anchor.diff:  
     src = fetchurl {
       url = "mirror://gnome/sources/meld/${minor}/meld-${version}.tar.xz";
  -    sha256 = "02kcnlavlxlk8df456zppmin9xzdvgkw151nskb6f0bwmi9zs6rl";
  +    sha256 = "1bec697aa1ababa315ca8241ade65dc68ea87f0d316632f590975afcf967cfab";
     };
   
     buildInputs = [
  
positive.code:     homepage = http://meldmerge.org/;
      license = stdenv.lib.licenses.gpl2;
      platforms = platforms.linux ++ stdenv.lib.platforms.darwin;
    };
  }
  
negative.code: 
  let
    minor = "3.16";
    version = "${minor}.1";
  in
  
  buildPythonApplication rec {
  