Installing ruby on Rails piecemeal

I had originally downloaded RoR using Got
everything going. It was great, but I wanted Ruby 1.9.2 instead of
what comes with the installer, Ruby 1.8.7. So I uninstalled it and
downloaded Ruby 1.9.2 and ran:
$ gem update --system
$ gem sources -
$ gem install rails

so far so good, sorta.

Installing sqlite3? Can't figure it out. Any help is appreciated.


Found it in a previous post Gives a link to installing RoR and