Error while installing caldecott <p>I am getting this error while running this command on windows <code>prompt&gt; gem insatll caldecott</code>. I have downloaded the development kit but the error is still the same.</p> <p>Please update your PATH to include build tools or download the DevKit from 'http://rubyinstaller.org/downloads' and follow the instructions at 'http://github.com/oneclick/rubyinstaller/wiki/Development-Kit'</p>