these 2 derivations will be built:
  /nix/store/p79cxg0hd7adq37y8j9zbpf27vj3x794-effect-root.drv
  /nix/store/9r223iavb589s9ncilvmc7r3pmgb41q0-inputDerivation-gh-pages.drv
building '/nix/store/p79cxg0hd7adq37y8j9zbpf27vj3x794-effect-root.drv'...
building '/nix/store/9r223iavb589s9ncilvmc7r3pmgb41q0-inputDerivation-gh-pages.drv'...