python3Packages.simple-dftd3: fix installation of parameter file

{

  buildPythonPackage,

  python,

  simple-dftd3,

  cffi,

  numpy,

  preCheck = ''

    find . -name "_libdftd3*" -exec cp {} ./dftd3/. \;

  '';

  pythonImportsCheck = [ "dftd3" ];

  doCheck = true;

  # Parameters need to be present in the python site packages directory, but they

  # are originally only present in the fortran package. This is a consequence of

  # building the python bindings separately from the fortran library.

  postInstall = ''

    ln -s ${simple-dftd3}/share/s-dftd3/parameters.toml $out/${python.sitePackages}/dftd3/.

  '';

}