anchor.diff:  { lib, buildPythonPackage, fetchFromGitHub, fetchpatch, setuptools, cffi
   , paramiko, requests, future, textfsm, jinja2, netaddr, pyyaml, pyeapi, netmiko
   , junos-eznc, ciscoconfparse, scp, lxml, ncclient, pytestCheckHook, ddt, mock
  -, pythonOlder }:
  +, pythonOlder, invoke }:
   
   buildPythonPackage rec {
     pname = "napalm";
  
positive.code:     junos-eznc
      ciscoconfparse
      scp
      lxml
      ncclient
    ];
  
negative.code:       --replace "netmiko>=3.3.0,<4.0.0" "netmiko"
    '';
  
    propagatedBuildInputs = [
      cffi
      paramiko
      requests
      future
      textfsm
      invoke
      jinja2
      netaddr
      pyyaml
  