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When installing a fresh NixOS system it occasionally happens that you encounter issues that are rather hard to track down since `nixos-install(8)` doesn't provide any debugging flags. This patch adds `-L` to force `nix build` to display the build-log on stderr and `-v` to increase the log-level of Nix.
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.