these 2 derivations will be built:
  /nix/store/18b0dc8y95bb1h4x8bws1i5m378a4l6v-nix-grpc-store-0.2.2.drv
  /nix/store/sivm2dcps8y6g02pvplmn33bhwih1y51-nix-grpc-store-dispatcher.drv