anchor.diff:  
   buildPythonPackage rec {
     pname = "qiskit-ignis";
  -  version = "0.4.0";
  +  version = "0.5.1";
   
     disabled = pythonOlder "3.6";
   
  
positive.code:     owner = "Qiskit";
      repo = "qiskit-ignis";
      rev = version;
      sha256 = "07mxhaknkp121xm6mgrpcrbj9qw6j924ra3k0s6vr8qgvfcxvh0y";
    };
  
    propagatedBuildInputs = [
      numpy
      qiskit-terra
      scikitlearn
      scipy
    ];
    postInstall = "rm -rf $out/${python.sitePackages}/docs";  # this dir can create conflicts
  
    # Tests
    pythonImportsCheck = [ "qiskit.ignis" ];
  
negative.code:   ];
    disabledTests = [
      "test_tensored_meas_cal_on_circuit" # Flaky test, occasionally returns result outside bounds
      "test_qv_fitter" # execution hangs, ran for several minutes
    ];
  
    meta = with lib; {
  