This is the Qookie README file apt install build-essential add-apt-repository -y ppa:ubuntu-toolchain-r/test apt install -y g++-11 update-alternatives --remove-all gcc update-alternatives --remove-all g++ update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-11 10 update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-11 10 g++ --version apt-get install qt5-default apt install libsqlite3-dev apt install qtcreator #(cd src; for h in `grep Q_OBJECT *.h | cut -d: -f1`; do moc $h > moc_$h; done) moc mainwindow.h > moc_mainwindow.cc