Function prefs_register_enum_preference 

pub unsafe extern "C" fn prefs_register_enum_preference(
    module: *mut module_t,
    name: *const c_char,
    title: *const c_char,
    description: *const c_char,
    var: *mut gint,
    enumvals: *const enum_val_t,
    radio_buttons: gboolean,
)