anchor.diff:      curl
       dbus
       expat
  -    ffmpeg_3
  +    ffmpeg
       fontconfig
       freetype
       gdk-pixbuf
  
positive.code: { fetchurl, lib, stdenv, squashfsTools, xorg, alsaLib, makeWrapper, openssl, freetype
  , glib, pango, cairo, atk, gdk-pixbuf, gtk3, cups, nspr, nss, libpng, libnotify
  , libgcrypt, systemd, fontconfig, dbus, expat, ffmpeg_3, curl, zlib, gnome3
  , at-spi2-atk, at-spi2-core, libpulseaudio, libdrm, mesa, libxkbcommon
  }:
  
  
negative.code:       ln -s ${nspr.out}/lib/libnspr4.so $libdir/libnspr4.so
        ln -s ${nspr.out}/lib/libplc4.so $libdir/libplc4.so
  
        ln -s ${ffmpeg.out}/lib/libavcodec.so* $libdir
        ln -s ${ffmpeg.out}/lib/libavformat.so* $libdir
  
        rpath="$out/share/spotify:$libdir"
  
  