anchor.diff:      python-dateutil
       retworkx
       scipy
  +    scikit-quant
  +    symengine
       sympy
  +    tweedledum
     ] ++ lib.optionals withVisualization visualizationPackages
  -  ++ lib.optionals withCrosstalkPass crosstalkPackages
  -  ++ lib.optionals withClassicalFunctionCompiler classicalCompilerPackages;
  +  ++ lib.optionals withCrosstalkPass crosstalkPackages;
   
     # *** Tests ***
     checkInputs = [
  
positive.code:   # Crosstalk-adaptive layout pass
  , withCrosstalkPass ? false
  , z3
    # Classical function -> Quantum Circuit compiler
  , withClassicalFunctionCompiler ? true
  , tweedledum
    # test requirements
  , ddt
  , hypothesis
  
negative.code:     owner = "Qiskit";
      repo = pname;
      rev = version;
      sha256 = "sha256-w/EnkdlC1hvmLqm4I8ajEYADxqMYGdHKrySLcb/yWGs=";
    };
  
    nativeBuildInputs = [ cython ];
  