Project ERROR: Unknown module(s) in QT: webkitwidgets

Question

I am porting code from qt4 to qt5. I added the following line to my .pro file, as suggested:

QT += webkitwidgets

However, when

Answer 1

What works for me is the combination of two answers, I used what @user1251007 suggested + this command

sudo apt-get install libqt5websockets5-dev

find this command line here : link to the stackoverflow response