{ config, pkgs, self, ... }:
{
  nixpkgs = {
    config = {
      allowUnfree = true;
      allowBroken = true;
      allowInsecure = true;
    };
    overlays = [
      self.overlays.default
    ];
  };

  nix = {
    extraOptions = ''
      experimental-features = nix-command flakes
    '';
    settings = {
      auto-optimise-store = true;
      trusted-users = [ "root" "natto" ];
      substituters = [
        "https://nix-gaming.cachix.org"
        "https://nix-community.cachix.org"
        #       "https://mirrors.tuna.tsinghua.edu.cn/nix-channels/store"
      ];
      trusted-public-keys = [
        "nix-gaming.cachix.org-1:nbjlureqMbRAxR1gJ/f3hxemL9svXaZF/Ees8vCUUs4="
        "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
      ];
    };
  };
}