About installing OSQA through proxy

Hi,

I try to install OSQA through proxy on Ubuntu. So, I face the error in the following step,

sudo easy_install South django django-debug-toolbar markdown \\\\
    html5lib python-openid

The error is,

Searching for South
Reading http://pypi.python.org/simple/South/
Download error: [Errno -2] Name or service not known -- Some packages may not be found!
Reading http://pypi.python.org/simple/South/
Download error: [Errno -2] Name or service not known -- Some packages may not be found!
Couldn't find index page for 'South' (maybe misspelled?)
Scanning index of all packages (this may take a while)
Reading http://pypi.python.org/simple/
Download error: [Errno -2] Name or service not known -- Some packages may not be found!
No local packages or download links found for South
error: Could not find suitable distribution for Requirement.parse('South')

But, I set the HTTP_PROXY environment value.

export HTTP_PROXY=http://proxy.xxx.com:8080/

Do I have mistake?

Thanks, Takeshi Hosokawa