anchor.diff:      sha256 = "0li992wwd7kgy71bikanqky49y4hq3p3vx35p2hvyxy1k0wfy7i8";
     };
   
  +  buildInputs = [ libyaml ];
     nativeBuildInputs = [ flex bison pkg-config which ] ++ lib.optionals pythonSupport [ python swig ];
   
     postPatch = ''
  
positive.code:   makeFlags = [ "PYTHON=python" ];
    installFlags = [ "INSTALL=install" "PREFIX=$(out)" "SETUP_PREFIX=$(out)" ];
  
    meta = with lib; {
      description = "Device Tree Compiler";
      homepage = "https://git.kernel.org/cgit/utils/dtc/dtc.git";
      license = licenses.gpl2; # dtc itself is GPLv2, libfdt is dual GPL/BSD
      maintainers = [ maintainers.dezgeg ];
      platforms = platforms.unix;
    };
  
negative.code: { stdenv, lib, fetchgit, flex, bison, pkg-config, which
  , pythonSupport ? false, python, swig, libyaml
  }:
  
  stdenv.mkDerivation rec {
    pname = "dtc";
  