redcloth with rails3 and ruby 1.9.2

is redcloth working with rails3 and 1.9.2? I don't see it here -

redcloth 4.2.3 throws this exception when trying to use the method textilize: uninitialized constant ActionView::Helpers::TextHelper::RedCloth

I might need to use the 1.9.2. can you guide me how to use the 1.9.2 version? (I assume i'll have to clone the repo but not sure what to do next).