these 2 derivations will be built:
  /nix/store/grlpnvyakmf8m96fwafkljmnbr2l7x3i-nix-grpc-store-0.1.0-beta.4.drv
  /nix/store/lr7rir3n4hxdz24c584dsn8y1qafsypx-nix-grpc-store-dispatcher.drv