class Gem::DependencyInstaller

def initialize(options = {})
  @only_install_dir = !options[:install_dir].nil?
  @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]
  @dir_mode = options[:dir_mode]
  @data_mode = options[:data_mode]
  @prog_mode = options[:prog_mode]
  # 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