this derivation will be built:
  /nix/store/s7ycb2s8clhmvm7d1d36b4l6bxp370yy-inputDerivation-gh-pages.drv
building '/nix/store/s7ycb2s8clhmvm7d1d36b4l6bxp370yy-inputDerivation-gh-pages.drv'...