anchor.diff:  
   buildPythonPackage rec {
     pname = "dotnetcore2";
  -  version = "2.1.11";
  +  version = "2.1.13";
     format = "wheel";
     disabled = isPy27;
   
  
positive.code:     )
    ];
  
    # unfortunately the noraml pip install fails because the manylinux1 format check fails with NixOS
    installPhase = ''
      mkdir -p $out/${python.sitePackages}/${pname}
      # copy metadata
      cp -r dotnetcore2-2* $out/${python.sitePackages}
      # copy non-dotnetcore related files
      cp -r dotnetcore2/{__init__.py,runtime.py} $out/${python.sitePackages}/${pname}
    '';
  
    # no tests, ensure it's one useful function works
  
negative.code:     inherit pname version format;
      python = "py3";
      platform = "manylinux1_x86_64";
      sha256 = "1fbg3pn7g0a6pg0gb5vaapcc3cdp6wfnliim57fn3cnzmx5d8p6i";
    };
  
    nativeBuildInputs = [ unzip ];
  