tce-load -wi compiletc

https://git.zx2c4.com/wireguard-tools/snapshot/wireguard-tools-1.0.20210914.zip

cd wireguard-tools-1.0.20210914/src

Makefile edits:
PREFIX ?= /usr/local
WITH_WGQUICK ?= yes
WITH_SYSTEMDUNITS ?= no

CC="gcc -flto -fuse-linker-plugin -mtune=generic -Os -pipe" CXX="g++ -flto -fuse-linker-plugin -mtune=generic -Os -pipe -fno-exceptions -fno-rtti" make

sudo make install

copy "stat" utility from GNU coreutils to extension's /usr/local/bin/