RubyInstaller 1.9 rdiscount installation

environment

C:\Users\Jon>gem env
RubyGems Environment:
  - RUBYGEMS VERSION: 1.8.10
  - RUBY VERSION: 1.9.3 (2011-09-27 patchlevel -1) [i386-mingw32]
  - INSTALLATION DIRECTORY: C:/ruby193/lib/ruby/gems/1.9.1
  - RUBY EXECUTABLE: C:/ruby193/bin/ruby.exe
  - EXECUTABLE DIRECTORY: C:/ruby193/bin
  - RUBYGEMS PLATFORMS:
    - ruby
    - x86-mingw32
  - GEM PATHS:
     - C:/ruby193/lib/ruby/gems/1.9.1
     - C:/Users/Jon/.gem/ruby/1.9.1
  - GEM CONFIGURATION:
     - :update_sources => true
     - :verbose => true
     - :benchmark => false
     - :backtrace => false
     - :bulk_threshold => 1000
     - :sources => ["http://rubygems.org"]
     - "gem" => "--no-ri --no-rdoc"
  - REMOTE SOURCES:
     - http://rubygems.org

helper_1

## file: C:\ruby193\lib\ruby\site-ruby\devkit.rb

# enable RubyInstaller DevKit usage as a vendorable helper library
unless ENV['PATH'].include?('C:\\DevKit\\mingw\\bin') then
  puts 'Temporarily enhancing PATH to include DevKit...'
  ENV['PATH'] = 'C:\\DevKit\\bin;C:\\DevKit\\mingw\\bin;' + ENV['PATH']
end
ENV['RI_DEVKIT'] = 'C:\\DevKit'
ENV['CC'] = 'gcc'
ENV['CXX'] = 'g++'
ENV['CPP'] = 'cpp'

helper_2

## file: C:\ruby193\lib\ruby\1.9.1\rubygems\defaults\operating_system.rb

# :DK-BEG: override 'gem install' to enable RubyInstaller DevKit usage
Gem.pre_install do |gem_installer|
  unless gem_installer.spec.extensions.empty?
    unless ENV['PATH'].include?('C:\\DevKit\\mingw\\bin') then
      Gem.ui.say 'Temporarily enhancing PATH to include DevKit...' if Gem.configuration.verbose
      ENV['PATH'] = 'C:\\DevKit\\bin;C:\\DevKit\\mingw\\bin;' + ENV['PATH']
    end
    ENV['RI_DEVKIT'] = 'C:\\DevKit'
    ENV['CC'] = 'gcc'
    ENV['CXX'] = 'g++'
    ENV['CPP'] = 'cpp'
  end
end
# :DK-END:

rdiscount install results

C:\Users\Jon>gem install rdiscount
Fetching: rdiscount-1.6.8.gem (100%)
Temporarily enhancing PATH to include DevKit...
Building native extensions.  This could take a while...
Successfully installed rdiscount-1.6.8
1 gem installed


C:\Users\Jon>gem list rdiscount

*** LOCAL GEMS ***

rdiscount (1.6.8)