openshift - ERROR: Could not find a valid gem 'rhc' (>= 0) in any repository -

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i trying install openshift client tools 

c:\> gem install rhc

but giving error 

error:  not find valid gem 'rhc' (>= 0) in repository

how avoid , install rhc. 

gem sources --remove https://rubygems.org/ gem sources --add http://rubygems.org/

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