anchor.diff:      if stdenv.hostPlatform.system == "x86_64-linux" then
         fetchurl {
           url = "https://downloads.slack-edge.com/linux_releases/slack-desktop-${version}-amd64.deb";
  -        sha256 = "0ld53gg0dbfpi79lz2sx5br29mlhwkfcypzf3iya4cm75a33hyw5";
  +        sha256 = "0qbj41ymckz8w1p2pazyxg7pimgn9gmpvxz4ygcm0nyivfmw2crq";
         }
       else
         throw "Slack is not supported on ${stdenv.hostPlatform.system}";
  
positive.code:     nss
      stdenv.cc.cc
      systemd
  
      xorg.libxkbfile
      xorg.libX11
  
negative.code: { darkMode ? false, stdenv, fetchurl, dpkg, makeWrapper , alsaLib, atk, cairo,
  cups, curl, dbus, expat, fontconfig, freetype, glib , gnome2, gtk3, gdk_pixbuf,
  libappindicator-gtk3, libnotify, libxcb, nspr, nss, pango , systemd, xorg,
  at-spi2-atk, libuuid }:
  
  let
  
    version = "3.4.2";
  
    rpath = stdenv.lib.makeLibraryPath [
      alsaLib
  