this derivation will be built:
  /nix/store/qi9fdm9h7zx13ql38q9h79lz785sx1jx-nixos-anywhere-docs.drv
this path will be fetched (4.9 MiB download, 14.6 MiB unpacked):
  /nix/store/qha2cw54h1qw9xgvmvyik13dj7yzxwp4-mdbook-0.5.4