anchor.diff: -{ lib, stdenv, fetchFromGitHub, cmake, makeWrapper, openal, fluidsynth_1
  +{ lib, stdenv, fetchFromGitHub, cmake, makeWrapper, openal, fluidsynth
   , soundfont-fluid, libGL, SDL2, bzip2, zlib, libjpeg, libsndfile, mpg123
   , game-music-emu, pkg-config, copyDesktopItems, makeDesktopItem }:
   
  
positive.code: 
    gzdoom = stdenv.mkDerivation rec {
      pname = "gzdoom";
      version = "4.5.0";
  
      src = fetchFromGitHub {
        owner = "coelckers";
        repo = "gzdoom";
        rev = "g${version}";
        sha256 = "0kmqnyhdi5psi7zwrx9j3pz0cplypsvhg4cr8w2jbawh6jb71sk9";
        fetchSubmodules = true;
      };
  
  
negative.code:       SDL2
        libGL
        openal
        fluidsynth
        bzip2
        zlib
        libjpeg
  