default_dir

# File lib/rubygems/defaults.rb, line 30
  def self.default_dir
    path = if defined? RUBY_FRAMEWORK_VERSION then
             [
               File.dirname(RbConfig::CONFIG['sitedir']),
               'Gems',
               RbConfig::CONFIG['ruby_version']
             ]
           elsif RbConfig::CONFIG['rubylibprefix'] then
             [
              RbConfig::CONFIG['rubylibprefix'],
              'gems',
              RbConfig::CONFIG['ruby_version']
             ]
           else
             [
               RbConfig::CONFIG['libdir'],
               ruby_engine,
               'gems',
               RbConfig::CONFIG['ruby_version']
             ]
           end

    @default_dir ||= File.join(*path)
  end