# install either Qt 4.8 or 5.x. and make sure it's in PKG_CONFIG_PATH
sudo apt-get update
export PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/lib/x86_64-linux-gnu/pkgconfig
export PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/bin
pkg-config --modversion Qt5
echo $PKG_CONFIG_PATH
sudo apt install qt5-default
sudo apt-get install qtbase5-dev
# sudo apt install qttools5-dev-tools
# sudo apt-get install apt-file
# sudo apt-file update
# apt-file find Qt5.pc
make xconfig