anchor.diff:      libxml2
       libtiff
     ] ++ lib.optional enableX11 libX11;
  +
  +  enableParallelBuilding = true;
  +
  +  postPatch = ''
  +    # Install libnetpbm.so symlink to correct destination
  +    substituteInPlace lib/Makefile \
  +      --replace '/sharedlink' '/lib'
  +  '';
   
     configurePhase = ''
       runHook preConfigure
  
positive.code: { lib
  , stdenv
  , fetchsvn
  , pkgconfig
  , libjpeg
  , libpng
  , flex
  
negative.code:     sha256 = "1m7ks6k53gsjsdazgf22g16dfgj3pqvqy9mhxzlwszv5808sj5w5";
    };
  
    nativeBuildInputs = [
      pkg-config
      flex
      makeWrapper
    ];
  