diff --git a/var/spack/repos/builtin/packages/r-mmwrweek/package.py b/var/spack/repos/builtin/packages/r-mmwrweek/package.py
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index 0000000000..4a5f3e7cdf
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+++ b/var/spack/repos/builtin/packages/r-mmwrweek/package.py
@@ -0,0 +1,40 @@
+##############################################################################
+# Copyright (c) 2013-2018, 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 RMmwrweek(RPackage):
+    """The first day of any MMWR week is Sunday. MMWR week numbering is
+    sequential beginning with 1 and incrementing with each week to a maximum
+    of 52 or 53. MMWR week #1 of an MMWR year is the first week of the year
+    that has at least four days in the calendar year. This package provides
+    functionality to convert Dates to MMWR day, week, and year and the
+    reverse."""
+
+    homepage = "https://cran.r-project.org/package=MMWRweek"
+    url      = "https://cran.r-project.org/src/contrib/MMWRweek_0.1.1.tar.gz"
+    list_url = "https://cran.r-project.org/src/contrib/Archive/MMWRweek"
+
+    version('0.1.1', 'a1245025126f8a96c72be8f7b06b0499')