this derivation will be built:
  /nix/store/amjfgndy19bz8jrpi47vb6kh9cqbwxw1-inputDerivation-effect-docs-pages.drv
building '/nix/store/amjfgndy19bz8jrpi47vb6kh9cqbwxw1-inputDerivation-effect-docs-pages.drv'...