Install QT4 on Ubuntu 20.04

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repository 추가

sudo add-apt-repository ppa:rock-core/qt4
sudo apt update

qt4 설치

sudo apt install qt4-dev-tools qt4-qmake libqt4-dev
sudo apt install qtcreator

qt4 를 디폴트로 설정한다.

sudo apt install qt4-default
qmake -v

컴파일러 설치

sudo apt update; sudo apt install build-essential
gcc -v