tce-load -i compiletc

wget https://github.com/rhboot/efivar/archive/39/efivar-39.tar.gz

cd efivar-39

edit src/include.defaults.mk
prefix	?= /usr/local/
libdir	?= $(prefix)/lib/
OPTIMIZE ?= 
CFLAGS	?= $(OPTIMIZE)

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

sudo make install