anchor.diff:  { lib
  +, stdenv
   , buildPythonPackage
   , fetchPypi
   , isPy27
  
positive.code: 
  buildPythonPackage rec {
    pname = "sounddevice";
    version = "0.4.3";
    disabled = isPy27;
  
    src = fetchPypi {
      inherit pname version;
      sha256 = "f1667a7467b65fac4c4ebf668b4e9698eb7333fc3d32bc3c7ec9839ea7cb6c20";
    };
  
    propagatedBuildInputs = [ cffi numpy portaudio ];
  
negative.code:   patches = [
      (substituteAll {
        src = ./fix-portaudio-library-path.patch;
        portaudio = "${portaudio}/lib/libportaudio${stdenv.hostPlatform.extensions.sharedLibrary}";
      })
    ];
  
  