class Bundler::Source::SystemGems

def install(spec)
  Bundler.ui.debug "  * already installed; skipping"
end

def specs
  @specs ||= begin
    index = Index.new
    Gem::SourceIndex.from_installed_gems.to_a.reverse.each do |name, spec|
      spec.source = self
      index << spec
    end
    index
  end
end

def to_s
  "system gems"
end