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| [https://docs.determinate.systems/determinate-nix/ Determinate Nix] is [https://determinate.systems Determinate Systems]’ enterprise‑grade, validated downstream distribution of NixOS/Nix that retains full compatibility with upstream Nix while adding performance‑boosting features such as parallel evaluation and lazy trees.
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| == Setup ==
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| Add the input <code>determinate</code> and the module <code>determinate.nixosModules.default</code> to your system flake.nix configuration<syntaxhighlight lang="nix">{
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| inputs.determinate.url = "https://flakehub.com/f/DeterminateSystems/determinate/*";
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| inputs.nixpkgs.url = "nixpkgs/nixos-25.11";
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| outputs = { determinate, nixpkgs, ... }: {
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| nixosConfigurations.my-workstation = nixpkgs.lib.nixosSystem {
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| system = "x86_64-linux";
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| modules = [
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| # Load the Determinate module
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| determinate.nixosModules.default
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| ];
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| };
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| };
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| }</syntaxhighlight>After that add the two extra options to your <code>nixos-rebuild</code> command and apply changes<syntaxhighlight lang="bash">
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| sudo nixos-rebuild \
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| --option extra-substituters https://install.determinate.systems \
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| --option extra-trusted-public-keys cache.flakehub.com-3:hJuILl5sVK4iKm86JzgdXW12Y2Hwd5G07qKtHTOcDCM= \
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| --flake ... \
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| switch
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| </syntaxhighlight>
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