Cucumber and custom RSpec matchers

I'm trying to write a custom RSpec matcher for cucumber. I require cucumber/rails/rspec in env.rb, but I still get "uninitialized constant Spec::Matchers" error. I'm using la开发者_如何转开发test versions of Rspec, Cucumber and CucumberRails. What am I missing?

P.S. Same matcher works fine with pure RSpec...

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Are you using RSpec 2? The correct constant is now RSpec::Matchers for that. Defined in rspec/matchers.

If you're not, then perhaps you haven't required spec/matchers which defines the Spec::Matchers constant for RSpec < 2.