Building Ruby and Rails on MAC 10.4

You can check the following link for a step-by-step guide to build your rails environment on the MAC OS 10.4.

you can just change the versions you need to install. (I get the latest ones)
After finishing don't use the $ruby -version
In this case, you will get an error. the error is due that ruby tries to evaluate ruby -v then "ersion".

to check ur version just run $ruby -v