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Conform to RFC 1123 [0], specifically to "2.1 Host Names and Numbers", which allow starting host name with alphanumerical instead of alphabetical characters. RFC 1123 updates RFC 952 [1], which is referenced in "man 5 hosts". [0]: https://tools.ietf.org/html/rfc1123 [1]: https://tools.ietf.org/html/rfc952
To build the manual, you need Nix installed on your system (no need
for NixOS). To install Nix, follow the instructions at
https://nixos.org/nix/download.html
When you have Nix on your system, in the root directory of the project
(i.e., `nixpkgs`), run:
nix-build nixos/release.nix -A manual.x86_64-linux
When this command successfully finishes, it will tell you where the
manual got generated.