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I wrote a little program in C++ using Qt. Back when it was Qt4, in order for my friends to compile my program on their Ubuntu system, I would tell them, after getting my source files, to just run:

sudo apt install libqt4-dev
<navigate to sources directory>
qmake
make

Now that it is Qt5, I read somewhere that the new libqt4-dev is qtdeclarative5-dev so I told them to just type the code above with qtdeclarative5-dev instead of libqt4-dev. However qmake didn't work, it did: qmake: could not exec '/usr/lib/x86_64-linux-gnu/qt4/bin/qmake': No such file or directory. I quickly found a fix by appending -qt5:

sudo apt install qtdeclarative5-dev
<navigate to sources directory>
qmake -qt5
make

Is this the correct way to do this? Is there a lighter or quicker Qt install?

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+100

Correct way to compile using only qmake command. You can install qt5-default package to set qt5 as default while using development binaries.

sudo apt-get install qt5-default qtdeclarative5-dev
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  • "Your program was written in qt4 so it was searching qt4 binaries in system": Actually no, I have obtained the same error with another program written in Qt5. I don't know why it tried to compile with qt4. – Seub Dec 1 '18 at 17:35

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