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Since #76542 this workaround is required to use a FQDN as hostname. See #94011 and #94022 for the related discussion. Due to some potential/unresolved issues (legacy software, backward compatibility, etc.) we're documenting this workaround [0]. [0]: https://github.com/NixOS/nixpkgs/issues/94011#issuecomment-705952300
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.