anchor.diff:  , networkx
   , numpy
   , psutil
  -, python
   , qiskit-ignis
   , qiskit-terra
   , quandl
  
positive.code:       >> qiskit/optimization/__init__.py
    '';
  
    postInstall = "rm -rf $out/${python.sitePackages}/docs";  # Remove docs dir b/c it can cause conflicts.
  
    checkInputs = [
      pytestCheckHook
      ddt
  
negative.code:     owner = "Qiskit";
      repo = "qiskit-aqua";
      rev = version;
      hash = "sha256-fptyqPrkUgl3UjtlEmDYORdX/SsONxWozQGEs/EahmU=";
    };
  
    # Optional packages: pyscf (see below NOTE) & pytorch. Can install via pip/nix if needed.
  