anchor.diff:      owner = "OpenOrienteering";
       repo = "mapper";
       rev = "v${version}";
  -    sha256 = "0rw34kp2vd1la97vnk9plwvis6lvyib2bvs7lgkhpnm4p5l7dp1g";
  +    sha256 = "0wnxj2xf529941dwss6ygb1krfx18lzl6rf67060b0zndc7n6l8f";
     };
   
     cmakeFlags =
  
positive.code: 
  stdenv.mkDerivation rec {
    pname = "OpenOrienteering-Mapper";
    version = "0.8.4";
  
    buildInputs = [ gdal qtbase qttools qtlocation qtimageformats
                    qtsensors clipper zlib proj doxygen cups];
  
negative.code:     homepage = https://www.openorienteering.org/apps/mapper/;
      license = licenses.gpl3;
      platforms = with platforms; linux ++ darwin;
      maintainers = with maintainers; [ mpickering sikmir ];
    };
  }
  