anchor.diff:    ];
   
     buildInputs = [
  +    # has to go before others to override transitive libpng-1.6
  +    libpng
  +
       bzip2
       expat
  +    freetype
       irrlicht
  +    libICE
       libGL
       libGLU
  +    libSM
  +    libX11
  +    libXext
       libXxf86vm
       libjpeg
  -    libpng
       libvorbis
       openal
       sqlite
  -    xlibsWrapper
     ];
   
     meta = with lib; {
  
positive.code: , bzip2
  , cmake
  , expat
  , irrlicht
  , libGL
  , libGLU
  , libXxf86vm
  , libjpeg
  , libpng
  
negative.code: , openal
  , pkg-config
  , sqlite
  }:
  
  stdenv.mkDerivation rec {
  