these 2 derivations will be built:
  /nix/store/n04v94kwgzkm9ijwg1dq9qbm2r91x1qf-horae-0.1.0.drv
  /nix/store/38fixc5qn36w1wbgzqiwm4clxqpv0k9q-horae-browser-checks.drv