user rvm to install your ruby packages.

$ vi ~/.profile

add following line to your .profile. all your installations with rvm will take effect.

[[ -s "$HOME/.rvm/scripts/rvm" ]] && . "$HOME/.rvm/scripts/rvm" # This loads RVM into a shell session.


$ source .profile

$ ruby --version
ruby 1.8.7 (2008-08-11 patchlevel 72) [powerpc-darwin9.8.0]

$ rails --version
Rails 3.0.6

$ rake --version
rake, version 0.8.7

$ gem --version
1.7.2