these 2 derivations will be built:
  /nix/store/18hi9d6hgw2dsrb0dzdx92963jycfsxv-nix-grpc-store-0.2.3.drv
  /nix/store/4yrmkh1gdjr20kffa64y7ppqckiw6cvj-nix-grpc-store-dispatcher.drv