QT project error: Unknown module in QT: widget

Question

I installed the Qwt library (osx) and added it to my Qt project. After executing:

qmake -set QMAKEFEATURES ${QWT_ROOT}/features

I got the project build error:

QT project error: Unknown module in QT: widget

I removed the Qwt library from my project and system but the error is still existing. I also tried to reinstall Qt 5.2.1 and removed all user settings but still the same problem. To check if the property is still there I executed:

qmake -query QMAKEFEATURES

which returned:

**Unknown**

therefore this should not be the problem.

The compiler gives the following output:

ASSERT: "fileName.isEmpty() || isAbsolutePath(fileName)" in file /work/build/qt5_workdir/w/s/qtbase/qmake/library/ioutils.cpp, line 61

Answer 1

I found out there is a bug report in QT: https://bugreports.qt-project.org/browse/QTBUG-29642?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

As I entered the command:

qmake -query

without an argument, it output that the property QMAKEFEATURES was still set:

QMAKEFEATURES:/usr/local/qwt-6.1.1-svn/features

Finally invoking:

qmake -unset QMAKEFEATURES

solved the problem.