##Intro People want to start working on apps in Rails 3.0. Rails 3 is supporting ruby 1.8.7 and ruby 1.9.2. These instructions will assist you with getting Rails 3 and ruby 1.9.2 installed. I’m tossing this up here to have something to point people to when they have questions.

I’m making a few assumptions:

  1. You’re on OS X Snow Leopard (x86_64) (Most of these instructions will work on any *nix box. Leave a comment if you have trouble.)
  2. You have macports install (or readline installed somewhere else on your box)

##Install Ruby Version Manager

Note: Just run this command and follow the instructions.
$ bash < <( curl )

##Install Ruby 1.9.2

Your readline directory may be in a different spot.
$ rvm install 1.9.2 -C --with-readline-dir=/opt/local,--build=x86_64-apple-darwin10
Installing Ruby from source to: /Users/mturner/.rvm/rubies/ruby-1.9.2-p0

Running autoconf

Configuring ruby-1.9.2-p0, this may take a while depending on your cpu(s)...

Compiling ruby-1.9.2-p0, this may take a while, depending on your cpu(s)...

Installing ruby-1.9.2-p0

Installation of ruby-1.9.2-p0 is complete.

Updating rubygems for ruby-1.9.2-p0

Installing gems for ruby-1.9.2-p0.

Installing rake

Installation of gems for ruby-1.9.2-p0 is complete.

$ rvm 1.9.2

$ ruby -v
ruby 1.9.2p0

##Create a Rails 3.0 Gem set and switch to it This processes allows us to isolate the Rails 3.0 environment gems.

$ rvm use --create [email protected]

##Install the Rails 3.0 Gems and dependencies

$ gem install sqlite3-ruby
$ env ARCHFLAGS="-arch x86_64" gem install mysql -- --with-mysql-config=/usr/local/mysql/bin/mysql_config
$ gem install rails

##Done Hopefully everything worked:

$ ruby -v
  ruby 1.9.2p0 (2010-08-18 revision 29036) [x86_64-darwin10.4.0]
$ rails --version
  Rails 3.0.0
$ gem list
  *** LOCAL GEMS ***

  abstract (1.0.0)
  actionmailer (3.0.0)
  actionpack (3.0.0)
  activemodel (3.0.0)
  activerecord (3.0.0)
  activeresource (3.0.0)
  activesupport (3.0.0)
  arel (1.0.1)
  builder (2.1.2)
  bundler (1.0.0.rc.5)
  erubis (2.6.6)
  i18n (0.4.1)
  mail (2.2.5)
  memcache-client (1.8.5)
  mime-types (1.16)
  mysql (2.8.1)
  rack (1.2.1)
  rack-mount (0.6.12)
  rack-test (0.5.4)
  rails (3.0.0)
  railties (3.0.0)
  rake (0.8.7)
  sqlite3-ruby (1.3.1)
  text-format (1.0.0)
  text-hyphen (1.0.0)
  thor (0.14.0)
  tzinfo (0.3.22)

##Switching back to your system Ruby rvm system

##Back to your Rails3.0 environment rvm [email protected]

##Use your RVM environment as your Default rvm [email protected] --default

Read more about RVM over at

###Update 04/16/2010 Updated to reflect the recent changes in RVM.

###Update 08/18/2010 Updated to use the production release of 1.9.2

###Update 08/30/2010 Updated to reflect the Rails 3.0 release.