Jinja2 with Django 1.8c1 & cannot import name 'Environment'

Does anybody see what I may be doing wrong here?

I followed this example:
https://github.com/aaugustin/mtefd/blob/master/multiple-template-engines.rst#jinja2-backend


The project is at:
/www/pbs_site

/www/pbs_site$ python manage.py check
System check identified no issues (0 silenced).

##### Error #####

ImportError at /

cannot import name 'Environment'

Request Method: GET
Request URL: http://127.0.0.1:8000/
Django Version: 1.8c1
Exception Type: ImportError
Exception Value:

cannot import name 'Environment'

Exception Location: /www/pbs_site/jinja2.py in <module>, line 4
Python Executable: /www/pbs-venv/bin/python
Python Version: 3.4.3
Python Path:

['/www/pbs_site',
'/www/pbs_site/pbs_site',
'/www/pbs-venv/bin',
'/usr/local/lib/python34.zip',
'/www/Python-3.4.3/Lib',
'/www/Python-3.4.3/Lib/plat-linux',
'/www/Python-3.4.3/build/lib.linux-i686-3.4',
'/www/pbs-venv/lib/python3.4/site-packages']

Server time: Fri, 27 Mar 2015 11:19:56 -0500

##### Code #####

/www/pbs_site$ grep ^TEMPLATES -A 23 pbs_site/settings.py
TEMPLATES = [
{
'BACKEND': 'django.template.backends.django.DjangoTemplates',
'DIRS': [],
'APP_DIRS': True,
'OPTIONS': {
'context_processors': [
'django.template.context_processors.debug',
'django.template.context_processors.request',
'django.contrib.auth.context_processors.auth',
'django.contrib.messages.context_processors.messages',
],
},
},
{
'BACKEND': 'django.template.backends.jinja2.Jinja2',
'NAME': 'jinja2',
'DIRS': [],
'APP_DIRS': False,
'OPTIONS': {
'environment': 'jinja2.Environment',
},
},
]

/www/pbs_site$ cat jinja2.py
from django.contrib.staticfiles.storage import staticfiles_storage
from django.core.urlresolvers import reverse

from jinja2 import Environment


def environment(**options):
env = Environment(**options)
env.globals.update({
'static': staticfiles_storage.url,
'url': reverse,
})
return env

--
Rolf

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