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+# ===========================================================================
+# http://autoconf-archive.cryp.to/acltx_class_article.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+# ACLTX_CLASS_ARTICLE([ACTION-IF-NOT-FOUND])
+#
+# DESCRIPTION
+#
+# This macro test if class article is installed and fail (default) with a
+# error message if not
+#
+# LICENSE
+#
+# Copyright (c) 2008 Boretti Mathieu <boretti@eig.unige.ch>
+#
+# This library is free software; you can redistribute it and/or modify it
+# under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation; either version 2.1 of the License, or (at
+# your option) any later version.
+#
+# This library 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 Lesser
+# General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with this library. If not, see <http://www.gnu.org/licenses/>.
+
+AC_DEFUN([ACLTX_CLASS_ARTICLE],[
+ACLTX_CLASS(article,article,[],[m4_ifval([$1],[$1],AC_MSG_ERROR([Unable to find the article class]))])])
+])