Install rbenv in CentOS 7

gistfile1.txt

# install build dependencies
sudo yum install -y git-core zlib zlib-devel gcc-c++ patch readline readline-devel libyaml-devel libffi-devel openssl-devel make bzip2 autoconf automake libtool bison curl sqlite-devel

# clone and install rbenv environment
cd ~
git clone git://github.com/sstephenson/rbenv.git .rbenv
git clone git://github.com/sstephenson/ruby-build.git ~/.rbenv/plugins/ruby-build
echo 'export PATH="$HOME/.rbenv/bin:$HOME/.rbenv/plugins/ruby-build/bin:$PATH"' >> ~/.bash_profile
echo 'eval "$(rbenv init -)"' >> ~/.bash_profile

# re-init bash
source ~/.bash_profile

# install latest ruby
rbenv install -v 2.2.2

# sets the default ruby version that the shell will use
rbenv global 2.2.2

# to disable generating of documents as that would take so much time
echo "gem: --no-document" > ~/.gemrc

# install bundler
gem install bundler

# must be executed everytime a gem has been installed in order for the ruby executable to run
rbenv rehash

FYI, for CentOS 9, powertools are called crb(CodeReady Linux Builder), so you need to run below command to enable powertools to install libyaml-devel

dnf config-manager --set-enabled crb