class Gem::DependencyList

def dependency_order
  sorted = strongly_connected_components.flatten
  result = []
  seen = {}
  sorted.each do |spec|
    if index = seen[spec.name] then
      if result[index].version < spec.version then
        result[index] = spec
      end
    else
      seen[spec.name] = result.length
      result << spec
    end
  end
  result.reverse
end