title: Ruby: uninitialized constant Config (NameError)
body: <p>i've tried to install missing gem</p>
  
  <pre><code>$&gt; bundle install
  </code></pre>
  
  <p>and got error because of installing below gem</p>
  
  <pre><code>sudo gem install bluecloth -v '2.1.0'
  </code></pre>
  
  <blockquote>
    <p>--ruby=/Users/raksa/.rvm/rubies/ruby-2.3.0/bin/
    $(RUBY_BASE_NAME) extconf.rb:7:in `main': uninitialized constant Config (NameError)
    Did you mean?  RbConfig
                   CONFIG</p>
    
    <p>extconf failed, exit code 1</p>
  </blockquote>
  
  <p>is anyone know how to fix this?</p>