pip install flexget 时遇到的问题，求教各位专家！

[coldspring]

系统为debian 6
Installing collected packages: apscheduler, argparse, babelfish, BeautifulSoup, beautifulsoup4, distribute, FeedParser, flexget, futures, guessit, html5lib, jinja2, jsonschema, markupsafe, path.py, pbr, pip, plumbum, progressbar, pynzb, PyRSS2Gen, python-dateutil, python-tvrage, pytz, PyYAML, requests, rpyc, setuptools, six, SQLAlchemy, stevedore, tmdb3, tzlocal
Found existing installation: APScheduler 3.0.1
Uninstalling APScheduler:
Successfully uninstalled APScheduler
Running setup.py install for apscheduler
Found existing installation: argparse 1.3.0
Uninstalling argparse:
Successfully uninstalled argparse
Running setup.py install for argparse
warning: no previously-included files matching '.pyc' found anywhere in distribution
warning: no previously-included files matching '.pyo' found anywhere in distribution
warning: no previously-included files matching '.orig' found anywhere in distribution
warning: no previously-included files matching '.rej' found anywhere in distribution
no previously-included directories found matching 'doc/_build'
no previously-included directories found matching 'env24'
no previously-included directories found matching 'env25'
no previously-included directories found matching 'env26'
no previously-included directories found matching 'env27'
Found existing installation: babelfish 0.5.4
Uninstalling babelfish:
Successfully uninstalled babelfish
Running setup.py install for babelfish
Found existing installation: BeautifulSoup 3.2.1
Uninstalling BeautifulSoup:
Successfully uninstalled BeautifulSoup
Running setup.py install for BeautifulSoup
Found existing installation: beautifulsoup4 4.3.2
Uninstalling beautifulsoup4:
Successfully uninstalled beautifulsoup4
Running setup.py install for beautifulsoup4
Found existing installation: distribute 0.6.14
Uninstalling distribute:
Successfully uninstalled distribute
Running setup.py install for distribute
Found existing installation: feedparser 5.1.3
Uninstalling feedparser:
Successfully uninstalled feedparser
Running setup.py install for FeedParser
usage: -c [global_opts] cmd1 [cmd1_opts] [cmd2 [cmd2_opts] ...]
or: -c --help [cmd1 cmd2 ...]
or: -c --help-commands
or: -c cmd --help

error: option --single-version-externally-managed not recognized
Complete output from command /usr/bin/python -c "import setuptools; __file__='/root/build/FeedParser/setup.py'; execfile('/root/build/FeedParser/setup.py')" install --single-version-externally-managed --record /tmp/pip-QOO0Lq-record/install-record.txt:
usage: -c [global_opts] cmd1 [cmd1_opts] [cmd2 [cmd2_opts] ...]

or: -c --help [cmd1 cmd2 ...]

or: -c --help-commands

or: -c cmd --help

error: option --single-version-externally-managed not recognized

---

Rolling back uninstall of feedparser
Command /usr/bin/python -c "import setuptools; file='/root/build/FeedParser/setup.py'; execfile('/root/build/FeedParser/setup.py')" install --single-version-externally-managed --record /tmp/pip-QOO0Lq-record/install-record.txt failed with error code 1
Storing complete log in /root/.pip/pip.log
这个是什么原因的错误呢？怎么解决？