diff --git a/ChangeLog b/ChangeLog
index 8d04472ba3..ac00821d05 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Tue Nov 23 06:30:18 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* configure.in (rubylibprefix): No ruby, No libprefix.
+
 Tue Nov 23 06:26:26 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* ChangeLog (change-log-indent-text): hunging indent.
diff --git a/configure.in b/configure.in
index af5274dbc5..2286988926 100644
--- a/configure.in
+++ b/configure.in
@@ -2612,7 +2612,10 @@ AS_CASE(["$target_os"],
 rubylibprefix='${libdir}/${RUBY_BASE_NAME}'
 AC_ARG_WITH(rubylibprefix,
 	    AS_HELP_STRING([--with-rubylibprefix=DIR], [prefix for ruby libraries [[LIBDIR/RUBY_BASE_NAME]]]),
-	    [rubylibprefix=$withval])
+	    [if test "x$withval" = xno; then
+		AC_MSG_ERROR([No ruby, No libprefix])
+	    fi
+	    rubylibprefix"=$withval"])
 RUBY_LIB_PREFIX=`eval echo \\"${rubylibprefix}\\"`
 AC_SUBST(rubylibprefix)