anchor.diff:      owner = "mininet";
       repo = "mininet";
       rev = version;
  -    sha256 = "02hsqa7r5ykj8m1ycl32xwn1agjrw78wkq87xif0dl2vkzln41i4";
  +    sha256 = "0wc6gni9dxj9jjnw66a28jdvcfm8bxv1i776m5dh002bn5wjcl6x";
     };
   
     buildFlags = [ "mnexec" ];
  
positive.code:   meta = with lib; {
      description = "Emulator for rapid prototyping of Software Defined Networks";
      license = {
        fullName = "Mininet 2.3.0d4 License";
      };
      homepage = https://github.com/mininet/mininet;
      maintainers = with maintainers; [ teto ];
    };
  
negative.code:   pyEnv = python.withPackages(ps: [ ps.setuptools ]);
  in
  stdenv.mkDerivation rec {
    pname = "mininet";
    version = "2.3.0d6";
  
    outputs = [ "out" "py" ];
  
  