anchor.diff:      attrs
       click
       construct
  +    construct-classes
       ecdsa
       hidapi
       libusb1
  
positive.code: , attrs
  , click
  , construct
  , ecdsa
  , hidapi
  , libusb1
  
negative.code: 
  buildPythonPackage rec {
    pname = "trezor";
    version = "0.13.4";
  
    disabled = !isPy3k;
  
    src = fetchPypi {
      inherit pname version;
      sha256 = "04a77b44005971819386bbd55242a1004b1f88fbbdb829deb039a1e0028a4af1";
    };
  
    nativeBuildInputs = [ installShellFiles ];
  