anchor.diff:    # https://community.spotify.com/t5/Desktop-Linux/Redistribute-Spotify-on-Linux-Distributions/td-p/1695334
     src = fetchurl {
       url = "https://api.snapcraft.io/api/v1/snaps/download/pOBIoZ2LrCB3rDohMxoYGnbN14EHOgD7_${rev}.snap";
  -    sha512 = "859730fbc80067f0828f7e13eee9a21b13b749f897a50e17c2da4ee672785cfd79e1af6336e609529d105e040dc40f61b6189524783ac93d49f991c4ea8b3c56";
  +    sha512 = "9c2b7c2c6da28fa0c1d75d1ff77aa50604e3d60716f6bfe2b3da452d5d89c9c53c819921a60e1997a8cc42d07d7c15460f707ac5d21180fbb2dcc006e7b0e82b";
     };
   
     buildInputs = [ squashfsTools makeWrapper ];
  
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
  }:
  
  let
  
negative.code:   # 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 = "1.1.5.153.gf614956d-16";
    # 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 = "35";
  
  
    deps = [
      alsaLib
      atk
      at-spi2-atk
      at-spi2-core
      cairo
      cups
      curl
  