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39f064f0e3
The NIXPKGS_CONFIG environment variable and the system-wide /etc/nix/nixpkgs-config.nix path used by NixOS were undocumented in the Nixpkgs manual; the only mention was a release-note from 2006. Add a short paragraph to the Global configuration chapter describing the lookup order, the NixOS-specific default, and the limitation that the file is not generated automatically. Closes #28085.