I got past this only to hit another roadblock- I’ve posted my full journey here: https://github.com/jgarff/rpi_ws281x/issues/289.
I’d suggest:
- Use Raspbian
or
- Use a Unicorn HAT HD
There are issues with AArch64 beyond my understanding or control which means rpi_ws281x support is unlikely, and definitely not going to happen soon if it happens at all.