RVM + gemset with a ruby-1.9.2... crappy with ubuntu...

gistfile1.eclass

# setup rvm gemset
sudo rvm install ruby-1.9.2-p136
sudo rvm use ruby-1.9.2-p136@my_gemset --create

# setup apt repo and download needed lib in order to compile ruby1.9.2
sudo add-apt-repository ppa:ubuntu-on-rails/ppa
sudo apt-get update
sudo apt-get install libopenssl-ruby1.9.2 libxslt-dev libxml2-dev sqlite3 libsqlite3-dev

# extract package with rvm in the gemset
rvm package install zlib
rvm package install readline
rvm package install openssl

# cleanup old ruby
rvm remove ruby-1.9.2-p136

# compile this mess
rvm install ruby-1.9.2-p136 --with-zlib-dir=$rvm_path/usr/ --with-readline-dir=$rvm_path/usr --with-openssl-dir=$rvm_path/usr/