Jinja2 Environment option "lstrip_blocks" produces TypeError

I am using Ubuntu 12.04, python 3.2.3 and jinja2 2.6-1. When passing the option lstrip_blocks to the Environment as follows, I get this error `"**TypeError: \__init__() got an unexpected keyword argument 'lstrip_blocks'**"` ``` from jinja2 import Environment, PackageLoader env = Environment(loader=PackageLoader('jinja2_hello','.'),lstrip_blocks=True) template = env.get_template('template_hello.html') output = template.render() print(output) ``` The template `template_hello.html` contains only: ``` hello ``` The other option 'trim_blocks`, alone, works perfectly. Would you have any suggestions to solve this. I haven't been able to fix it. Thanks