
+AC_C_CHAR_UNSIGNED
+AC_C_INLINE
+AC_C_VOLATILE
+
 AC_CHECK_TYPES([long long, off_t])
 
 AC_CACHE_CHECK([char bit], [rb_cv_char_bit],
@@ -1535,12 +1541,6 @@ if test "$ac_cv_func_setpgid:$ac_cv_func_setpgrp" = no:yes; then
 AC_FUNC_SETPGRP
 fi
 
-AC_C_BIGENDIAN
-AC_C_CONST
-AC_C_CHAR_UNSIGNED
-AC_C_INLINE
-AC_C_VOLATILE
-
 if test x"$target_cpu" = xia64; then
     AC_LIBOBJ([ia64])
     AC_CACHE_CHECK(for __libc_ia64_register_backing_store_base,