An error occurred while installing nokogiri (1.5.6), and Bundler cannot continue. Make sure that `gem install nokogiri -v '1.5.6'` succeeds before bundling.

For Cent OS:

sudo yum install -y gcc ruby-devel libxml2 libxml2-devel libxslt libxslt-devel

For Ubuntu:

sudo apt-get install -y gcc ruby-devel libxml2 libxml2-devel libxslt libxslt-devel

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