diff --git a/lib/spack/spack/version.py b/lib/spack/spack/version.py
index 247f6d2362fd85266ca1f861c7912b43bbf1ff91..d86bcef3e06ba3e3e226db01cd1f6dbb2cfc0d9c 100644
--- a/lib/spack/spack/version.py
+++ b/lib/spack/spack/version.py
@@ -124,6 +124,17 @@ def __init__(self, string):
         # last element of separators is ''
         self.separators = tuple(re.split(segment_regex, string)[1:-1])
 
+    @property
+    def dotted(self):
+        return '.'.join(str(x) for x in self.version)
+
+    @property
+    def underscored(self):
+        return '_'.join(str(x) for x in self.version)
+
+    @property
+    def dashed(self):
+        return '-'.join(str(x) for x in self.version)
 
     def up_to(self, index):
         """Return a version string up to the specified component, exclusive.
diff --git a/var/spack/repos/builtin/packages/lmod/package.py b/var/spack/repos/builtin/packages/lmod/package.py
index 0a8b9b4577daf7839bc9a4cad04fbe242012fa8e..9084c3488120fa566256e6d9fb6da39732f224cf 100644
--- a/var/spack/repos/builtin/packages/lmod/package.py
+++ b/var/spack/repos/builtin/packages/lmod/package.py
@@ -34,17 +34,17 @@ class Lmod(Package):
     variable. Modulefiles for Library packages provide environment variables
     that specify where the library and header files can be found.
     """
-    homepage = "https://www.tacc.utexas.edu/research-development/tacc-projects/lmod"
-    url      = "http://sourceforge.net/projects/lmod/files/Lmod-6.0.1.tar.bz2/download"
+    homepage = 'https://www.tacc.utexas.edu/research-development/tacc-projects/lmod'
+    url = 'https://github.com/TACC/Lmod/archive/6.4.1.tar.gz'
 
+    version('6.4.1', '7978ba777c8aa41a4d8c05fec5f780f4')
+    version('6.3.7', '0fa4d5a24c41cae03776f781aa2dedc1', preferred=True)
     version('6.0.1', '91abf52fe5033bd419ffe2842ebe7af9')
 
-    depends_on("lua@5.2:")
+    depends_on('lua@5.2:')
+    depends_on('lua-luaposix')
+    depends_on('lua-luafilesystem')
 
     def install(self, spec, prefix):
-        # Add our lua to PATH
-        os.environ['PATH'] = spec['lua'].prefix.bin + ';' + os.environ['PATH']
-        
         configure('--prefix=%s' % prefix)
-        make()
-        make("install")
+        make('install')
diff --git a/var/spack/repos/builtin/packages/lua-luafilesystem/package.py b/var/spack/repos/builtin/packages/lua-luafilesystem/package.py
new file mode 100644
index 0000000000000000000000000000000000000000..14278bbe724a9a873edc093e7d61963a7ec2105d
--- /dev/null
+++ b/var/spack/repos/builtin/packages/lua-luafilesystem/package.py
@@ -0,0 +1,46 @@
+##############################################################################
+# 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 LuaLuafilesystem(Package):
+    """
+    LuaFileSystem is a Lua library developed to complement the set of functions related to file
+    systems offered by the standard Lua distribution.
+
+    LuaFileSystem offers a portable way to access the underlying directory structure and file attributes. LuaFileSystem
+    is free software and uses the same license as Lua 5.1
+    """
+    homepage = 'http://keplerproject.github.io/luafilesystem'
+    url = 'https://github.com/keplerproject/luafilesystem/archive/v_1_6_3.tar.gz'
+
+    version('1_6_3', 'd0552c7e5a082f5bb2865af63fb9dc95')
+
+    extends('lua')
+
+    def install(self, spec, prefix):
+        version = self.spec.version
+        rockspec_format = join_path(self.stage.path, 'luafilesystem-v_{version.underscored}', 'rockspecs', 'luafilesystem-{version.dotted}-1.rockspec')
+        luarocks('--tree=' + prefix, 'install', rockspec_format.format(version=self.spec.version))
\ No newline at end of file
diff --git a/var/spack/repos/builtin/packages/lua/package.py b/var/spack/repos/builtin/packages/lua/package.py
index 170f90516ab140ea54880052113f9c23dd1832bf..320e25899ea0ff792c50afc572bda04129f898b8 100644
--- a/var/spack/repos/builtin/packages/lua/package.py
+++ b/var/spack/repos/builtin/packages/lua/package.py
@@ -105,6 +105,9 @@ def setup_dependent_environment(self, spack_env, run_env, extension_spec):
         spack_env.set('LUA_PATH', ';'.join(lua_patterns), separator=';')
         spack_env.set('LUA_CPATH', ';'.join(lua_cpatterns), separator=';')
 
+        # Add LUA to PATH for dependent packages
+        spack_env.prepend_path('PATH', self.prefix.bin)
+
         # For run time environment set only the path for extension_spec and
         # prepend it to LUAPATH
         if extension_spec.package.extends(self.spec):
@@ -153,5 +156,4 @@ def setup_dependent_package(self, module, ext_spec):
         """
         # Lua extension builds can have lua and luarocks executable functions
         module.lua = Executable(join_path(self.spec.prefix.bin, 'lua'))
-        module.luarocks = Executable(join_path(self.spec.prefix.bin,
-                                               'luarocks'))
+        module.luarocks = Executable(join_path(self.spec.prefix.bin, 'luarocks'))