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diff --git a/lib/autoconf/autoscan.m4 b/lib/autoconf/autoscan.m4
new file mode 100644
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+++ b/lib/autoconf/autoscan.m4
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+# This file is part of Autoconf.                       -*- Autoconf -*-
+# Interface with autoscan.
+
+# Copyright (C) 2002, 2009-2012 Free Software Foundation, Inc.
+
+# This file is part of Autoconf.  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 3 of the License, 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.
+#
+# Under Section 7 of GPL version 3, you are granted additional
+# permissions described in the Autoconf Configure Script Exception,
+# version 3.0, as published by the Free Software Foundation.
+#
+# You should have received a copy of the GNU General Public License
+# and a copy of the Autoconf Configure Script Exception along with
+# this program; see the files COPYINGv3 and COPYING.EXCEPTION
+# respectively.  If not, see <http://www.gnu.org/licenses/>.
+
+# Written by Akim Demaille.
+
+# The prefix `AN' is chosen after `AutoscaN'.
+
+# AN_OUTPUT(KIND, WORD, MACROS)
+# -----------------------------
+# Declare that the WORD, used as a KIND, requires triggering the MACROS.
+m4_define([AN_OUTPUT], [])
+
+
+# AN_FUNCTION(NAME, MACROS)
+# AN_HEADER(NAME, MACROS)
+# AN_IDENTIFIER(NAME, MACROS)
+# AN_LIBRARY(NAME, MACROS)
+# AN_MAKEVAR(NAME, MACROS)
+# AN_PROGRAM(NAME, MACROS)
+# ---------------------------
+# If the FUNCTION/HEADER etc. is used in the package, then the MACROS
+# should be invoked from configure.ac.
+m4_define([AN_FUNCTION],   [AN_OUTPUT([function], $@)])
+m4_define([AN_HEADER],     [AN_OUTPUT([header], $@)])
+m4_define([AN_IDENTIFIER], [AN_OUTPUT([identifier], $@)])
+m4_define([AN_LIBRARY],    [AN_OUTPUT([library], $@)])
+m4_define([AN_MAKEVAR],    [AN_OUTPUT([makevar], $@)])
+m4_define([AN_PROGRAM],    [AN_OUTPUT([program], $@)])