these 2 derivations will be built:
  /nix/store/l7yqqw75bdqhb34a530b9bijww0nml8c-nix-grpc-store-0.2.2.drv
  /nix/store/ld0vvnpi8hwmx8cy1brbnby892s9rx3g-nix-grpc-store-dispatcher.drv