prashanth kumar wrote in post #1031219:
> unable to install compass
> OS Win7
> Ruby 1.9.2
>
> gem sources : http://rubygems.org/
>
> gem update --system
> gem install compass
>   throwing
> ERROR:  While executing gem ... (Zlib::GzipFile::Error)
>     not in gzip format

Since your report is lacking some context (I recommend reading this link 
[1])

I can guess the following.

#1, you're behind a firewall

#2, this firewall is either blocking S3 downloads (coming from 
rubygems.org)

#3, these downloads are then unrecognizable by RubyGems

I recommend take a look to your proxy settings and use either 
--http-proxy switch of `gem install` command or HTTP_PROXY environment 
variable.

gem install compass --http-proxy http://user:pass@proxy:port/

or:

SET HTTP_PROXY=http://user:pass@proxy:port/

gem install compass

More info:

gem help install

[1] http://yourbugreportneedsmore.info/
--
Luis Lavena

-- 
Posted via http://www.ruby-forum.com/.