# File lib/bundler/source.rb, line 199
    def add_spec(path, name, version, require_paths = %w(lib))
      raise DirectorySourceError, "already have a gem defined for '#{path}'" if @specs[path.to_s]
      @specs[path.to_s] = Gem::Specification.new do |s|
        s.name     = name
        s.version  = Gem::Version.new(version)
      end
    end