question: project-error-unknown-modules-in-qt-webkitwidgets-webkit
os: ubuntu16.04 LTS-32bit
qmake version: QMake Version 3.0 Using Qt verson 5.5.1 in /usr/lib.i386-linux-gnu
Answer:
#include <QtWebKitWidgets>
and - with QT += webkit #include <QtWebKit>
if still project-error-unknown-modules-in-qt-webkitwidgets-webkit
then:
check if libqt5webkit is installed
sudo apt-get install libqt5webkit5-dev