[Tutor] cffi version mismatch stalling pip install pygit2

[MR ZenWiz]

How do I fix this?

We are using a newer version of libgit2 than the standard release
(libgit2.0.25.0 instead of libgit2.0.24.0 - some hard dependency in
our code).

However, after I install libgit2 (25), I get this error chain:

pip install pygit2
Collecting pygit2
  Using cached pygit2-0.25.1.tar.gz
    Complete output from command python setup.py egg_info:
    /usr/lib/python2.7/site-packages/setuptools/version.py:1:
UserWarning: Module cffi was already imported from
/usr/lib64/python2.7/site-packages/cffi/__init__.pyc, but
/tmp/easy_install-HY89WT/cffi-1.9.1 is being added to sys.path
      import pkg_resources

    Installed /tmp/pip-build-OX9KGK/pygit2/.eggs/cffi-1.9.1-py2.7-linux-x86_64.egg
    /usr/lib/python2.7/site-packages/setuptools/dist.py:378:
UserWarning: Module cffi was already imported from
/usr/lib64/python2.7/site-packages/cffi/__init__.pyc, but
/tmp/pip-build-OX9KGK/pygit2/.eggs/cffi-1.9.1-py2.7-linux-x86_64.egg
is being added to sys.path
      pkg_resources.working_set.add(dist, replace=True)
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-build-OX9KGK/pygit2/setup.py", line 210, in <module>
        **extra_args)
      File "/usr/lib64/python2.7/distutils/core.py", line 112, in setup
        _setup_distribution = dist = klass(attrs)
      File "/usr/lib/python2.7/site-packages/setuptools/dist.py", line
321, in __init__
        _Distribution.__init__(self, attrs)
      File "/usr/lib64/python2.7/distutils/dist.py", line 287, in __init__
        self.finalize_options()
      File "/usr/lib/python2.7/site-packages/setuptools/dist.py", line
390, in finalize_options
        ep.load()(self, ep.name, value)
      File "/usr/lib64/python2.7/site-packages/cffi/setuptools_ext.py",
line 188, in cffi_modules
        add_cffi_module(dist, cffi_module)
      File "/usr/lib64/python2.7/site-packages/cffi/setuptools_ext.py",
line 49, in add_cffi_module
        execfile(build_file_name, mod_vars)
      File "/usr/lib64/python2.7/site-packages/cffi/setuptools_ext.py",
line 25, in execfile
        exec(code, glob, glob)
      File "pygit2/_run.py", line 67, in <module>
        ffi = FFI()
      File "/usr/lib64/python2.7/site-packages/cffi/api.py", line 54,
in __init__
        backend.__version__, backend.__file__))
    Exception: Version mismatch: this is the 'cffi' package version
1.10.0, located in '/usr/lib64/python2.7/site-packages/cffi/api.pyc'.
When we import the top-level '_cffi_backend' extension module, we get
version 1.9.1, located in
'/tmp/pip-build-OX9KGK/pygit2/.eggs/cffi-1.9.1-py2.7-linux-x86_64.egg/_cffi_backend.so'.
The two versions should be equal; check your installation.

    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in
/tmp/pip-build-OX9KGK/pygit2/

Thanks.
MR (long time s/w professional but python newb)