diff --git a/var/spack/repos/builtin/packages/r-dirichletmultinomial/package.py b/var/spack/repos/builtin/packages/r-dirichletmultinomial/package.py
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+##############################################################################
+# Copyright (c) 2013-2017, Lawrence Livermore National Security, LLC.
+# Produced at the Lawrence Livermore National Laboratory.
+#
+# This file is part of Spack.
+# Created by Todd Gamblin, tgamblin@llnl.gov, All rights reserved.
+# LLNL-CODE-647188
+#
+# For details, see https://github.com/spack/spack
+# Please also see the NOTICE and LICENSE files for our notice and the LGPL.
+#
+# This program 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) version 2.1, February 1999.
+#
+# 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 terms and
+# conditions of 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 program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+##############################################################################
+from spack import *
+
+
+class RDirichletmultinomial(RPackage):
+    """Dirichlet-multinomial mixture models can be used to describe
+    variability in microbial metagenomic data.
+
+    This package is an interface to code originally made available by
+    Holmes, Harris, and Quince, 2012, PLoS ONE 7(2): 1-15, as discussed
+    further in the man page for this package, ?DirichletMultinomial."""
+
+    homepage = "https://bioconductor.org/packages/DirichletMultinomial/"
+    url      = "https://git.bioconductor.org/packages/DirichletMultinomial"
+
+    version('1.20.0', git='https://git.bioconductor.org/packages/DirichletMultinomial', commit='251529f301da1482551142240aeb6baf8dab2272')
+
+    depends_on('r-s4vectors', type=('build', 'run'))
+    depends_on('r-iranges', type=('build', 'run'))
+    depends_on('gsl')
+    depends_on('r@3.4.0:')