these 2 derivations will be built:
  /nix/store/kln50vz179v5mhikcy9pmmlk5swl5k1a-nix-grpc-store-0.2.3.drv
  /nix/store/djrjdmny3bdb0djgsjnzm1dcwh9vppr6-nix-grpc-store-dispatcher.drv