hrm, gem failure

gistfile1.txt

result/bin/eb_deploy --help
/nix/store/0d00q7k7y9nnjppcshq3766xi4l45h60-ruby-2.3.0-p0/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require': cannot load such file -- bundler/setup (LoadError)
        from /nix/store/0d00q7k7y9nnjppcshq3766xi4l45h60-ruby-2.3.0-p0/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
        from result/bin/eb_deploy:16:in `<main>'

gistfile2.txt

{ ruby, bundlerEnv, ... }:

bundlerEnv rec {
  inherit ruby;
  version = "0.6.6";
  name = "eb_deployer-${version}";
  gemset = ./gemset.nix;
  gemfile = ./Gemfile;
  lockfile = ./Gemfile.lock;

  meta = {
    description = "AWS Elastic Beanstalk blue-green deployment automation from ThoughtWorks";
    #don't conflict with other gemfiles.
    priority = 50;
  };
}