diff --git a/m4/argz.m4 b/m4/argz.m4
new file mode 100644
index 0000000..66f3bc1
--- /dev/null
+++ b/m4/argz.m4
@@ -0,0 +1,43 @@
+# Portability macros for glibc argz.                    -*- Autoconf -*-
+# Written by Gary V. Vaughan <gary@gnu.org>
+
+# Copyright (C) 2004  Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+# 02111-1307, USA.
+
+# serial 1
+
+AC_DEFUN([gl_FUNC_ARGZ],
+[gl_PREREQ_ARGZ
+
+AC_CHECK_HEADERS([argz.h], [], [], [AC_INCLUDES_DEFAULT])
+
+AC_CHECK_TYPES([error_t],
+  [],
+  [AC_DEFINE([error_t], [int],
+   [Define to a type to use for `error_t' if it is not otherwise available.])],
+  [#if defined(HAVE_ARGZ_H)
+#  include <argz.h>
+#endif])
+
+ARGZ_H=
+AC_CHECK_FUNCS([argz_append argz_create_sep argz_insert argz_next \
+	argz_stringify], [], [ARGZ_H=argz.h; AC_LIBOBJ([argz])])
+AC_SUBST([ARGZ_H])
+])
+
+# Prerequisites of lib/argz.c.
+AC_DEFUN([gl_PREREQ_ARGZ], [:])