tce-load -i compiletc python3.9-dev docbook_xsl

wget https://files.itstool.org/itstool/itstool-2.0.7.tar.bz2

cd itstool-2.0.7

PYTHON=/usr/local/bin/python3 CC="gcc -flto -mtune=generic -Os -pipe" CXX="g++ -flto -mtune=generic -Os -pipe -fno-exceptions -fno-rtti" ./configure --prefix=/usr/local --localstatedir=/var

make
sudo make install