Qt 5.3. QtWidgets: No such file or directory #include <QtWidgets>
c++, qmake, qt, qt5, qtwidgets
Solution
You need to double check that you completed all these steps:
Module installed
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
You re-run the Qt 5 qmake.
Having said that, I would like to remind you that including the whole module is not a good idea as it includes all the widgets related things. Try to narrow it down to the headers that you really need.
Problem
I want to compile Qt example. I get error QtWidgets: No such file or directory #include ``` greaterThan(QT_MAJOR_VERSION, 4): QT += widgets - does not help QT += widgets - does not help INCLUDEPATH += /opt/Qt/5.3/Src/qtbase/include/ - does not help ``` Qt 5.3. Ubuntu 14.04 x64.