tce-load -i compiletc gnu-efi-dev sbsigntool help2man

https://github.com/vathpela/efitools/archive/v1.9.2.tar.gz

install File::Slurp with cpan

cd efitools-1.9.2

find . -name Make.rules -type f -exec sed -i 's/-O2 -g//g' {} \;

make CC="gcc -mtune=generic -Os -pipe -I/usr/local/include/efi -I/usr/local/include/efi/x86_64"
sudo make install

[-flto fails]