I assume you mean "--pre". I sat down and did everything from start and installed Ruby 1.9.1 and the DevKit from
http://rubyinstaller.org/downloads/ following the instructions at
https://github.com/oneclick/rubyinstaller/wiki/Development-KitI then did a "gem install eventmachine --pre" and the gem "eventmachine-1.0.0.beta.2-x86-mingw32" was installed.
I ran util\setup.rb
BUT when I try to start the server.rb I get a dialog from ruby saying it can't find the procedure start adress ruby_snprintf in the DLL file msvcrt-ruby191.dll
Closing that dialog I get:
----------
Unable to load the EventMachine C extension; To use the pure-ruby reactor, requi
re 'em/pure_ruby'
C:/Ruby191/lib/ruby/gems/1.9.1/gems/eventmachine-1.0.0.beta.2-x86-mingw32/lib/ru
byeventmachine.rb:2:in `require': 127: Det gÕr inte att hitta den angivna proced
uren. - C:/Ruby191/lib/ruby/gems/1.9.1/gems/eventmachine-1.0.0.beta.2-x86-ming
w32/lib/1.9/rubyeventmachine.so (LoadError)
from C:/Ruby191/lib/ruby/gems/1.9.1/gems/eventmachine-1.0.0.beta.2-x86-m
ingw32/lib/rubyeventmachine.rb:2:in `<top (required)>'
from C:/Ruby191/lib/ruby/gems/1.9.1/gems/eventmachine-1.0.0.beta.2-x86-m
ingw32/lib/eventmachine.rb:8:in `require'
from C:/Ruby191/lib/ruby/gems/1.9.1/gems/eventmachine-1.0.0.beta.2-x86-m
ingw32/lib/eventmachine.rb:8:in `<top (required)>'
from server.rb:26:in `require'
from server.rb:26:in `<main>'
--------
Next I will do everything from start again, but with 1.9.2
Hope this helps in tracking down what's wrong.