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diff --git a/jni/ruby/lib/rubygems/commands/setup_command.rb b/jni/ruby/lib/rubygems/commands/setup_command.rb
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+require 'rubygems/command'
+
+##
+# Installs RubyGems itself.  This command is ordinarily only available from a
+# RubyGems checkout or tarball.
+
+class Gem::Commands::SetupCommand < Gem::Command
+  HISTORY_HEADER = /^===\s*[\d.]+\s*\/\s*\d{4}-\d{2}-\d{2}\s*$/
+  VERSION_MATCHER = /^===\s*([\d.]+)\s*\/\s*\d{4}-\d{2}-\d{2}\s*$/
+
+  def initialize
+    require 'tmpdir'
+
+    super 'setup', 'Install RubyGems',
+          :format_executable => true, :document => %w[ri],
+          :site_or_vendor => 'sitelibdir',
+          :destdir => '', :prefix => '', :previous_version => ''
+
+    add_option '--previous-version=VERSION',
+               'Previous version of rubygems',
+               'Used for changelog processing' do |version, options|
+      options[:previous_version] = version
+    end
+
+    add_option '--prefix=PREFIX',
+               'Prefix path for installing RubyGems',
+               'Will not affect gem repository location' do |prefix, options|
+      options[:prefix] = File.expand_path prefix
+    end
+
+    add_option '--destdir=DESTDIR',
+               'Root directory to install RubyGems into',
+               'Mainly used for packaging RubyGems' do |destdir, options|
+      options[:destdir] = File.expand_path destdir
+    end
+
+    add_option '--[no-]vendor',
+               'Install into vendorlibdir not sitelibdir' do |vendor, options|
+      options[:site_or_vendor] = vendor ? 'vendorlibdir' : 'sitelibdir'
+    end
+
+    add_option '--[no-]format-executable',
+               'Makes `gem` match ruby',
+               'If ruby is ruby18, gem will be gem18' do |value, options|
+      options[:format_executable] = value
+    end
+
+    add_option '--[no-]document [TYPES]', Array,
+               'Generate documentation for RubyGems.',
+               'List the documentation types you wish to',
+               'generate.  For example: rdoc,ri' do |value, options|
+      options[:document] = case value
+                           when nil   then %w[rdoc ri]
+                           when false then []
+                           else            value
+                           end
+    end
+
+    add_option '--[no-]rdoc',
+               'Generate RDoc documentation for RubyGems' do |value, options|
+      if value then
+        options[:document] << 'rdoc'
+      else
+        options[:document].delete 'rdoc'
+      end
+
+      options[:document].uniq!
+    end
+
+    add_option '--[no-]ri',
+               'Generate RI documentation for RubyGems' do |value, options|
+      if value then
+        options[:document] << 'ri'
+      else
+        options[:document].delete 'ri'
+      end
+
+      options[:document].uniq!
+    end
+
+    @verbose = nil
+  end
+
+  def check_ruby_version
+    required_version = Gem::Requirement.new '>= 1.8.7'
+
+    unless required_version.satisfied_by? Gem.ruby_version then
+      alert_error "Expected Ruby version #{required_version}, is #{Gem.ruby_version}"
+      terminate_interaction 1
+    end
+  end
+
+  def defaults_str # :nodoc:
+    "--format-executable --document ri"
+  end
+
+  def description # :nodoc:
+    <<-EOF
+Installs RubyGems itself.
+
+RubyGems installs RDoc for itself in GEM_HOME.  By default this is:
+  #{Gem.dir}
+
+If you prefer a different directory, set the GEM_HOME environment variable.
+
+RubyGems will install the gem command with a name matching ruby's
+prefix and suffix.  If ruby was installed as `ruby18`, gem will be
+installed as `gem18`.
