I don’t think the Ubuntu 18.04 maintenance people would rebuild this if Ubuntu 18.04 is no longer maintained, but the basic cure would be to rebuild with clang-13 or clang-14 (according to the bug report).
This is something I couldn’t answer. I imagine there are a lot of dependencies, and you’d have to find instructions for building on a PC. Then adapt that to the Jetson (much of it would be the same, but you’d need arm64 versions of tools). I will admit right at the start that this will be a very difficult project even on a desktop PC (if you can find specific instructions from someone, then this will be much easier, but still not easy).