Open Stack

hi , all:

    i get horizon(essex-4) software package from
https://launchpad.net/horizon/essex/essex-4/+download/horizon-2012.1%7Ee4.tar.gz,
but i tar xf horizon compress package after, when i exec python setup.py
install emerge error , as follows:

Traceback (most recent call last):
  File "setup.py", line 35, in <module>
    long_description=read('README.rst'),
  File "setup.py", line 27, in read
    return open(os.path.join(os.path.dirname(__file__), fname)).read()
IOError: [Errno 2] No such file or directory: 'README.rst'
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