anchor.diff:  { stdenv, buildPythonApplication, fetchFromGitHub, isPyPy, lib
  -, defusedxml, future, psutil, setuptools
  +, defusedxml, future, packaging, psutil, setuptools
   # Optional dependencies:
   , bottle, pysnmp
   , hddtemp
  
positive.code:     defusedxml
      future
      netifaces
      psutil
      pysnmp
      setuptools
  
negative.code: 
  buildPythonApplication rec {
    pname = "glances";
    version = "3.2.4.2";
    disabled = isPyPy;
  
    src = fetchFromGitHub {
      owner = "nicolargo";
      repo = "glances";
      rev = "v${version}";
      sha256 = "0gql61lrav3f7wbsvgc1d6vf8r0xi5xs9rz9d3sqw3wj5m90w0vq";
    };
  
    # Some tests fail in the sandbox (they e.g. require access to /sys/class/power_supply):
  