Ruby 1.9 and ActiveRecord

I'm trying to use ActiveRecord outside of Rails and with Ruby 1.9. I kept getting an error

/opt/local/lib/ruby1.9/gems/1.9.1/gems/activerecord-2.2.2/lib/active_record/base.rb:394:in `': undefined method `cattr_accessor' for ActiveRecord::Base:Class (NoMethodError)
	from /opt/local/lib/ruby1.9/gems/1.9.1/gems/activerecord-2.2.2/lib/active_record/base.rb:391:in `'
	from /opt/local/lib/ruby1.9/gems/1.9.1/gems/activerecord-2.2.2/lib/active_record/base.rb:4:in `'
	from /opt/local/lib/ruby1.9/gems/1.9.1/gems/activerecord-2.2.2/lib/active_record.rb:34:in `require'
	from /opt/local/lib/ruby1.9/gems/1.9.1/gems/activerecord-2.2.2/lib/active_record.rb:34:in `'
	from /opt/local/lib/ruby1.9/gems/1.9.1/gems/activerecord-2.2.2/lib/activerecord.rb:1:in `require'
	from /opt/local/lib/ruby1.9/gems/1.9.1/gems/activerecord-2.2.2/lib/activerecord.rb:1:in `'
	from SimpleTest.rb:2:in `require'
	from SimpleTest.rb:2:in `'

so and undefined method cattr_accessor in ActiveRecord::Base.

Trying the same code in 1.8 worked fine. After much searching I discovered that ActiveSupport had to be installed. This looked like it was installed when I installed ActiveRecord, but it possibly wasn't a complete install.

so after a

sudo gem install ActiveSupprt

I'm good to go