these 2 derivations will be built:
  /nix/store/7chpxrmqpn5k4b50yd3vi6dnfyg62d5i-agent-slack-0.10.2.drv
  /nix/store/45qqcdwwm2z9r5l113rsbp319qvqn3n2-check-agent-slack.drv