this derivation will be built:
  /nix/store/yp9j9id4ggcgalpk7bwnaxh67nrf1yxv-nixos-anywhere-docs.drv
this path will be fetched (4.4 MiB download, 12.8 MiB unpacked):
  /nix/store/j8jnn4fg5fs0xvi8j7b3s7n77h1rsfbk-mdbook-0.5.4