Ruby on Rails Beta 3 Install on Snow Leopard - file not found

Question

I tried to install the new beta on my system with the command:

sudo gem install rails --pre

but no matter what I tried, I still get this da

Answer 1

I found the same error message, while after some google I've successfully installed it by manually 'sudo mkdir lib' in the .../gems/rails-3.0.0.beta3. Though it hasn't raised further problem, I hope someone could tell what should be in the missing lib directory.