+dnl m4/hgrev.m4
+dnl
+dnl Copyright (C) 2010
+dnl CACAOVM - Verein zur Foerderung der freien virtuellen Maschine CACAO
+dnl
+dnl This file is part of CACAO.
+dnl
+dnl This program is free software; you can redistribute it and/or
+dnl modify it under the terms of the GNU General Public License as
+dnl published by the Free Software Foundation; either version 2, or (at
+dnl your option) any later version.
+dnl
+dnl This program is distributed in the hope that it will be useful, but
+dnl WITHOUT ANY WARRANTY; without even the implied warranty of
+dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+dnl General Public License for more details.
+dnl
+dnl You should have received a copy of the GNU General Public License
+dnl along with this program; if not, write to the Free Software
+dnl Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+dnl 02110-1301, USA.
+
+
+dnl Mercurial revision
+
+AC_DEFUN([AC_CHECK_WITH_HGREV],[
+AC_MSG_CHECKING(for the Mercurial revision)
+AC_ARG_WITH([hg-revision],
+ [AS_HELP_STRING(--with-hg-revision=<hash>, the Mercurial revision used for this CACAO build)],
+ [CACAO_HGREV=${withval}])
+AC_MSG_RESULT(${CACAO_HGREV-not specified})
+AC_DEFINE_UNQUOTED([CACAO_HGREV], "${CACAO_HGREV}", [CACAO's Mercurial revision])
+AC_SUBST(CACAO_HGREV)
+])