Thanks Clark, I found the same thing upon searching the issue, and replied to 
my post with the set of things I had to do to get this working.
Thanks,
Bryan Sullivan

> From: cboy...@sapwetik.org
> To: openstack-dev@lists.openstack.org
> Date: Thu, 7 Apr 2016 12:19:56 -0700
> Subject: Re: [openstack-dev] [Congress] Issues with Tox testing
> 
> On Thu, Apr 7, 2016, at 11:16 AM, Bryan Sullivan wrote:
> > Hi Congress team, 
> > 
> > A question for tox testing expert on the Congress team. I'm trying to run
> > the tox tests as described at https://github.com/openstack/congress,
> > specifically the two commands:
> > 
> > $ sudo pip install 'tox<1.7'
> > 
> > $ tox -epy27 
> > 
> > 
> > 
> > Due to conflicts with the OS-owned python config, I run these under my
> > virtualenv created in the congress repo as:
> > $ cd ~/git/congress
> > $ bin/pip  install 'tox<1.7'
> > $ bin/tox -epy27
> > 
> > 
> > But in any event (whether I try to run the tox within the virtualenv or
> > not), I get errors such as:
> >   c/_cffi_backend.c:15:17: fatal error: ffi.h: No such file or directory
> > 
> > 
> > 
> > What's missing in the setup for running these tests? 
> 
> This indicates you do not have the libffi development headers installed
> on your system. On debuntu they come in the libffi-dev package.
> 
> Clark
> 
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