anchor.diff:          package_data = {'openbabel' : ['_openbabel.so']}
       )
       EOF
  -    '';
  +  '';
   
     meta = with lib; {
       description = "A toolbox designed to speak the many languages of chemical data";
  
positive.code:     "-DPYTHON_BINDINGS=ON"
    ];
  
  
    postFixup = ''
      cat <<EOF > $out/lib/python$pythonMajorMinor/site-packages/setup.py
      from distutils.core import setup
  
negative.code: { stdenv, lib, fetchFromGitHub, cmake, zlib, libxml2, eigen, python, cairo, pcre, pkg-config, swig, rapidjson }:
  
  stdenv.mkDerivation rec {
    pname = "openbabel";
    version = "3.1.1";
  
    src = fetchFromGitHub {
      owner = "openbabel";
      repo = "openbabel";
      rev = "openbabel-${lib.replaceStrings ["."] ["-"] version}";
      sha256 = "sha256-wQpgdfCyBAoh4pmj9j7wPTlMtraJ62w/EShxi/olVMY=";
    };
  
    buildInputs = [ zlib libxml2 eigen python cairo pcre swig rapidjson ];
  
  