title: Ruby/GEM install Middleman error: The 'fast_blank' native gem requires installed build tools
body: <p>I'm trying to install <a href="https://middlemanapp.com/" rel="nofollow noreferrer">https://middlemanapp.com/</a> using "gem", but getting the following error. I read the link in the error message, but I can't find any solution. </p>
  
  <p>C:\Users\user1>ruby -v
      ruby 2.3.3p222 (2016-11-21 revision 56859) [x64-mingw32]</p>
  
  <pre><code>C:\Users\user1&gt;gem -v
  2.5.2
  
  C:\Users\user1&gt;gem install middleman
  Fetching: bundler-1.13.6.gem (100%)
  Successfully installed bundler-1.13.6
  Fetching: rack-2.0.1.gem (100%)
  Successfully installed rack-2.0.1
  Fetching: tilt-2.0.5.gem (100%)
  Successfully installed tilt-2.0.5
  Fetching: erubis-2.7.0.gem (100%)
  Successfully installed erubis-2.7.0
  Fetching: fast_blank-1.0.0.gem (100%)
  ERROR:  Error installing middleman:
          The 'fast_blank' native gem requires installed build tools.
  
  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'
  </code></pre>