If you want to use this package as your default system ruby, as root
create symbolic links like so (overwriting any previous default):
 ln -sf /usr/local/bin/ruby22 /usr/local/bin/ruby
 ln -sf /usr/local/bin/erb22 /usr/local/bin/erb
 ln -sf /usr/local/bin/irb22 /usr/local/bin/irb
 ln -sf /usr/local/bin/rdoc22 /usr/local/bin/rdoc
 ln -sf /usr/local/bin/ri22 /usr/local/bin/ri
 ln -sf /usr/local/bin/rake22 /usr/local/bin/rake
 ln -sf /usr/local/bin/gem22 /usr/local/bin/gem
