install qt4-qmake ubuntu
sudo add-apt-repository ppa:rock-core/qt4
sudo apt update
sudo apt install qt4-default
sudo apt install qt4-qmake
#to remove it
sudo add-apt-repository --remove ppa:rock-core/qt4install qt4-qmake ubuntu
sudo add-apt-repository ppa:rock-core/qt4
sudo apt update
sudo apt install qt4-default
sudo apt install qt4-qmake
#to remove it
sudo add-apt-repository --remove ppa:rock-core/qt4install qt designer python ubuntu
sudo apt-get install qttools5-dev-tools
sudo apt-get install qttools5-devCopyright © 2021 Codeinu
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