Bash script to install Ruby with RVM and selected dependencies on my system

ruby_install.sh

#!/bin/bash

#
#  ruby_install.sh
#  A simple Bash script for building up my Ruby development environment on a clean system.
#  The configuration used is the one that I like.
#    - Base system Ruby = version 1.9.2
#    - Ruby installed from source
#    - Installation of RVM + Rubies
#    - Configuration of gemset for local instance of Passenger
#


#
#  Script variables
#
WORKING_DIR=/tmp
RUBY_MAJOR=1.9
RUBY_MINOR=2
RUBY_PATCH=0

RUBY_VERSION=$RUBY_MAJOR.$RUBY_MINOR-p$RUBY_PATCH
RUBY_SOURCE=ruby-$RUBY_VERSION
RUBY_URL=ftp://ftp.ruby-lang.org/pub/ruby/$RUBY_MAJOR/$RUBY_SOURCE.tar.gz

PREFIX=/usr/local

RVM_RUBIES=( 1.8.7 1.9.1 1.9.2 ree rbx jruby )
DEFAULT_RUBY=1.9.2


#
#  Install base Ruby
#
cd $WORKING_DIR
wget $RUBY_URL
sudo rm -rf $RUBY_SOURCE
tar xzf $RUBY_SOURCE.tar.gz
cd $RUBY_SOURCE
autoconf
./configure --prefix=$PREFIX
make
sudo make install


#
#  Install RVM with SSL support
#
bash < <( curl http://rvm.beginrescueend.com/releases/rvm-install-head )
if grep -q ".rvm/scripts/rvm" "~/.bash_profile" ; then
    echo '[[ -s "$HOME/.rvm/scripts/rvm" ]] && . "$HOME/.rvm/scripts/rvm"' >> ~/.bash_profile
    echo '[[ -r $rvm_path/scripts/completion ]] && . $rvm_path/scripts/completion' >> .bash_profile
fi
source ~/.rvm/scripts/rvm
rvm package install openssl
rvm package install zlib
rvm package install readlib


#
#  Install Rubies for RVM
#
for ruby in ${RVM_RUBIES[@]}; do
  if [[ $ruby =~ ^rbx ]]; then
    rvm install $ruby
  else
    rvm install $ruby -C --with-openssl-dir=$HOME/.rvm/usr --with-zlib-dir=$HOME/.rvm/usr --with-readline-dir=$HOME/.rvm/usr
  fi
done
rvm --default $DEFAULT_RUBY


#
#  Set up support for running Passenger under REE.
#  Rack will live within the global gemset
#
rvm ree@global
gem install rack
rvm gemset create passenger
rvm ree@passenger
gem install passenger --pre        # version 3.0 is still in beta...
passenger-install-apache2-module --auto

echo
echo "Configuration of Apache server left as an exercise for the user..."