Install rbenv
$ git clone https://github.com/rbenv/rbenv.git ~/.rbenv
$ echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> ~/.bashrc
$ echo 'eval "$(rbenv init -)"' >> ~/.bashrc
$ git clone https://github.com/rbenv/ruby-build.git ~/.rbenv/plugins/ruby-build
Install ruby
$ rbenv install -l
$ rbenv global 2.4.1
