anchor.diff:            package = pkgs.i3-gaps;
             # i3 dependencies.
             extraPackages = with pkgs; [
  -            (i3pystatus.overrideAttrs(oldAttrs: {
  -              src = fetchFromGitHub {
  -                owner = "thiagokokada";
  -                repo = "i3pystatus";
  -                rev = "a85b06e7a3712ecbea589512525d096cc41b22b0";
  -                sha256 = "0jk8c1bv78vd3idv503d6128ljpydvaw5a2ynpzgcppvr9843vwj";
  -              };
  -              propagatedBuildInputs = with python3Packages;
  -              oldAttrs.propagatedBuildInputs ++ [
  -                dbus-python
  -                i3ipc
  -                pysensors
  -              ];
  -            }))
               compton-git
               dex
               dmenu
               dunst
               ffmpeg
               i3lock
  -            i3status
               libnotify
               lm_sensors
               maim
  
positive.code:             pavucontrol
              playerctl
              rofi
              wmctrl
              xdg-user-dirs
              xorg.xdpyinfo
              xorg.xkill
              xorg.xset
  
negative.code: { config, pkgs, ... }:
  
  let
    unstable = import (builtins.fetchGit {
      name = "nixos-unstable-2019-07-15";
      url = https://github.com/nixos/nixpkgs/;
      rev = "5d678d1a39d65e65556b719c48b975cd345dbe49";
    }) {
      config = config.nixpkgs.config;
    };
  in
  
  {
    environment = {
  