Q:

QT version is not properly installed, please run make install

I installed QT-creator from a downloaded copy of qt-creator-linux-x86-opensource-2.6.1.bin using 
sudo ./qt-creator-linux-x86-opensource-2.6.1.bin 

in Ubuntu 11.04
I tried to add QT versions in QT-Creator/Build/QT-versions configuration and it asked for a qmake executable.
I installed it using:
sudo apt-get install qt4-devel

which deployed qmake in /usr/bin/qmake
I selected it in QT-Creator/Build/QT-versions configuration as manual, Qt-4.7.2 (System) /usr/bin/qmake-qt4 but QT version is not properly installed, please run make install message appears and I can't use it in QT-Creator/Build/Kits configuration.
How can I solve the problem and configure qmake for Qt-creator use in project creation?

A:

This solved the problem for me on recent Ubuntu version:
sudo apt-get install qt5-default

A:

Just so this no longer shows up as unanswered:
To install all qt-devel libraries, use
sudo apt-get install qt4-dev-tools libqt4-dev libqt4-core libqt4-gui