+
+By default, this RubyGems will install gem as:
+  #{Gem.default_exec_format % 'gem'}
+    EOF
+  end
+
+  def execute
+    @verbose = Gem.configuration.really_verbose
+
+    install_destdir = options[:destdir]
+
+    unless install_destdir.empty? then
+      ENV['GEM_HOME'] ||= File.join(install_destdir,
+                                    Gem.default_dir.gsub(/^[a-zA-Z]:/, ''))
+    end
+
+    check_ruby_version
+
+    require 'fileutils'
+    if Gem.configuration.really_verbose then
+      extend FileUtils::Verbose
+    else
+      extend FileUtils
+    end
+
+    lib_dir, bin_dir = make_destination_dirs install_destdir
+
+    install_lib lib_dir
+
+    install_executables bin_dir
+
+    remove_old_bin_files bin_dir
+
+    remove_old_lib_files lib_dir
+
+    say "RubyGems #{Gem::VERSION} installed"
+
+    uninstall_old_gemcutter
+
+    documentation_success = install_rdoc
+
+    say
+    if @verbose then
+      say "-" * 78
+      say
+    end
+
+    if options[:previous_version].empty?
+      options[:previous_version] = Gem::VERSION.sub(/[0-9]+$/, '0')
+    end
+
+    options[:previous_version] = Gem::Version.new(options[:previous_version])
+
+    show_release_notes
+
+    say
+    say "-" * 78
+    say
+
+    say "RubyGems installed the following executables:"
+    say @bin_file_names.map { |name| "\t#{name}\n" }
+    say
+
+    unless @bin_file_names.grep(/#{File::SEPARATOR}gem$/) then
+      say "If `gem` was installed by a previous RubyGems installation, you may need"
+      say "to remove it by hand."
+      say
+    end
+
+    if documentation_success
+      if options[:document].include? 'rdoc' then
+        say "Rdoc documentation was installed. You may now invoke:"
+        say "  gem server"
+        say "and then peruse beautifully formatted documentation for your gems"
+        say "with your web browser."
+        say "If you do not wish to install this documentation in the future, use the"
+        say "--no-document flag, or set it as the default in your ~/.gemrc file. See"
+        say "'gem help env' for details."
+        say
+      end
+
+      if options[:document].include? 'ri' then
+        say "Ruby Interactive (ri) documentation was installed. ri is kind of like man "
+        say "pages for ruby libraries. You may access it like this:"
+        say "  ri Classname"
+        say "  ri Classname.class_method"
+        say "  ri Classname#instance_method"
+        say "If you do not wish to install this documentation in the future, use the"
+        say "--no-document flag, or set it as the default in your ~/.gemrc file. See"
+        say "'gem help env' for details."
+        say
+      end
+    end
+  end
+
+  def install_executables(bin_dir)
+    say "Installing gem executable" if @verbose
+
+    @bin_file_names = []
+
+    Dir.chdir 'bin' do
+      bin_files = Dir['*']
+
+      bin_files.delete 'update_rubygems'
+
+      bin_files.each do |bin_file|
+        bin_file_formatted = if options[:format_executable] then
+                               Gem.default_exec_format % bin_file
+                             else
+                               bin_file
+                             end
+
+        dest_file = File.join bin_dir, bin_file_formatted
+        bin_tmp_file = File.join Dir.tmpdir, "#{bin_file}.#{$$}"
+
+        begin
+          bin = File.readlines bin_file
+          bin[0] = "#!#{Gem.ruby}\n"
+
+          File.open bin_tmp_file, 'w' do |fp|
+            fp.puts bin.join
+          end
+
+          install bin_tmp_file, dest_file, :mode => 0755
+          @bin_file_names << dest_file
+        ensure
+          rm bin_tmp_file
+        end
+
+        next unless Gem.win_platform?
