tce-load -i compiletc

wget https://github.com/Cyan4973/xxHash/archive/refs/tags/v0.8.3.tar.gz

cd xxHash-0.8.3

edit Makefile
CFLAGS ?=

make CC="gcc -flto -march=armv8-a+crc -mtune=cortex-a72 -Os -pipe" CXX="g++ -flto -march=armv8-a+crc -mtune=cortex-a72 -Os -pipe -fno-exceptions -fno-rtti" 

sudo make CC="gcc -flto -march=armv8-a+crc -mtune=cortex-a72 -Os -pipe" CXX="g++ -flto -march=armv8-a+crc -mtune=cortex-a72 -Os -pipe -fno-exceptions -fno-rtti" install