this is a set x11 window opacity tool
using qt5
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sudo apt install qt5-qmake qtbase5-dev qttools5-dev-tools libxcb-ewmh-dev libqt5x11extras5-dev libx11-xcb-dev
sudo apt install pkg-config, dpkg-dev
mkdir build
cd build
qmake ..
make
make install
dpkg-buildpackage -b -us -uc