anchor.diff:  
       runHook postConfigure
     '';
  -
  -  enableParallelBuilding = true;
   
     installPhase = ''
       runHook preInstall
  
positive.code:     sha256 = "1m7ks6k53gsjsdazgf22g16dfgj3pqvqy9mhxzlwszv5808sj5w5";
    };
  
    postPatch = ''
      # Install libnetpbm.so symlink to correct destination
      substituteInPlace lib/Makefile \
        --replace '/sharedlink' '/lib'
    '';
  
    nativeBuildInputs = [
      pkgconfig
      flex
      makeWrapper
    ];
  
negative.code:     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
  