【求助】ERROR: No matching distribution found for python-gssapi==0.6.4怎么解决

Collecting python-gssapi==0.6.4
  Using cached https://pypi.tuna.tsinghua.edu.cn/packages/a4/9e/648b4e85235097edcee561c986f7075cb1606be24c514cfcdd2930e35c5e/python-gssapi-0.6.4.tar.gz (28 kB)
  Preparing metadata (setup.py) ... error
  ERROR: Command errored out with exit status 1:
   command: /opt/py3/bin/python3 -c 'import io, os, sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-ypph375x/python-gssapi_1b67c6ea6357425eba44edad4eeccb0c/setup.py'"'"'; __file__='"'"'/tmp/pip-install-ypph375x/python-gssapi_1b67c6ea6357425eba44edad4eeccb0c/setup.py'"'"';f = getattr(tokenize, '"'"'open'"'"', open)(__file__) if os.path.exists(__file__) else io.StringIO('"'"'from setuptools import setup; setup()'"'"');code = f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /tmp/pip-pip-egg-info-pb7unt40
       cwd: /tmp/pip-install-ypph375x/python-gssapi_1b67c6ea6357425eba44edad4eeccb0c/
  Complete output (23 lines):
  Couldn't find index page for 'cffi' (maybe misspelled?)
  No local packages or working download links found for cffi>=0.8
  Traceback (most recent call last):
    File "", line 1, in
    File "/tmp/pip-install-ypph375x/python-gssapi_1b67c6ea6357425eba44edad4eeccb0c/setup.py", line 74, in
      url="https://github.com/sigmaris/python-gssapi",
    File "/usr/local/lib/python3.6/distutils/core.py", line 108, in setup
      _setup_distribution = dist = klass(attrs)
    File "/opt/py3/lib/python3.6/site-packages/setuptools/dist.py", line 315, in __init__
      self.fetch_build_eggs(attrs['setup_requires'])
    File "/opt/py3/lib/python3.6/site-packages/setuptools/dist.py", line 361, in fetch_build_eggs
      replace_conflicting=True,
    File "/opt/py3/lib/python3.6/site-packages/pkg_resources/__init__.py", line 850, in resolve
      dist = best[req.key] = env.best_match(req, ws, installer)
    File "/opt/py3/lib/python3.6/site-packages/pkg_resources/__init__.py", line 1122, in best_match
      return self.obtain(req, installer)
    File "/opt/py3/lib/python3.6/site-packages/pkg_resources/__init__.py", line 1134, in obtain
      return installer(requirement)
    File "/opt/py3/lib/python3.6/site-packages/setuptools/dist.py", line 429, in fetch_build_egg
      return cmd.easy_install(req)
    File "/opt/py3/lib/python3.6/site-packages/setuptools/command/easy_install.py", line 659, in easy_install
      raise DistutilsError(msg)
  distutils.errors.DistutilsError: Could not find suitable distribution for Requirement.parse('cffi>=0.8')
  ----------------------------------------
WARNING: Discarding https://pypi.tuna.tsinghua.edu.cn/packages/a4/9e/648b4e85235097edcee561c986f7075cb1606be24c514cfcdd2930e35c5e/python-gssapi-0.6.4.tar.gz#sha256=d984a697957e81ae096c1e2aa0376413a58c1f9ac2020cfe41c235dee0ca1414 (from https://pypi.tuna.tsinghua.edu.cn/simple/python-gssapi/). Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.
ERROR: Could not find a version that satisfies the requirement python-gssapi==0.6.4 (from versions: 0.2.5, 0.3.0, 0.4.0, 0.4.1, 0.5.0, 0.5.1, 0.6.0, 0.6.1, 0.6.2, 0.6.3, 0.6.4)
ERROR: No matching distribution found for python-gssapi==0.6.4