Rails - Feb 2010 - Rails 3: bundle install vendor - ffi 0.5.4 gem crashes : ERROR: Failed to build gem native extension

Installing ffi (0.5.4) from rubygems repository at http://gemcutter.org
with native extensions /usr/local/Cellar/ruby/1.9.1-p378/lib/ruby/
site_ruby/1.9.1/rubygems/installer.rb:504:in `rescue in block in
build_extensions'': ERROR: Failed to build gem native extension.
(Gem::Installer::ExtensionBuildError)

rake RUBYARCHDIR=/Users/kristianconsult/my_rails/rails3_apps/demo_app/
vendor/gems/ffi-0.5.4/lib RUBYLIBDIR=/Users/kristianconsult/my_rails/
rails3_apps/demo_app/vendor/gems/ffi-0.5.4/lib
/usr/local/Cellar/ruby/1.9.1-p378/lib/ruby/site_ruby/1.9.1/rubygems.rb:
827:in `report_activate_error'': Could not find RubyGem rake (>= 0)
(Gem::LoadError)
	from /usr/local/Cellar/ruby/1.9.1-p378/lib/ruby/site_ruby/1.9.1/
rubygems.rb:261:in `activate''
	from /usr/local/Cellar/ruby/1.9.1-p378/lib/ruby/site_ruby/1.9.1/
rubygems.rb:68:in `gem''
	from <internal:gem_prelude>:273:in
`push_gem_version_on_load_path''
	from <internal:gem_prelude>:14:in `gem''
	from /usr/local/bin/rake:18:in `<main>''

How can I resolve this?

Gemfile
---
git "git://github.com/rails/arel.git"
git "git://github.com/rails/arel.git"
git "git://github.com/rails/rack.git"
git "git://github.com/rspec/rspec.git"
git "git://github.com/negonicrac/rspec-rails.git"
git "git://github.com/kristianmandrup/cucumber-rails.git"

gem "rails", "3.0.0.beta1", :git =>
"git://github.com/rails/rails.git"

source :gemcutter
source "http://gems.github.com"

gem "sqlite3-ruby"
gem "rspec-rails", "2.0.0.a4"
gem "rspec", "2.0.0.a4"
gem ''database_cleaner'', ''>=0.4.3''
gem ''capybara'', ''>=0.3.0''
gem ''cucumber''
gem ''cucumber-rails'', ''0.2.5''
gem "webrat"
--

Thanks :)

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