def build_extensions(self) -> None:
        """
        Build extensions, injecting C++ std for Pybind11Extension if needed.
        """

        for ext in self.extensions:
            if hasattr(ext, "_cxx_level") and ext._cxx_level == 0:
                ext.cxx_std = auto_cpp_level(self.compiler)

        super().build_extensions()

        Build extensions, injecting C++ std for Pybind11Extension if needed.
        
deps/pybind11/pybind11/setup_helpers.py