+
+        begin
+          bin_cmd_file = File.join Dir.tmpdir, "#{bin_file}.bat"
+
+          File.open bin_cmd_file, 'w' do |file|
+            file.puts <<-TEXT
+@ECHO OFF
+IF NOT "%~f0" == "~f0" GOTO :WinNT
+@"#{File.basename(Gem.ruby).chomp('"')}" "#{dest_file}" %1 %2 %3 %4 %5 %6 %7 %8 %9
+GOTO :EOF
+:WinNT
+@"#{File.basename(Gem.ruby).chomp('"')}" "%~dpn0" %*
+TEXT
+          end
+
+          install bin_cmd_file, "#{dest_file}.bat", :mode => 0755
+        ensure
+          rm bin_cmd_file
+        end
+      end
+    end
+  end
+
+  def install_file file, dest_dir
+    dest_file = File.join dest_dir, file
+    dest_dir = File.dirname dest_file
+    mkdir_p dest_dir unless File.directory? dest_dir
+
+    install file, dest_file, :mode => 0644
+  end
+
+  def install_lib(lib_dir)
+    say "Installing RubyGems" if @verbose
+
+    lib_files = rb_files_in 'lib'
+    pem_files = pem_files_in 'lib'
+
+    Dir.chdir 'lib' do
+      lib_files.each do |lib_file|
+        install_file lib_file, lib_dir
+      end
+
+      pem_files.each do |pem_file|
+        install_file pem_file, lib_dir
+      end
+    end
+  end
+
+  def install_rdoc
+    gem_doc_dir = File.join Gem.dir, 'doc'
+    rubygems_name = "rubygems-#{Gem::VERSION}"
+    rubygems_doc_dir = File.join gem_doc_dir, rubygems_name
+
+    begin
+      Gem.ensure_gem_subdirectories Gem.dir
+    rescue SystemCallError
+      # ignore
+    end
+
+    if File.writable? gem_doc_dir and
+       (not File.exist? rubygems_doc_dir or
+        File.writable? rubygems_doc_dir) then
+      say "Removing old RubyGems RDoc and ri" if @verbose
+      Dir[File.join(Gem.dir, 'doc', 'rubygems-[0-9]*')].each do |dir|
+        rm_rf dir
+      end
+
+      require 'rubygems/rdoc'
+
+      fake_spec = Gem::Specification.new 'rubygems', Gem::VERSION
+      def fake_spec.full_gem_path
+        File.expand_path '../../../..', __FILE__
+      end
+
+      generate_ri   = options[:document].include? 'ri'
+      generate_rdoc = options[:document].include? 'rdoc'
+
+      rdoc = Gem::RDoc.new fake_spec, generate_rdoc, generate_ri
+      rdoc.generate
+
+      return true
+    elsif @verbose then
+      say "Skipping RDoc generation, #{gem_doc_dir} not writable"
+      say "Set the GEM_HOME environment variable if you want RDoc generated"
+    end
+
+    return false
+  end
+
+  def make_destination_dirs(install_destdir)
+    lib_dir, bin_dir = Gem.default_rubygems_dirs
+
+    unless lib_dir
+      lib_dir, bin_dir = generate_default_dirs(install_destdir)
+    end
+
+    mkdir_p lib_dir
+    mkdir_p bin_dir
+
+    return lib_dir, bin_dir
+  end
+
+  def generate_default_dirs(install_destdir)
+    prefix = options[:prefix]
+    site_or_vendor = options[:site_or_vendor]
+
+    if prefix.empty? then
+      lib_dir = RbConfig::CONFIG[site_or_vendor]
+      bin_dir = RbConfig::CONFIG['bindir']
+    else
+      # Apple installed RubyGems into libdir, and RubyGems <= 1.1.0 gets
+      # confused about installation location, so switch back to
+      # sitelibdir/vendorlibdir.
+      if defined?(APPLE_GEM_HOME) and
+        # just in case Apple and RubyGems don't get this patched up proper.
