Qmake: could not find a Qt installation of ''

[bloodviper9000]

For a software I have in ubuntu, I have to run qmake to generate the Makefile.

However, running qmake gives back this error,

qmake: could not find a Qt installation of ''

How to solve it

[andreyc]

Looks like you calling qmake from wrong path.
If you have installed Qt from Ubuntu repository then check that you calling correct version of qmake. I think qmake has different prefix for Qt4 and Qt5.
If you trying to use Qt from qt-project.org then try to run qmake with full path
@
$HOME/Qt/5.3/gcc/bin/qmake
@

[bloodviper9000]

I installed Qt 5 from the run online installer file .

[andreyc]

Try to run qmake with full path from Qt installation.