--- a/configure.ac
+++ b/configure.ac
@@ -25,6 +25,9 @@
 AC_PROG_LN_S
 AC_PROG_MAKE_SET
 AC_PROG_RANLIB
+AC_PROG_MKDIR_P
+mkdir_p="${MKDIR_P}"
+AC_SUBST([mkdir_p])
 AC_PATH_PROGS(PERL, perl, /usr/local/bin/perl)
 AC_PATH_PROGS(NKF, nkf, /usr/local/bin/nkf)
 AC_PATH_PROGS(MAN, man, /usr/bin/man)
@@ -42,9 +45,8 @@
 AC_DEFINE_UNQUOTED(W3M_TARGET, $W3M_TARGET)
 
 AC_W3M_M17N
-if test x$enable_messagel10n = xno; then
- AM_GNU_GETTEXT([external])
-fi
+AM_GNU_GETTEXT_REQUIRE_VERSION([0.18])
+AM_GNU_GETTEXT([external])
 
 NLSTARGET=""
 if test x"$USE_NLS" = xyes; then