diff --git a/var/spack/repos/builtin/packages/r-bitops/package.py b/var/spack/repos/builtin/packages/r-bitops/package.py
new file mode 100644
index 0000000000..6399202aba
--- /dev/null
+++ b/var/spack/repos/builtin/packages/r-bitops/package.py
@@ -0,0 +1,42 @@
+##############################################################################
+# Copyright (c) 2013-2016, 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/llnl/spack
+# Please also see the LICENSE file 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 RBitops(Package):
+    """Functions for bitwise operations on integer vectors."""
+
+    homepage = "https://cran.r-project.org/package=bitops"
+    url      = "https://cran.r-project.org/src/contrib/bitops_1.0-6.tar.gz"
+    list_url = "https://cran.r-project.org/src/contrib/Archive/bitops"
+
+    version('1.0-6', 'fba16485a51b1ccd354abde5816b6bdd')
+
+    extends('R')
+
+    def install(self, spec, prefix):
+        R('CMD', 'INSTALL', '--library={0}'.format(self.module.r_lib_dir),
+          self.stage.source_path)
diff --git a/var/spack/repos/builtin/packages/r-c50/package.py b/var/spack/repos/builtin/packages/r-c50/package.py
new file mode 100644
index 0000000000..e9b582b52f
--- /dev/null
+++ b/var/spack/repos/builtin/packages/r-c50/package.py
@@ -0,0 +1,44 @@
+##############################################################################
+# Copyright (c) 2013-2016, 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/llnl/spack
+# Please also see the LICENSE file 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 RC50(Package):
+    """C5.0 decision trees and rule-based models for pattern recognition."""
+
+    homepage = "https://cran.r-project.org/package=C50"
+    url      = "https://cran.r-project.org/src/contrib/C50_0.1.0-24.tar.gz"
+    list_url = "https://cran.r-project.org/src/contrib/Archive/C50"
+
+    version('0.1.0-24', '42631e65c5c579532cc6edf5ea175949')
+
+    extends('R')
+
+    depends_on('r-partykit', type=nolink)
+
+    def install(self, spec, prefix):
+        R('CMD', 'INSTALL', '--library={0}'.format(self.module.r_lib_dir),
+          self.stage.source_path)