Possible Duplicate:
Rails 3.1 e Ruby 1.9.3p125: o ruby-debug19 ainda trava com “Símbolo não encontrado: _ruby_threadptr_data_type”

Estou tendo alguns problemas para que a depuração funcione na versão Ruby 1.9.3 preview

Instalei o 1.9.3 usando o rvm com o seguinte comando:

rvm install 1.9.3 --reconfigure --debug -C --enable-pthread

E instalou o ruby-debug19 com isso:

gem install ruby-debug19 -- --with-ruby-include=$rvm_path/src/ruby-1.9.3-preview1

A gem de depuração é boa, mas quando vou abrir um console com depuração ou tento qualquer coisa com um sinalizador de depuraçãorails c --debug ourspec spec --debug. Estou tendo o erro a seguir

/Users/mario/.rvm/gems/ruby-1.9.3-preview1@project/gems/activesupport-3.0.9/lib/active_support/dependencies.rb:239:in `require': dlopen(/Users/mario/.rvm/gems/ruby-1.9.3-preview1@project/gems/ruby-debug-base19-0.11.25/lib/ruby_debug.bundle, 9): Symbol not found: _ruby_current_thread (LoadError)
  Referenced from: /Users/mario/.rvm/gems/ruby-1.9.3-preview1@project/gems/ruby-debug-base19-0.11.25/lib/ruby_debug.bundle
  Expected in: flat namespace
 in /Users/mario/.rvm/gems/ruby-1.9.3-preview1@project/gems/ruby-debug-base19-0.11.25/lib/ruby_debug.bundle - /Users/mario/.rvm/gems/ruby-1.9.3-preview1@project/gems/ruby-debug-base19-0.11.25/lib/ruby_debug.bundle
    from /Users/mario/.rvm/gems/ruby-1.9.3-preview1@project/gems/activesupport-3.0.9/lib/active_support/dependencies.rb:239:in `block in require'
    from /Users/mario/.rvm/gems/ruby-1.9.3-preview1@project/gems/activesupport-3.0.9/lib/active_support/dependencies.rb:225:in `block in load_dependency'
    from /Users/mario/.rvm/gems/ruby-1.9.3-preview1@project/gems/activesupport-3.0.9/lib/active_support/dependencies.rb:596:in `new_constants_in'
    from /Users/mario/.rvm/gems/ruby-1.9.3-preview1@project/gems/activesupport-3.0.9/lib/active_support/dependencies.rb:225:in `load_dependency'
    from /Users/mario/.rvm/gems/ruby-1.9.3-preview1@project/gems/activesupport-3.0.9/lib/active_support/dependencies.rb:239:in `require'
    from /Users/mario/.rvm/gems/ruby-1.9.3-preview1@project/gems/ruby-debug-base19-0.11.25/lib/ruby-debug-base.rb:1:in `<top (required)>'
    from /Users/mario/.rvm/gems/ruby-1.9.3-preview1@project/gems/activesupport-3.0.9/lib/active_support/dependencies.rb:239:in `require'
    from /Users/mario/.rvm/gems/ruby-1.9.3-preview1@project/gems/activesupport-3.0.9/lib/active_support/dependencies.rb:239:in `block in require'
    from /Users/mario/.rvm/gems/ruby-1.9.3-preview1@project/gems/activesupport-3.0.9/lib/active_support/dependencies.rb:225:in `block in load_dependency'
    from /Users/mario/.rvm/gems/ruby-1.9.3-preview1@project/gems/activesupport-3.0.9/lib/active_support/dependencies.rb:596:in `new_constants_in'
    from /Users/mario/.rvm/gems/ruby-1.9.3-preview1@project/gems/activesupport-3.0.9/lib/active_support/dependencies.rb:225:in `load_dependency'
    from /Users/mario/.rvm/gems/ruby-1.9.3-preview1@project/gems/activesupport-3.0.9/lib/active_support/dependencies.rb:239:in `require'
    from /Users/mario/.rvm/gems/ruby-1.9.3-preview1@project/gems/ruby-debug19-0.11.6/cli/ruby-debug.rb:5:in `<top (required)>'
    from /Users/mario/.rvm/gems/ruby-1.9.3-preview1@global/gems/bundler-1.0.17/lib/bundler/runtime.rb:68:in `require'
    from /Users/mario/.rvm/gems/ruby-1.9.3-preview1@global/gems/bundler-1.0.17/lib/bundler/runtime.rb:68:in `block (2 levels) in require'
    from /Users/mario/.rvm/gems/ruby-1.9.3-preview1@global/gems/bundler-1.0.17/lib/bundler/runtime.rb:66:in `each'
    from /Users/mario/.rvm/gems/ruby-1.9.3-preview1@global/gems/bundler-1.0.17/lib/bundler/runtime.rb:66:in `block in require'
    from /Users/mario/.rvm/gems/ruby-1.9.3-preview1@global/gems/bundler-1.0.17/lib/bundler/runtime.rb:55:in `each'
    from /Users/mario/.rvm/gems/ruby-1.9.3-preview1@global/gems/bundler-1.0.17/lib/bundler/runtime.rb:55:in `require'
    from /Users/mario/.rvm/gems/ruby-1.9.3-preview1@global/gems/bundler-1.0.17/lib/bundler.rb:120:in `require'
    from /Users/mario/Work/project/config/application.rb:7:in `<top (required)>'
    from /Users/mario/.rvm/gems/ruby-1.9.3-preview1@project/gems/railties-3.0.9/lib/rails/commands.rb:21:in `require'
    from /Users/mario/.rvm/gems/ruby-1.9.3-preview1@project/gems/railties-3.0.9/lib/rails/commands.rb:21:in `<top (required)>'
    from script/rails:6:in `require'
    from script/rails:6:in `<main>'