gistfile1.txt

$ ruby -v
ruby 1.8.7 (2011-12-28 MBARI 8/0x6770 on patchlevel 357) [i686-darwin11.3.0], MBARI 0x6770, Ruby Enterprise Edition 2012.01

$ rails -h
/Users/ivaughan/.rbenv/versions/ree-1.8.7-2012.01/lib/ruby/gems/1.8/gems/activesupport-2.3.8/lib/active_support/dependencies.rb:55: uninitialized constant ActiveSupport::Dependencies::Mutex (NameError)
  from /Users/ivaughan/.rbenv/versions/ree-1.8.7-2012.01/lib/ruby/gems/1.8/gems/activesupport-2.3.8/lib/active_support.rb:57:in `require'
  from /Users/ivaughan/.rbenv/versions/ree-1.8.7-2012.01/lib/ruby/gems/1.8/gems/activesupport-2.3.8/lib/active_support.rb:57
  from /Users/ivaughan/.rbenv/versions/ree-1.8.7-2012.01/lib/ruby/gems/1.8/gems/rails-2.3.8/lib/rails_generator.rb:31:in `require'
  from /Users/ivaughan/.rbenv/versions/ree-1.8.7-2012.01/lib/ruby/gems/1.8/gems/rails-2.3.8/lib/rails_generator.rb:31
  from /Users/ivaughan/.rbenv/versions/ree-1.8.7-2012.01/lib/ruby/gems/1.8/gems/rails-2.3.8/bin/rails:15:in `require'
  from /Users/ivaughan/.rbenv/versions/ree-1.8.7-2012.01/lib/ruby/gems/1.8/gems/rails-2.3.8/bin/rails:15
  from /Users/ivaughan/.rbenv/versions/ree-1.8.7-2012.01/lib/ruby/gems/1.8/bin/rails:19:in `load'
  from /Users/ivaughan/.rbenv/versions/ree-1.8.7-2012.01/lib/ruby/gems/1.8/bin/rails:19

$ gem -v
1.6.2

$ rails -v
Rails 2.3.8

$ gem update --system
Updating rubygems-update
Fetching: rubygems-update-1.8.24.gem (100%)
Successfully installed rubygems-update-1.8.24
Installing RubyGems 1.8.24
RubyGems 1.8.24 installed

== 1.8.24 / 2012-04-27

$ gem -v
1.8.24

$ rails -h
/Users/ivaughan/.rbenv/versions/ree-1.8.7-2012.01/lib/ruby/gems/1.8/gems/activesupport-2.3.8/lib/active_support/dependencies.rb:55: uninitialized constant ActiveSupport::Dependencies::Mutex (NameError)

$ gem update --system 1.4.2
Updating rubygems-update
Fetching: rubygems-update-1.4.2.gem (100%)
Successfully installed rubygems-update-1.4.2
Installing RubyGems 1.4.2
RubyGems 1.4.2 installed

=== 1.4.2 / 2011-01-06

$ rails -h
Usage: /Users/ivaughan/.rbenv/versions/ree-1.8.7-2012.01/lib/ruby/gems/1.8/bin/rails /path/to/your/app [options]

Options:
    -r, --ruby=path                  Path to the Ruby binary of your choice (otherwise scripts use env, dispatchers current path).

...