this derivation will be built:
  /nix/store/19g85vdp3qb076bk8zzimkxxdima1x3c-nixos-anywhere-docs.drv
this path will be fetched (4.8 MiB download, 14.5 MiB unpacked):
  /nix/store/zg6qcvg7yndrw94i518p4rv6bxlbc4vk-mdbook-0.5.4