{
  lib,
  inputs,
  system,
  ...
}: {
  nixpkgs.channels.default = {
    # nixpkgs (stable branch)
    pkgs = {
      inherit system;
      source = inputs.nixpkgs;
      overlays =
        [inputs.dobutterfliescry-net.overlays.default]
        ++ import ./overlays/default.nix;
      config = {
        # allowUnfree = false;
        allowBroken = false;
        allowUnfreePredicate = pkg:
          builtins.elem (lib.getName pkg) [
            "discord"
            "steam"
            "steamcmd"
            "steam-unwrapped"

            "obsidian"
            "gitkraken"
          ];
      };
    };
    # nixpkgs-unstable
    upkgs = {
      inherit system;
      source = inputs.nixpkgs-unstable;
      overlays =
        [inputs.dobutterfliescry-net.overlays.default]
        ++ import ./overlays/default.nix;
      config = {
        allowUnfree = false;
        allowBroken = false;
      };
    };
  };
}