Add missing dependencies for Flake8 (#1883)

* Warn user if flake8 can't find setuptools

* Add missing dependencies of flake8

* Updates to py-autopep8, make packages activateable

* Check for presence of setuptools for Sphinx too

* Fix bug in order of commands

var/spack/repos/builtin/packages/py-enum34/package.py

@@ -0,0 +1,45 @@
+##############################################################################
+# 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 PyEnum34(Package):
+    """Python 3.4 Enum backported to 3.3, 3.2, 3.1, 2.7, 2.6, 2.5, and 2.4."""
+
+    homepage = "https://pypi.python.org/pypi/enum34"
+    url      = "https://pypi.python.org/packages/source/e/enum34/enum34-1.1.6.tar.gz"
+
+    version('1.1.6', '5f13a0841a61f7fc295c514490d120d0',
+            url="https://pypi.python.org/packages/bf/3e/31d502c25302814a7c2f1d3959d2a3b3f78e509002ba91aea64993936876/enum34-1.1.6.tar.gz")
+
+    extends('python')
+    depends_on('python@2.4:2.8,3.3:')
+
+    depends_on('py-ordereddict', when='^python@:2.6.999', type=nolink)
+
+    depends_on('py-setuptools', type='build')
+
+    def install(self, spec, prefix):
+        setup_py('install', '--prefix={0}'.format(prefix))