{ self, unstable, nixpkgs-crystal, ... } @ inputs:

{
  alpha = self.lib.mkSystem {
    name = "alpha";
    nixpkgs = unstable;
    extraModules = [
      inputs.sops-nix.nixosModules.sops
      inputs.impermanence.nixosModules.impermanence
    ];
  };

  haruka = self.lib.mkSystem {
    name = "haruka";
    nixpkgs = unstable;
    extraModules = [
      inputs.sops-nix.nixosModules.sops
      inputs.impermanence.nixosModules.impermanence
    ];
  };

  kanata = self.lib.mkSystem {
    name = "kanata";
    nixpkgs = unstable;
    extraModules = [
      inputs.sops-nix.nixosModules.sops
      inputs.impermanence.nixosModules.impermanence
    ];
    overlays = [
      (final: prev: {
        # https://github.com/NixOS/nixpkgs/pull/286273
        inherit (nixpkgs-crystal.legacyPackages.x86_64-linux)
          crystal invidious;
      })
    ];
  };
}