Bootstrap ruby 1.9.2 with chef on CentOS 5, needs updating to CentOS 6 and ruby 1.9.3

centos5-ruby192-chef.sh

#!/bin/bash
export GIT_SSL_NO_VERIFY=true

# rpmforge
rpm -Uhv http://apt.sw.be/redhat/el5/en/x86_64/rpmforge/RPMS//rpmforge-release-0.3.6-1.el5.rf.x86_64.rpm
yum update -y

# dev requirements
yum groupinstall -y "Development Tools"
yum install -y \
  bash-completion \
  openssl-devel \
  readline-devel \
  curl-devel \
  zlib-devel \
  git \
  curl

mkdir -p /opt/essential 
cd /opt/essential 
git clone https://github.com/sstephenson/ruby-build.git

cd /opt/essential/ruby-build 
./install.sh 
ruby-build 1.9.2-p290 /usr/local
gem install chef --no-ri --no-rdoc