anchor.diff:  { stdenv
   , fetchurl
   , dpkg
  +, undmg
   , makeWrapper
   , nodePackages
   , alsaLib
  
positive.code:   };
  
    linux = stdenv.mkDerivation rec {
      inherit pname meta version;
      src = fetchurl {
        url = "https://downloads.slack-edge.com/linux_releases/slack-desktop-${version}-amd64.deb";
        inherit sha256;
      };
  
      rpath = stdenv.lib.makeLibraryPath [
        alsaLib
  
negative.code: }:
  
  let
    inherit (stdenv.hostPlatform) system;
    throwSystem = throw "Unsupported system: ${system}";
  
    pname = "slack";
    version = {
      x86_64-darwin = "4.8.0";
      x86_64-linux = "4.7.0";
    }.${system} or throwSystem;
  
    src = let
      base = "https://downloads.slack-edge.com";
    in {
      x86_64-darwin = fetchurl {
        url = "${base}/releases/macos/${version}/prod/x64/Slack-${version}-macOS.dmg";
        sha256 = "0k22w3c3brbc7ivmc5npqy8h7zxfgnbs7bqwii03psymm6sw53j2";
      };
      x86_64-linux = fetchurl {
        url = "${base}/linux_releases/slack-desktop-${version}-amd64.deb";
        sha256 = "1nwyl70caaz9k0hccfpkjli0jjc6m9zbjb3nf4bwmykpbxbzr9w3";
      };
    }.${system} or throwSystem;
  
    meta = with stdenv.lib; {
  