Override Nix Package

override.nix

{

# NixPkgs Overrides
  nixpkgs.config = {
    allowUnfree = true;
    packageOverrides = super: let self = super.pkgs; in {

      polybar = super.polybar.override (old: {
         i3Support = true;
      });
      
    };
  };

  environment.systemPackages = with pkgs; [
    polybar
];

}