+        (prefix == RbConfig::CONFIG['libdir'] or
+         # this one is important
+         prefix == File.join(RbConfig::CONFIG['libdir'], 'ruby')) then
+         lib_dir = RbConfig::CONFIG[site_or_vendor]
+         bin_dir = RbConfig::CONFIG['bindir']
+      else
+        lib_dir = File.join prefix, 'lib'
+        bin_dir = File.join prefix, 'bin'
+      end
+    end
+
+    unless install_destdir.empty? then
+      lib_dir = File.join install_destdir, lib_dir.gsub(/^[a-zA-Z]:/, '')
+      bin_dir = File.join install_destdir, bin_dir.gsub(/^[a-zA-Z]:/, '')
+    end
+
+    [lib_dir, bin_dir]
+  end
+
+  def pem_files_in dir
+    Dir.chdir dir do
+      Dir[File.join('**', '*pem')]
+    end
+  end
+
+  def rb_files_in dir
+    Dir.chdir dir do
+      Dir[File.join('**', '*rb')]
+    end
+  end
+
+  def remove_old_bin_files(bin_dir)
+    old_bin_files = {
+      'gem_mirror' => 'gem mirror',
+      'gem_server' => 'gem server',
+      'gemlock' => 'gem lock',
+      'gemri' => 'ri',
+      'gemwhich' => 'gem which',
+      'index_gem_repository.rb' => 'gem generate_index',
+    }
+
+    old_bin_files.each do |old_bin_file, new_name|
+      old_bin_path = File.join bin_dir, old_bin_file
+      next unless File.exist? old_bin_path
+
+      deprecation_message = "`#{old_bin_file}` has been deprecated.  Use `#{new_name}` instead."
+
+      File.open old_bin_path, 'w' do |fp|
+        fp.write <<-EOF
+#!#{Gem.ruby}
+
+abort "#{deprecation_message}"
+    EOF
+      end
+
+      next unless Gem.win_platform?
+
+      File.open "#{old_bin_path}.bat", 'w' do |fp|
+        fp.puts %{@ECHO.#{deprecation_message}}
+      end
+    end
+  end
+
+  def remove_old_lib_files lib_dir
+    rubygems_dir = File.join lib_dir, 'rubygems'
+    lib_files = rb_files_in 'lib/rubygems'
+
+    old_lib_files = rb_files_in rubygems_dir
+
+    to_remove = old_lib_files - lib_files
+
+    to_remove.delete_if do |file|
+      file.start_with? 'defaults'
+    end
+
+    Dir.chdir rubygems_dir do
+      to_remove.each do |file|
+        FileUtils.rm_f file
+
+        warn "unable to remove old file #{file} please remove it by hand" if
+          File.exist? file
+      end
+    end
+  end
+
+  def show_release_notes
+    release_notes = File.join Dir.pwd, 'History.txt'
+
+    release_notes =
+      if File.exist? release_notes then
+        history = File.read release_notes
+
+        history.force_encoding Encoding::UTF_8 if
+          Object.const_defined? :Encoding
+
+        history = history.sub(/^# coding:.*?(?=^=)/m, '')
+
+        text = history.split(HISTORY_HEADER)
+        text.shift # correct an off-by-one generated by split
+        version_lines = history.scan(HISTORY_HEADER)
+        versions = history.scan(VERSION_MATCHER).flatten.map do |x|
+          Gem::Version.new(x)
+        end
+
+        history_string = ""
+
+        until versions.length == 0 or
+              versions.shift < options[:previous_version] do
+          history_string += version_lines.shift + text.shift
+        end
+
+        history_string
+      else
+        "Oh-no! Unable to find release notes!"
+      end
+
+    say release_notes
+  end
+
+  def uninstall_old_gemcutter
+    require 'rubygems/uninstaller'
+
+    ui = Gem::Uninstaller.new('gemcutter', :all => true, :ignore => true,
+                              :version => '< 0.4')
+    ui.uninstall
+  rescue Gem::InstallError
+  end
+
+end
+