anchor.diff:    # If an update breaks things, one of those might have valuable info:
     # https://aur.archlinux.org/packages/spotify/
     # https://community.spotify.com/t5/Desktop-Linux
  -  version = "1.1.26.501.gbe11e53b-15";
  +  version = "1.1.42.622.gbd112320-37";
     # To get the latest stable revision:
     # curl -H 'X-Ubuntu-Series: 16' 'https://api.snapcraft.io/api/v1/snaps/details/spotify?channel=stable' | jq '.download_url,.version,.last_updated'
     # To get general information:
     # curl -H 'Snap-Device-Series: 16' 'https://api.snapcraft.io/v2/snaps/info/spotify' | jq '.'
     # More examples of api usage:
     # https://github.com/canonical-websites/snapcraft.io/blob/master/webapp/publisher/snaps/views.py
  -  rev = "41";
  -
  +  rev = "42";
   
     deps = [
       alsaLib
  
positive.code: { fetchurl, stdenv, squashfsTools, xorg, alsaLib, makeWrapper, openssl, freetype
  , glib, pango, cairo, atk, gdk-pixbuf, gtk2, cups, nspr, nss, libpng, libnotify
  , libgcrypt, systemd, fontconfig, dbus, expat, ffmpeg_3, curl, zlib, gnome3
  , at-spi2-atk, at-spi2-core, libpulseaudio
  }:
  
  let
  
negative.code:     gdk-pixbuf
      glib
      gtk2
      libdrm
      libgcrypt
      libnotify
      libpng
      libpulseaudio
      mesa
      nss
      pango
      stdenv.cc.cc
  