anchor.diff:  
   buildPythonPackage rec {
     pname = "qiskit-aqua";
  -  version = "0.8.2";
  +  version = "0.9.0";
   
     disabled = pythonOlder "3.6";
   
  
positive.code:     owner = "Qiskit";
      repo = "qiskit-aqua";
      rev = version;
      sha256 = "sha256-ybf8bXqsVk6quYi0vrfo/Mplk7Nr7tQS7cevXxI9khw=";
    };
  
    # Optional packages: pyscf (see below NOTE) & pytorch. Can install via pip/nix if needed.
  
negative.code:   # We disable appropriate tests below to allow building without pyscf installed
  
    postPatch = ''
      # Because this is a legacy/final release, the maintainers restricted the maximum
      # versions of all dependencies to the latest current version. That will not
      # work with nixpkgs' rolling release/update system.
      # Unlock all versions for compatibility
      substituteInPlace setup.py --replace "<=" ">="
      sed -i 's/\(\w\+-*\w*\).*/\1/' requirements.txt
      substituteInPlace requirements.txt --replace "dataclasses" ""
  
      # Add ImportWarning when running qiskit.chemistry (pyscf is a chemistry package) that pyscf is not included
      echo -e "\nimport warnings\ntry: import pyscf;\nexcept ImportError:\n    " \
  