these 4 derivations will be built:
  /nix/store/75qgn4i1qr6s1bscdgxyjmdxknk6pczv-nix-tarmac-0.1.0.drv
  /nix/store/78fkl892km8hqbqas3y1f3qiz52962dk-nix-tarmac-0.1.0.drv
  /nix/store/pc32rx9g9xcs84ww58hzn0jc6z1gndgg-nix-tarmac-0.1.0.drv
  /nix/store/lnskya7vzgcf2k3ngj7yiji8frxmghw0-nix-tarmac-dispatcher.drv