add_install_update_options

# File lib/rubygems/install_update_options.rb, line 20
  def add_install_update_options
    add_option(:"Install/Update", '-i', '--install-dir DIR',
               'Gem repository directory to get installed',
               'gems') do |value, options|
      options[:install_dir] = File.expand_path(value)
    end

    add_option(:"Install/Update", '-n', '--bindir DIR',
               'Directory where binary files are',
               'located') do |value, options|
      options[:bin_dir] = File.expand_path(value)
    end

    add_option(:"Install/Update",       '--[no-]document [TYPES]', Array,
               'Generate documentation for installed gems',
               'List the documentation types you wish to',
               'generate.  For example: rdoc,ri') do |value, options|
      options[:document] = case value
                           when nil   then ]ri]
                           when false then []
                           else            value
                           end
    end

    add_option(:"Install/Update", '--build-root DIR',
               'Temporary installation root. Useful for building',
               'packages. Do not use this when installing remote gems.') do |value, options|
      options[:build_root] = File.expand_path(value)
    end

    add_option(:"Install/Update", '--vendor',
               'Install gem into the vendor directory.',
               'Only for use by gem repackagers.') do |value, options|
      unless Gem.vendor_dir then
        raise OptionParser::InvalidOption.new 'your platform is not supported'
      end

      options[:vendor] = true
      options[:install_dir] = Gem.vendor_dir
    end

    add_option(:"Install/Update", '-N', '--no-document',
               'Disable documentation generation') do |value, options|
      options[:document] = []
    end

    add_option(:Deprecated, '--[no-]rdoc',
               'Generate RDoc for installed gems',
               'Use --document instead') do |value, options|
      if value then
        options[:document] << 'rdoc'
      else
        options[:document].delete 'rdoc'
      end

      options[:document].uniq!
    end

    add_option(:Deprecated, '--[no-]ri',
               'Generate ri data for installed gems.',
               'Use --document instead') do |value, options|
      if value then
        options[:document] << 'ri'
      else
        options[:document].delete 'ri'
      end

      options[:document].uniq!
    end

    add_option(:"Install/Update", '-E', '--[no-]env-shebang',
               "Rewrite the shebang line on installed",
               "scripts to use /usr/bin/env") do |value, options|
      options[:env_shebang] = value
    end

    add_option(:"Install/Update", '-f', '--[no-]force',
               'Force gem to install, bypassing dependency',
               'checks') do |value, options|
      options[:force] = value
    end

    add_option(:"Install/Update", '-w', '--[no-]wrappers',
               'Use bin wrappers for executables',
               'Not available on dosish platforms') do |value, options|
      options[:wrappers] = value
    end

    add_security_option

    add_option(:"Install/Update", '--ignore-dependencies',
               'Do not install any required dependent gems') do |value, options|
      options[:ignore_dependencies] = value
    end

    add_option(:"Install/Update",       '--[no-]format-executable',
               'Make installed executable names match Ruby.',
               'If Ruby is ruby18, foo_exec will be',
               'foo_exec18') do |value, options|
      options[:format_executable] = value
    end

    add_option(:"Install/Update",       '--[no-]user-install',
               'Install in user\s home directory instead',
               'of GEM_HOME.') do |value, options|
      options[:user_install] = value
    end

    add_option(:"Install/Update", "--development",
                "Install additional development",
                "dependencies") do |value, options|
      options[:development] = true
      options[:dev_shallow] = true
    end

    add_option(:"Install/Update", "--development-all",
                "Install development dependencies for all",
                "gems (including dev deps themselves)") do |value, options|
      options[:development] = true
      options[:dev_shallow] = false
    end

    add_option(:"Install/Update", "--conservative",
                "Don't attempt to upgrade gems already",
                "meeting version requirement") do |value, options|
      options[:conservative] = true
      options[:minimal_deps] = true
    end

    add_option(:"Install/Update", "--minimal-deps",
                "Don't upgrade any dependencies that already",
                "meet version requirements") do |value, options|
      options[:minimal_deps] = true
    end

    add_option(:"Install/Update", "--[no-]post-install-message",
                "Print post install message") do |value, options|
      options[:post_install_message] = value
    end

    add_option(:"Install/Update", '-g', '--file [FILE]',
               'Read from a gem dependencies API file and',
               'install the listed gems') do |v,o|
      v = Gem::GEM_DEP_FILES.find do |file|
        File.exist? file
      end unless v

      unless v then
        message = v ? v : "(tried #{Gem::GEM_DEP_FILES.join ', '})"

        raise OptionParser::InvalidArgument,
                "cannot find gem dependencies file #{message}"
      end

      options[:gemdeps] = v
    end

    add_option(:"Install/Update", '--without GROUPS', Array,
               'Omit the named groups (comma separated)',
               'when installing from a gem dependencies',
               'file') do |v,o|
      options[:without_groups].concat v.map { |without| without.intern }
    end

    add_option(:"Install/Update", '--default',
               'Add the gem\s full specification to',
               'specifications/default and extract only its bin') do |v,o|
      options[:install_as_default] = v
    end

    add_option(:"Install/Update", '--explain',
               'Rather than install the gems, indicate which would',
               'be installed') do |v,o|
      options[:explain] = v
    end

    add_option(:"Install/Update", '--[no-]lock',
               'Create a lock file (when used with -g/--file)') do |v,o|
      options[:lock] = v
    end

    add_option(:"Install/Update", '--[no-]suggestions',
               'Suggest alternates when gems are not found') do |v,o|
      options[:suggest_alternate] = v
    end

  end