anchor.diff:  
     nativeBuildInputs = [ cmake ];
   
  -  buildInputs = [ orcania ];
  +  buildInputs = [ orcania ] ++ lib.optional withSystemd systemd;
   
     checkInputs = [ check subunit ];
   
     cmakeFlags = [
       "-DBUILD_YDER_TESTING=on"
  -  ];
  +  ] ++ lib.optional (!withSystemd) "-DWITH_JOURNALD=off";
   
     doCheck = true;
   
  
positive.code: { stdenv, lib, fetchFromGitHub, cmake, orcania, systemd, check, subunit }:
  stdenv.mkDerivation rec {
    pname = "yder";
    version = "1.4.6";
  
negative.code:     homepage = "https://github.com/babelouest/yder";
      license = licenses.lgpl21;
      maintainers = with maintainers; [ johnazoidberg ];
      platforms = platforms.all;
    };
  }
  