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I had ruby - I was missing the ruby-dev header files.

My original complaint though is that people are using "gem install" as the sole documentation for installing a general purpose command-line tool. I'd rather not even know it's written in Ruby (I just want to install it and use it) - instead, I need deep Ruby knowledge just to get the thing running.

I hate that it's using gem for install, too.

If knowing how to type "yum install ruby-devel" qualifies as "deep Ruby knowledge", I must be some kind of god.

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