anchor.diff:    meta = with lib; {
       description = "Emulator for rapid prototyping of Software Defined Networks";
       license = {
  -      fullName = "Mininet 2.3.0d4 License";
  +      fullName = "Mininet 2.3.0d6 License";
       };
  +    platforms = platforms.linux;
       homepage = https://github.com/mininet/mininet;
       maintainers = with maintainers; [ teto ];
     };
  
positive.code:     owner = "mininet";
      repo = "mininet";
      rev = version;
      sha256 = "02hsqa7r5ykj8m1ycl32xwn1agjrw78wkq87xif0dl2vkzln41i4";
    };
  
    buildFlags = [ "mnexec" ];
  
negative.code:   pyEnv = python.withPackages(ps: [ ps.setuptools ]);
  in
  stdenv.mkDerivation rec {
    pname = "mininet";
    version = "2.3.0d6";
  
    outputs = [ "out" "py" ];
  
  