def out_of_date?(stamp)
      all_prerequisite_tasks.any? { |prereq|
        prereq_task = application[prereq, @scope]
        if prereq_task.instance_of?(Rake::FileTask)
          prereq_task.timestamp > stamp || @application.options.build_all
        else
          prereq_task.timestamp > stamp
        end
      }
    end
def out_of_date?(stamp)
      all_prerequisite_tasks.any? { |prereq|
        prereq_task = application[prereq, @scope]
        if prereq_task.instance_of?(Rake::FileTask)
          prereq_task.timestamp > stamp || @application.options.build_all
        else
          prereq_task.timestamp > stamp
        end
      }
    end
Are there any prerequisites with a later time than the given time stamp?