anchor.diff:  
   stdenv.mkDerivation rec {
     name = "gzdoom-${version}";
  -  version = "2.3.2";
  +  version = "3.0.1";
   
     src = fetchFromGitHub {
       owner = "coelckers";
       repo = "gzdoom";
       rev = "g${version}";
  -    sha256 = "1ys7wl4ygvm2lm49qjpql6c5i8gydmbg4f436bcpkywf5srr6xrd";
  +    sha256 = "0s0hl7pa2gr3cm884q7np5naybhv4hqhbfd3s45a8hdf72n6c9cm";
     };
   
     nativeBuildInputs = [ cmake makeWrapper ];
  
positive.code:   meta = with stdenv.lib; {
      homepage = "https://github.com/coelckers/gzdoom";
      description = "A Doom source port based on ZDoom. It features an OpenGL renderer and lots of new features";
      # Doom source license, MAME license
      license = licenses.unfreeRedistributable;
      platforms = platforms.linux;
      maintainers = with maintainers; [ lassulus ];
    };
  
negative.code:     sed -i \
        -e "s@/usr/share/sounds/sf2/@${soundfont-fluid}/share/soundfonts/@g" \
        -e "s@FluidR3_GM.sf2@FluidR3_GM2-2.sf2@g" \
        src/sound/mididevices/music_fluidsynth_mididevice.cpp
    '';
  
    installPhase = ''
  