anchor.diff:  
   stdenv.mkDerivation rec {
     pname = "efl";
  -  version = "1.22.5";
  +  version = "1.23.1";
   
     src = fetchurl {
       url = "http://download.enlightenment.org/rel/libs/${pname}/${pname}-${version}.tar.xz";
  -    sha256 = "1cjk56z0whpzcqwg3xdq23kyp1g83xa67m9dlp7ywmb36bn4ca59";
  +    sha256 = "0q9g4j7k10s1a8rv2ca9v9lydh7ml3zsrqvgncc4qhvdl76208nn";
     };
   
     nativeBuildInputs = [
  +    meson
  +    ninja
       gtk3
       pkgconfig
  +    check
     ];
   
     buildInputs = [
       SDL
  +    avahi
       fontconfig
       freetype
       giflib
  
positive.code:     gst_all_1.gst-plugins-base
      gst_all_1.gst-plugins-good
      gst_all_1.gstreamer
      libGL
      libpng
      libpulseaudio
  
negative.code: { stdenv, fetchurl, meson, ninja, pkgconfig, SDL, SDL2, alsaLib, avahi, bullet, check, curl, dbus,
    doxygen, expat, fontconfig, freetype, fribidi, ghostscript, giflib,
    glib, gst_all_1, gtk3, harfbuzz, ibus, jbig2dec, libGL, libdrm, libinput,
    libjpeg, libpng, libpulseaudio, libraw, librsvg, libsndfile,
    libspectre, libtiff, libwebp, libxkbcommon, luajit, lz4, mesa,
    openjpeg, openssl, poppler, python27Packages, systemd, udev,
  