this derivation will be built:
  /nix/store/978snzxwqx4vzrz3wqg4rmkm2j7jhkfz-inputDerivation-gh-pages.drv
building '/nix/store/978snzxwqx4vzrz3wqg4rmkm2j7jhkfz-inputDerivation-gh-pages.drv'...