# File lib/rspec/core/configuration_options.rb, line 11
      def configure(config)
        keys = options.keys
        keys.unshift(:requires) if keys.delete(:requires)
        keys.unshift(:libs)     if keys.delete(:libs)
        
        formatters = options[:formatters] if keys.delete(:formatters)
        
        config.exclusion_filter.merge! options[:exclusion_filter] if keys.delete(:exclusion_filter)
        
        keys.each do |key|
          config.send("#{key}=", options[key]) if config.respond_to?("#{key}=")
        end
        
        formatters.each {|pair| config.add_formatter(*pair) } if formatters
      end