Qmake: could not find a Qt installation of ''
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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
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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
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$HOME/Qt/5.3/gcc/bin/qmake
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I installed Qt 5 from the run online installer file .