title: An error occurred while installing nokogiri (1.6.6.2), and Bundler cannot continue
body: <p>While executing sudo bundle install i am getting following error.
  Gem files will remain installed in
  /Users/madhakul/Documents/Inshort/puurna/vendor/cache/ruby/2.3.0/gems/nokogiri-1.6.6.2
  for inspection.
  Results logged to
  /Users/madhakul/Documents/Inshort/puurna/vendor/cache/ruby/2.3.0/extensions/universal-darwin-18/2.3.0/nokogiri-1.6.6.2/gem_make.out</p>
  
  <p>An error occurred while installing nokogiri (1.6.6.2), and Bundler
  cannot continue.
  Make sure that <code>gem install nokogiri -v '1.6.6.2' --source
  'https://rubygems.org/'</code> succeeds before bundling.</p>
  
  <p>In Gemfile:
    roo was resolved to 2.0.0, which depends on</p>
  
  <p>After going through few help materials, installed Developer tools for MacOS 10.14 Mojave but still not able to resolve the issue.</p>