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diff --git a/jni/ruby/lib/rubygems/dependency_installer.rb b/jni/ruby/lib/rubygems/dependency_installer.rb
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+++ b/jni/ruby/lib/rubygems/dependency_installer.rb
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+require 'rubygems'
+require 'rubygems/dependency_list'
+require 'rubygems/package'
+require 'rubygems/installer'
+require 'rubygems/spec_fetcher'
+require 'rubygems/user_interaction'
+require 'rubygems/source'
+require 'rubygems/available_set'
+
+##
+# Installs a gem along with all its dependencies from local and remote gems.
+
+class Gem::DependencyInstaller
+
+  include Gem::UserInteraction
+
+  DEFAULT_OPTIONS = { # :nodoc:
+    :env_shebang         => false,
+    :document            => %w[ri],
+    :domain              => :both, # HACK dup
+    :force               => false,
+    :format_executable   => false, # HACK dup
+    :ignore_dependencies => false,
+    :prerelease          => false,
+    :security_policy     => nil, # HACK NoSecurity requires OpenSSL. AlmostNo? Low?
+    :wrappers            => true,
+    :build_args          => nil,
+    :build_docs_in_background => false,
+    :install_as_default  => false
+  }.freeze
+
+  ##
+  # Documentation types.  For use by the Gem.done_installing hook
+
+  attr_reader :document
+
+  ##
+  # Errors from SpecFetcher while searching for remote specifications
+
+  attr_reader :errors
+
+  ##
+  #--
+  # TODO remove, no longer used
+
+  attr_reader :gems_to_install # :nodoc:
+
+  ##
+  # List of gems installed by #install in alphabetic order
+
+  attr_reader :installed_gems
+
+  ##
+  # Creates a new installer instance.
+  #
+  # Options are:
+  # :cache_dir:: Alternate repository path to store .gem files in.
+  # :domain:: :local, :remote, or :both.  :local only searches gems in the
+  #           current directory.  :remote searches only gems in Gem::sources.
+  #           :both searches both.
+  # :env_shebang:: See Gem::Installer::new.
+  # :force:: See Gem::Installer#install.
+  # :format_executable:: See Gem::Installer#initialize.
+  # :ignore_dependencies:: Don't install any dependencies.
+  # :install_dir:: See Gem::Installer#install.
+  # :prerelease:: Allow prerelease versions.  See #install.
+  # :security_policy:: See Gem::Installer::new and Gem::Security.
+  # :user_install:: See Gem::Installer.new
+  # :wrappers:: See Gem::Installer::new
+  # :build_args:: See Gem::Installer::new
+
+  def initialize options = {}
+    @only_install_dir = !!options[:install_dir]
+    @install_dir = options[:install_dir] || Gem.dir
+    @build_root = options[:build_root]
+
+    options = DEFAULT_OPTIONS.merge options
+
+    @bin_dir             = options[:bin_dir]
+    @dev_shallow         = options[:dev_shallow]
+    @development         = options[:development]
+    @document            = options[:document]
+    @domain              = options[:domain]
+    @env_shebang         = options[:env_shebang]
+    @force               = options[:force]
+    @format_executable   = options[:format_executable]
+    @ignore_dependencies = options[:ignore_dependencies]
+    @prerelease          = options[:prerelease]
+    @security_policy     = options[:security_policy]
+    @user_install        = options[:user_install]
+    @wrappers            = options[:wrappers]
+    @build_args          = options[:build_args]
+    @build_docs_in_background = options[:build_docs_in_background]
+    @install_as_default  = options[:install_as_default]
+
+    # Indicates that we should not try to update any deps unless
+    # we absolutely must.
+    @minimal_deps        = options[:minimal_deps]
+
+    @available      = nil
+    @installed_gems = []
+    @toplevel_specs = nil
+
+    @cache_dir = options[:cache_dir] || @install_dir
+
+    @errors = []
+  end
+
+  ##
+  #--
+  # TODO remove, no longer used
+
+  def add_found_dependencies to_do, dependency_list # :nodoc:
+    seen = {}
+    dependencies = Hash.new { |h, name| h[name] = Gem::Dependency.new name }
+
+    until to_do.empty? do
+      spec = to_do.shift
+
+      # HACK why is spec nil?
+      next if spec.nil? or seen[spec.name]
+      seen[spec.name] = true
+
+      deps = spec.runtime_dependencies
+
+      if @development
+        if @dev_shallow
+          if @toplevel_specs.include? spec.full_name
+            deps |= spec.development_dependencies
+          end
+        else
+          deps |= spec.development_dependencies
+        end
+      end
+
+      deps.each do |dep|
+        dependencies[dep.name] = dependencies[dep.name].merge dep
+
+        if @minimal_deps
+          next if Gem::Specification.any? do |installed_spec|
+                    dep.name == installed_spec.name and
+                      dep.requirement.satisfied_by? installed_spec.version
+                  end
+        end
+
+        results = find_gems_with_sources(dep)
+
+        results.sorted.each do |t|
+          to_do.push t.spec
+        end
+
+        results.remove_installed! dep
+
+        @available << results
+        results.inject_into_list dependency_list
+      end
+    end
+
+    dependency_list.remove_specs_unsatisfied_by dependencies
+  end
+
+  ##
+  # Creates an AvailableSet to install from based on +dep_or_name+ and
+  # +version+
+
+  def available_set_for dep_or_name, version # :nodoc:
+    if String === dep_or_name then
+      find_spec_by_name_and_version dep_or_name, version, @prerelease
+    else
+      dep = dep_or_name.dup
+      dep.prerelease = @prerelease
+      @available = find_gems_with_sources dep
+    end
+
+    @available.pick_best!
