diff --git a/ChangeLog b/ChangeLog
index e995a7f76e..1ff2f28acd 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,9 +1,11 @@
-Sat Dec 15 18:56:57 2007  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+Sat Dec 15 20:20:48 2007  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* configure.in (enc/Makefile): add external encoding objects list.
 
 	* common.mk (BUILTIN_ENCOBJS): renamed from ENCOBJS.
 
+	* configure.in (BUILTIN_ENCS): [] needs to be enclosed because of m4.
+
 	* Makefile.in (BUILTIN_ENCOBJS): substitued by autoconf.
 
 	* enc/Makefile.in: new file to compile external encoding sources.
diff --git a/configure.in b/configure.in
index fb0994cb60..db7e959d04 100644
--- a/configure.in
+++ b/configure.in
@@ -1736,7 +1736,7 @@ fi
 tr -d '\015' < largefile.h > confdefs.h
 
 test -d enc || mkdir enc
-BUILTIN_ENCS="`sed -n '/^BUILTIN_ENCS[ 	]*=/{s///;:l;/\\\\$/N;s/\\\\\\n/ /;t l;p}' \"${srcdir}/enc/Makefile.in\"`"
+BUILTIN_ENCS=["`sed -n '/^BUILTIN_ENCS[ 	]*=/{s///;:l;/\\\\$/N;s/\\\\\\n/ /;t l;p}' \"${srcdir}/enc/Makefile.in\"`"]
 BUILTIN_ENCS="`echo $BUILTIN_ENCS`"
 EXTERNAL_ENCS=
 for e in "${srcdir}/enc"/*.c; do