tce-load -i compiletc efivar-dev

cd efibootmgr-15

edit Make/defaults
prefix	?= /usr/local/
libdir	?= $(prefix)/lib/
CFLAGS	?= 
EFI_LOADER := BOOTX64.EFI

make EFIDIR="/mnt/sdb2/EFI" CC="gcc -flto -fuse-linker-plugin -mtune=generic -Os -pipe" CXX="g++ -flto -fuse-linker-plugin -mtune=generic -Os -pipe -fno-exceptions -fno-rtti"

sudo make install