anchor.diff:  
     src = fetchurl {
       url = "https://github.com/MarshallOfSound/Google-Play-Music-Desktop-Player-UNOFFICIAL-/releases/download/v${version}/google-play-music-desktop-player_${version}_amd64.deb";
  -    sha256 = "06h9g1yhd5q7gg8v55q143fr65frxg0khfgckr03gsaw0swin51q";
  +    sha256 = "0dyn2fxhcri9d9nmcprszs6yg79gsr09bjfzzb1p10yjmi77cj2g";
     };
   
     dontBuild = true;
  
positive.code: { stdenv, alsaLib, atk, cairo, cups, dbus, dpkg, expat, fontconfig, freetype
  , fetchurl, GConf, gdk_pixbuf, glib, gtk2, libpulseaudio, makeWrapper, nspr
  , nss, pango, udev, xorg
  }:
  
  let
    version = "4.5.0";
  
    deps = [
      alsaLib
  
negative.code:     gdk_pixbuf
      glib
      gtk2
      gtk3
      libpulseaudio
      nspr
      nss
  