+  end
+
+  ##
+  # Indicated, based on the requested domain, if local
+  # gems should be considered.
+
+  def consider_local?
+    @domain == :both or @domain == :local
+  end
+
+  ##
+  # Indicated, based on the requested domain, if remote
+  # gems should be considered.
+
+  def consider_remote?
+    @domain == :both or @domain == :remote
+  end
+
+  ##
+  # Returns a list of pairs of gemspecs and source_uris that match
+  # Gem::Dependency +dep+ from both local (Dir.pwd) and remote (Gem.sources)
+  # sources.  Gems are sorted with newer gems preferred over older gems, and
+  # local gems preferred over remote gems.
+
+  def find_gems_with_sources dep, best_only=false # :nodoc:
+    set = Gem::AvailableSet.new
+
+    if consider_local?
+      sl = Gem::Source::Local.new
+
+      if spec = sl.find_gem(dep.name)
+        if dep.matches_spec? spec
+          set.add spec, sl
+        end
+      end
+    end
+
+    if consider_remote?
+      begin
+        # TODO this is pulled from #spec_for_dependency to allow
+        # us to filter tuples before fetching specs.
+        #
+        tuples, errors = Gem::SpecFetcher.fetcher.search_for_dependency dep
+
+        if best_only && !tuples.empty?
+          tuples.sort! { |a,b| b[0].version <=> a[0].version }
+          tuples = [tuples.first]
+        end
+
+        specs = []
+        tuples.each do |tup, source|
+          begin
+            spec = source.fetch_spec(tup)
+          rescue Gem::RemoteFetcher::FetchError => e
+            errors << Gem::SourceFetchProblem.new(source, e)
+          else
+            specs << [spec, source]
+          end
+        end
+
+        if @errors
+          @errors += errors
+        else
+          @errors = errors
+        end
+
+        set << specs
+
+      rescue Gem::RemoteFetcher::FetchError => e
+        # FIX if there is a problem talking to the network, we either need to always tell
+        # the user (no really_verbose) or fail hard, not silently tell them that we just
+        # couldn't find their requested gem.
+        verbose do
+          "Error fetching remote data:\t\t#{e.message}\n" \
+            "Falling back to local-only install"
+        end
+        @domain = :local
+      end
+    end
+
+    set
+  end
+
+  ##
+  # Finds a spec and the source_uri it came from for gem +gem_name+ and
+  # +version+.  Returns an Array of specs and sources required for
+  # installation of the gem.
+
+  def find_spec_by_name_and_version gem_name,
+                                    version = Gem::Requirement.default,
+                                    prerelease = false
+    set = Gem::AvailableSet.new
+
+    if consider_local?
+      if gem_name =~ /\.gem$/ and File.file? gem_name then
+        src = Gem::Source::SpecificFile.new(gem_name)
+        set.add src.spec, src
+      elsif gem_name =~ /\.gem$/ then
+        Dir[gem_name].each do |name|
+          begin
+            src = Gem::Source::SpecificFile.new name
+            set.add src.spec, src
+          rescue Gem::Package::FormatError
+          end
+        end
+      else
+        local = Gem::Source::Local.new
+
+        if s = local.find_gem(gem_name, version)
+          set.add s, local
+        end
+      end
+    end
+
+    if set.empty?
+      dep = Gem::Dependency.new gem_name, version
+      dep.prerelease = true if prerelease
+
+      set = find_gems_with_sources(dep, true)
+      set.match_platform!
+    end
+
+    if set.empty?
+      raise Gem::SpecificGemNotFoundException.new(gem_name, version, @errors)
+    end
+
+    @available = set
+  end
+
+  ##
+  # Gathers all dependencies necessary for the installation from local and
+  # remote sources unless the ignore_dependencies was given.
