$ spack install -v flecsale~mpi
==> cmake is already installed in /home/christoph/spack/opt/spack/linux-gentoo2-x86_64/gcc-5.4.0/cmake-3.8.0-mxszhy7n2aao2rejkicyhm2ldauubp4v
==> openssl is already installed in /home/christoph/spack/opt/spack/linux-gentoo2-x86_64/gcc-5.4.0/openssl-1.0.2k-uttx77sulhg24jo6eicwifq53zawszhu
==> flecsi is already installed in /home/christoph/spack/opt/spack/linux-gentoo2-x86_64/gcc-5.4.0/flecsi-develop-6b7as7rgqm2ebvpth3ys3dh4p4r7dkfc
==> python is already installed in /home/christoph/spack/opt/spack/linux-gentoo2-x86_64/gcc-5.4.0/python-2.7.13-3zqpzkmzcthq24sqm36rl4yaxovuwic6
==> Installing flecsale
==> Error: AttributeError: 'dict' object has no attribute 'iteritems'
/home/christoph/spack/var/spack/repos/builtin/packages/python/package.py:393, in setup_dependent_package:
     375      def setup_dependent_package(self, module, dependent_spec):
     376          """Called before python modules' install() methods.
     377  
     378          In most cases, extensions will only need to have one line::
     379  
     380          setup_py('install', '--prefix={0}'.format(prefix))"""
     381          python_path = join_path(
     382              self.spec.prefix.bin,
     383              'python{0}'.format('3' if self.spec.satisfies('@3') else '')
     384          )
     385  
     386          module.python_exe = python_path
     387          module.python = Executable(python_path)
     388          module.setup_py = Executable(python_path + ' setup.py --no-user-cfg')
     389  
     390          distutil_vars = self._load_distutil_vars()
     391  
     392          if distutil_vars:
  >> 393              for key, value in distutil_vars.iteritems():
     394                  module.setup_py.add_default_env(key, value)
     395  
     396          # Add variables for lib/pythonX.Y and lib/pythonX.Y/site-packages dirs.
     397          module.python_lib_dir = join_path(dependent_spec.prefix,
     398                                            self.python_lib_dir)
     399          module.python_include_dir = join_path(dependent_spec.prefix,
     400                                                self.python_include_dir)
     401          module.site_packages_dir = join_path(dependent_spec.prefix,
     402                                               self.site_packages_dir)
     403  
     404          # Make the site packages directory for extensions
     405          if dependent_spec.package.is_extension:
     406              mkdirp(module.site_packages_dir)