this derivation will be built:
  /nix/store/kwpc98rvx3rpfbpffm1rx8fakj7nw9ql-inputDerivation-effect-docs-pages.drv
building '/nix/store/kwpc98rvx3rpfbpffm1rx8fakj7nw9ql-inputDerivation-effect-docs-pages.drv'...