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Login as root
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Install needed packages
apt-get -y install build-essential zlib1g-dev libssl-dev libreadline6-dev libyaml-dev
cd /tmp
- Download appropriate ruby version https://www.ruby-lang.org/en/downloads/
wget http://cache.ruby-lang.org/pub/ruby/2.1/ruby-2.1.2.tar.gz
- Unpack downloaded package
tar -xvzf ruby-2.1.2.tar.gz
cd ruby-2.1.2/
- Compile from source
./configure --prefix=/usr/local
make
make install