anchor.diff:      libpng
       libvorbis
       openal
  -    python2
  +    python3
       zlib
     ]
     ++ optional withVLC libvlc;
  
positive.code: , libvlc
  , libvorbis
  , openal
  , python2 # 0.9.0 crashes after character generation with py3, so stick to py2 for now
  , zlib
  }:
  
  
negative.code: in
  stdenv.mkDerivation rec {
    pname = "gemrb";
    version = "0.9.1";
  
    src = fetchFromGitHub {
      owner = "gemrb";
      repo = "gemrb";
      rev = "v${version}";
      hash = "sha256-xc59Iyrmbmo7Kxio0lLpvVlpdoeM/vfmBLkJdzJsSPY=";
    };
  
    buildInputs = [
  