I was trying to setup the Slate API Documentation Server on an EC2 instance running Amazon Linux. When I fetch the git repository and attempted to install the dependencies using bundle install, it would fail with the following error.

$ bundle install
/usr/share/ruby/vendor_ruby/2.0/rubygems/core_ext/kernel_require.rb:55:in `require': cannot load such file -- io/console (LoadError)
	from /usr/share/ruby/vendor_ruby/2.0/rubygems/core_ext/kernel_require.rb:55:in `require'
	from /usr/local/share/ruby/gems/2.0/gems/bundler-1.12.5/lib/bundler/vendor/thor/lib/thor/shell/basic.rb:2:in `<top (required)>'
	from /usr/share/ruby/vendor_ruby/2.0/rubygems/core_ext/kernel_require.rb:55:in `require'
	from /usr/share/ruby/vendor_ruby/2.0/rubygems/core_ext/kernel_require.rb:55:in `require'
	from /usr/local/share/ruby/gems/2.0/gems/bundler-1.12.5/lib/bundler/vendor/thor/lib/thor/shell/color.rb:1:in `<top (required)>'
	from /usr/local/share/ruby/gems/2.0/gems/bundler-1.12.5/lib/bundler/vendor/thor/lib/thor/shell.rb:17:in `shell'
	from /usr/local/share/ruby/gems/2.0/gems/bundler-1.12.5/lib/bundler/ui/shell.rb:15:in `initialize'
	from /usr/local/share/ruby/gems/2.0/gems/bundler-1.12.5/lib/bundler/cli.rb:13:in `new'
	from /usr/local/share/ruby/gems/2.0/gems/bundler-1.12.5/lib/bundler/cli.rb:13:in `rescue in start'
	from /usr/local/share/ruby/gems/2.0/gems/bundler-1.12.5/lib/bundler/cli.rb:11:in `start'
	from /usr/local/share/ruby/gems/2.0/gems/bundler-1.12.5/exe/bundle:27:in `block in <top (required)>'
	from /usr/local/share/ruby/gems/2.0/gems/bundler-1.12.5/lib/bundler/friendly_errors.rb:98:in `with_friendly_errors'
	from /usr/local/share/ruby/gems/2.0/gems/bundler-1.12.5/exe/bundle:19:in `<top (required)>'
	from /usr/local/bin/bundle:23:in `load'
	from /usr/local/bin/bundle:23:in `<main>'

I was able to work around this by removing the system installed version of ruby and replace it with an rvm, and newer, version.

sudo yum update
cd ~
gpg2 --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3
wget https://raw.github.com/wayneeseguin/rvm/master/binscripts/rvm-installer
bash -s stable < rvm-installer
source /home/ec2-user/.rvm/scripts/rvm
rvm requirements
sudo yum erase ruby
rvm install ruby
rvm use ruby --default
rvm rubygems current

Once you have replaced the version of ruby on the system, you will need to install bundler and then the dependencies.

gem install bundler
bundle install

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