anchor.diff:      owner = "Qiskit";
       repo = "qiskit";
       rev = version;
  -    sha256 = "0p1sahgf6qgbkvxb067mnyj6ya8nv7y57yyiiaadhjw242sjkjy5";
  +    sha256 = "0liby6ffgrla6wr4k742qkg8m80im372p6hmr4gkz47nmc76zy1i";
     };
   
     propagatedBuildInputs = [
  
positive.code:   checkInputs = [ pytestCheckHook ];
    dontUseSetuptoolsCheck = true;
    # following doesn't work b/c they are distributed across different nix sitePackages dirs. Tested with pytest though.
    # pythonImportsCheck = [ "qiskit" "qiskit.terra" "qiskit.ignis" "qiskit.aer" "qiskit.aqua" ];
  
    meta = {
      description = "Software for developing quantum computing programs";
  
negative.code: buildPythonPackage rec {
    pname = "qiskit";
    # NOTE: This version denotes a specific set of subpackages. See https://qiskit.org/documentation/release_notes.html#version-history
    version = "0.19.6";
  
    disabled = pythonOlder "3.5";
  
  