DRAFT... From http://blog.fiveruns.com/2008/3/3/compiling-ruby-rubygems-and-rails-on-ubuntu
Install pre-requisites
```ruby
apt-get -y install build-essential libssl-dev libreadline5-dev zlib1g-dev
```
Download and install
```ruby
cd /usr/local/src
wget http://ftp.ruby-lang.org/pub/ruby/1.8/ruby-1.8.6.tar.gz
tar zxvf ruby-1.8.6.tar.gz
cd ruby-1.8.6.tar.gz
./configure --prefix=/usr/local --with-openssl-dir=/usr --with-readline-dir=/usr --with-zlib-dir=/usr
make
make install
ruby -ropenssl -rzlib -rreadline -e "puts :success"
```