openbabel: fix python 3.12 compatibility

{ stdenv, lib, fetchFromGitHub, cmake, perl, zlib, libxml2, eigen, python, cairo, pcre, pkg-config, swig, rapidjson }:

{ stdenv

, lib

, fetchFromGitHub

, cmake

, perl

, zlib

, libxml2

, eigen

, python

, cairo

, pcre

, pkg-config

, swig

, rapidjson

}:

stdenv.mkDerivation rec {

  pname = "openbabel";

  nativeBuildInputs = [ cmake pkg-config ];

  pythonMajorMinor = "${python.sourceVersion.major}.${python.sourceVersion.minor}";

  cmakeFlags = [

  preConfigure = ''

    cmakeFlagsArray+=(

      "-DRUN_SWIG=ON"

      "-DPYTHON_BINDINGS=ON"

  ];

      "-DPYTHON_INSTDIR=$out/${python.sitePackages}"

    )

  '';

  # Setuptools only accepts PEP 440 version strings. The "unstable" identifier

  # can not be used. Instead we pretend to be the 3.2 beta release.

  postFixup = ''

    cat <<EOF > $out/lib/python$pythonMajorMinor/site-packages/setup.py

    from distutils.core import setup

    cat << EOF > $out/${python.sitePackages}/setup.py

    from setuptools import setup

    setup(

        name = 'pyopenbabel',