anchor.diff: -{ lib, stdenv, buildPythonPackage, buildPackages, makeWrapper, fetchFromGitHub, fetchurl, pkg-config
  +{ lib, stdenv, buildPythonPackage, buildPackages, makeWrapper, fetchFromGitHub, fetchFromGitLab, fetchurl, pkg-config
   , writeTextFile, cmake, ninja, perl, gfortran, python, pybind11, qcelemental, qcengine, numpy, pylibefp
   , deepdiff, blas, lapack, gau2grid, libxc, dkh, dftd3, pcmsolver, libefp, libecpint, cppe
   , chemps2, hdf5, hdf5-cpp, pytest, mpfr, gmpxx, eigen, boost, adcc
  
positive.code:       cd build
      '';
    });
  
    /* This is libint built with high maximum angular momentum. The code generator
       first runs to generate libint itself and then builds. Will take forever ...
  
negative.code:       # CheMPS2
        "-DENABLE_CheMPS2=ON"
        # Prefix path for all external packages
        "-DCMAKE_PREFIX_PATH=\"${gau2grid};${libxc_};${qcelemental};${pcmsolver_};${dkh_};${libefp};${chemps2_};${libint};${libecpint};${cppe}\""
        # ADCC
        "-DENABLE_adcc=ON"
      ];
  