+  #--
+  # TODO remove at RubyGems 3
+
+  def gather_dependencies # :nodoc:
+    specs = @available.all_specs
+
+    # these gems were listed by the user, always install them
+    keep_names = specs.map { |spec| spec.full_name }
+
+    if @dev_shallow
+      @toplevel_specs = keep_names
+    end
+
+    dependency_list = Gem::DependencyList.new @development
+    dependency_list.add(*specs)
+    to_do = specs.dup
+    add_found_dependencies to_do, dependency_list unless @ignore_dependencies
+
+    # REFACTOR maybe abstract away using Gem::Specification.include? so
+    # that this isn't dependent only on the currently installed gems
+    dependency_list.specs.reject! { |spec|
+      not keep_names.include?(spec.full_name) and
+      Gem::Specification.include?(spec)
+    }
+
+    unless dependency_list.ok? or @ignore_dependencies or @force then
+      reason = dependency_list.why_not_ok?.map { |k,v|
+        "#{k} requires #{v.join(", ")}"
+      }.join("; ")
+      raise Gem::DependencyError, "Unable to resolve dependencies: #{reason}"
+    end
+
+    @gems_to_install = dependency_list.dependency_order.reverse
+  end
+
+  def in_background what # :nodoc:
+    fork_happened = false
+    if @build_docs_in_background and Process.respond_to?(:fork)
+      begin
+        Process.fork do
+          yield
+        end
+        fork_happened = true
+        say "#{what} in a background process."
+      rescue NotImplementedError
+      end
+    end
+    yield unless fork_happened
+  end
+
+  ##
+  # Installs the gem +dep_or_name+ and all its dependencies.  Returns an Array
+  # of installed gem specifications.
+  #
+  # If the +:prerelease+ option is set and there is a prerelease for
+  # +dep_or_name+ the prerelease version will be installed.
+  #
+  # Unless explicitly specified as a prerelease dependency, prerelease gems
+  # that +dep_or_name+ depend on will not be installed.
+  #
+  # If c-1.a depends on b-1 and a-1.a and there is a gem b-1.a available then
+  # c-1.a, b-1 and a-1.a will be installed.  b-1.a will need to be installed
+  # separately.
+
+  def install dep_or_name, version = Gem::Requirement.default
+    request_set = resolve_dependencies dep_or_name, version
+
+    @installed_gems = []
+
+    options = {
+      :bin_dir             => @bin_dir,
+      :build_args          => @build_args,
+      :document            => @document,
+      :env_shebang         => @env_shebang,
+      :force               => @force,
+      :format_executable   => @format_executable,
+      :ignore_dependencies => @ignore_dependencies,
+      :prerelease          => @prerelease,
+      :security_policy     => @security_policy,
+      :user_install        => @user_install,
+      :wrappers            => @wrappers,
+      :build_root          => @build_root,
+      :install_as_default  => @install_as_default
+    }
+    options[:install_dir] = @install_dir if @only_install_dir
+
+    request_set.install options do |_, installer|
+      @installed_gems << installer.spec if installer
+    end
+
+    @installed_gems.sort!
+
+    # Since this is currently only called for docs, we can be lazy and just say
+    # it's documentation. Ideally the hook adder could decide whether to be in
+    # the background or not, and what to call it.
+    in_background "Installing documentation" do
+      Gem.done_installing_hooks.each do |hook|
+        hook.call self, @installed_gems
+      end
+    end unless Gem.done_installing_hooks.empty?
+
+    @installed_gems
+  end
+
+  def install_development_deps # :nodoc:
+    if @development and @dev_shallow then
+      :shallow
+    elsif @development then
+      :all
+    else
+      :none
+    end
+  end
+
+  def resolve_dependencies dep_or_name, version # :nodoc:
+    request_set = Gem::RequestSet.new
+    request_set.development         = @development
+    request_set.development_shallow = @dev_shallow
+    request_set.soft_missing = @force
+    request_set.prerelease = @prerelease
+    request_set.remote = false unless consider_remote?
+
+    installer_set = Gem::Resolver::InstallerSet.new @domain
+    installer_set.ignore_installed = @only_install_dir
+
+    if consider_local?
+      if dep_or_name =~ /\.gem$/ and File.file? dep_or_name then
+        src = Gem::Source::SpecificFile.new dep_or_name
+        installer_set.add_local dep_or_name, src.spec, src
+        version = src.spec.version if version == Gem::Requirement.default
+      elsif dep_or_name =~ /\.gem$/ then
+        Dir[dep_or_name].each do |name|
+          begin
+            src = Gem::Source::SpecificFile.new name
+            installer_set.add_local dep_or_name, src.spec, src
+          rescue Gem::Package::FormatError
+          end
+        end
+      # else This is a dependency. InstallerSet handles this case
+      end
+    end
+
+    dependency =
+      if spec = installer_set.local?(dep_or_name) then
+        Gem::Dependency.new spec.name, version
+      elsif String === dep_or_name then
+        Gem::Dependency.new dep_or_name, version
+      else
+        dep_or_name
+      end
+
+    dependency.prerelease = @prerelease
+
+    request_set.import [dependency]
+
+    installer_set.add_always_install dependency
+
+    request_set.always_install = installer_set.always_install
+
+    if @ignore_dependencies then
+      installer_set.ignore_dependencies = true
+      request_set.ignore_dependencies   = true
+      request_set.soft_missing          = true
+    end
+
+    request_set.resolve installer_set
+
+    @errors.concat request_set.errors
+
+    request_set
+  end
+
+end