Rails - May 2011 - Change from 3.0.6 => Rails 3.0.7 "no such file to load -- action_mailer/railtie"

In my application.rb, I have this:

#require "rails/all"
require "action_controller/railtie"
require "action_mailer/railtie"
require "active_resource/railtie"
require "active_model/railtie"

(I didn''t want ActiveRecord) This worked fine up to 3.0.6, but now
fails
with:

/Users/jeffdeville/Documents/code/ruby/wg/config/application.rb:6:in 
`require'': no such file to load -- action_mailer/railtie (LoadError)
from /Users/jeffdeville/Documents/code/ruby/wg/config/application.rb:6:in 
`<top (required)>''
from 
/Users/jeffdeville/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.7/lib/rails/commands.rb:28:in
`require''
from 
/Users/jeffdeville/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.7/lib/rails/commands.rb:28:in
`block in <top (required)>''
from 
/Users/jeffdeville/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.7/lib/rails/commands.rb:27:in
`tap''
from 
/Users/jeffdeville/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.7/lib/rails/commands.rb:27:in
`<top (required)>''
from script/rails:6:in `require''
from script/rails:6:in `<main>''

Suggestions please?

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