Ubuntu – Project ERROR: Unknown module(s) in QT: positioning

I have error Project ERROR: Unknown module(s) in QT: positioning when I'm trying to build QT5 dependent project with qmake, I suspect that problem can be in old QT4 installation that was installed before.

qmake -version
QMake version 3.0
Using Qt version 5.2.1 in /usr/lib/x86_64-linux-gnu

So my questions are:

1.How to resolve this error?

2.How to completelly remove Qt4 (and maybe reinstall QT5?)?

Update:

which qmake
/usr/bin/qmake

ls -l /usr/bin/qmake
lrwxrwxrwx 1 root root 9 апр.   4  2016 /usr/bin/qmake -> qtchooser

dpkg -l|grep qt5|grep qmake
ii  qt5-qmake:amd64                                       5.2.1+dfsg-1ubuntu14.3                              amd64        Qt 5 qmake Makefile generator tool

qt5-qmake
lots of output like /usr/lib/x86_64-linux-gnu/qt5/*
/usr/lib/x86_64-linux-gnu/qt5/bin
/usr/lib/x86_64-linux-gnu/qt5/bin/qmake

qtchooser -list-versions
4
5
default
qt4-x86_64-linux-gnu
qt4
qt5-x86_64-linux-gnu
qt5

qtchooser -print-env
QT_SELECT="default"
QTTOOLDIR="/usr/lib/x86_64-linux-gnu/qt5/bin"
QTLIBDIR="/usr/lib/x86_64-linux-gnu"

After I set export QT_SELECT=qt5:

qtchooser -print-env
QT_SELECT="qt5"
QTTOOLDIR="/usr/lib/x86_64-linux-gnu/qt5/bin"
QTLIBDIR="/usr/lib/x86_64-linux-gnu"

Also I have tried:

qtchooser -run-tool=qmake -qt=qt5 ../src

But I still have same error.