class Gem::Specification

def activate_dependencies
  unresolved = Gem::Specification.unresolved_deps
  self.runtime_dependencies.each do |spec_dep|
    if loaded = Gem.loaded_specs[spec_dep.name]
      next if spec_dep.matches_spec? loaded
      msg = "can't satisfy '#{spec_dep}', already activated '#{loaded.full_name}'"
      e = Gem::LoadError.new msg
      e.name = spec_dep.name
      raise e
    end
    specs = spec_dep.to_specs
    if specs.size == 1 then
      specs.first.activate
    else
      name = spec_dep.name
      unresolved[name] = unresolved[name].merge spec_dep
    end
  end
  unresolved.delete self.name
end