Gem for ruby in Cygwin

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don't try to install rubygems for cygwin using the gem that comes with the ruby one-click installer for windows. instead, get the tarball, or zip file, and install it using the included installer script.

since rubygems is pure ruby you don't have to worry about having a compiler installed. it should just work with the default cygwin install plus ruby and its dependencies. to install it, do the following steps:

download the rubygems tarball from ruby forge
unpack the tarball
in a bash terminal, navigate to the unpacked directory
run the following command:
ruby setup.rb install
update rubygems by running the following:
gem update --system
note: you may need to run the updated command twice if you have any previously installed gems.