QMake doesn't work properly
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--> qmake -v to get the qmake version and maybe qmake -d <foo>.pro to see what exactly happens. 
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Hi, Just an educated guess but check the qmake version. It's possible that you are currently using a Qt 4 qmake. @SGaist By running the command qmake -vI get this QMake version 3.1 Using Qt version 5.12.8 in /usr/lib/x86_64-linux-gnu@Christian-Ehrlicher By running the command qmake -d <foo>I get this bash: syntax error near unexpected token `newline'
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That looks good. What do you get if you just call "qmake project.pro" without any other parameters ? 
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That looks good. What do you get if you just call "qmake project.pro" without any other parameters ? 
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@SGaist By running the command qmake -vI get this QMake version 3.1 Using Qt version 5.12.8 in /usr/lib/x86_64-linux-gnu@Christian-Ehrlicher By running the command qmake -d <foo>I get this bash: syntax error near unexpected token `newline'@Johnnyk91 said in QMake doesn't work properly: qmake -d <foo> I get this 
 bash: syntax error near unexpected token `newline'You did not really put 'qmake -d <foo>' into your command line and wondered that it did not work? Do you??? 
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@Johnnyk91 said in QMake doesn't work properly: qmake -d <foo> I get this 
 bash: syntax error near unexpected token `newline'You did not really put 'qmake -d <foo>' into your command line and wondered that it did not work? Do you??? @Christian-Ehrlicher I don't know what you mean but I tried qmake -dand I got a lot of lines starting with DEBUG 1 
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@jsulm Hi I've just checked with sudo dpkg --listand it is installed. I've also found the directory with the Qt Headers QApplication, QObject, etc... @Johnnyk91 said in QMake doesn't work properly: and it is installed. 
 I've also found the directory with the Qt Headers QApplication, QObject, etc...Make sure the development packages are installed, that is qtbase5-devandqtbase5-dev-tools.
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@Johnnyk91 said in QMake doesn't work properly: and it is installed. 
 I've also found the directory with the Qt Headers QApplication, QObject, etc...Make sure the development packages are installed, that is qtbase5-devandqtbase5-dev-tools.@kshegunov Thank you for your suggestion. I turned off my computer. I'll check tomorrow and come back to you. 
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@Johnnyk91 said in QMake doesn't work properly: and it is installed. 
 I've also found the directory with the Qt Headers QApplication, QObject, etc...Make sure the development packages are installed, that is qtbase5-devandqtbase5-dev-tools.@kshegunov I've just checked and they were already installed. All the packages related to qt on my computer are ii libqt5concurrent5:amd64 5.12.8+dfsg-0ubuntu1 amd64 Qt 5 concurrent module ii libqt5core5a:amd64 5.12.8+dfsg-0ubuntu1 amd64 Qt 5 core module ii libqt5dbus5:amd64 5.12.8+dfsg-0ubuntu1 amd64 Qt 5 D-Bus module ii libqt5gui5:amd64 5.12.8+dfsg-0ubuntu1 amd64 Qt 5 GUI module ii libqt5network5:amd64 5.12.8+dfsg-0ubuntu1 amd64 Qt 5 network module ii libqt5opengl5:amd64 5.12.8+dfsg-0ubuntu1 amd64 Qt 5 OpenGL module ii libqt5opengl5-dev:amd64 5.12.8+dfsg-0ubuntu1 amd64 Qt 5 OpenGL library development files ii libqt5printsupport5:amd64 5.12.8+dfsg-0ubuntu1 amd64 Qt 5 print support module ii libqt5sql5:amd64 5.12.8+dfsg-0ubuntu1 amd64 Qt 5 SQL module ii libqt5sql5-sqlite:amd64 5.12.8+dfsg-0ubuntu1 amd64 Qt 5 SQLite 3 database driver ii libqt5svg5:amd64 5.12.8-0ubuntu1 amd64 Qt 5 SVG module ii libqt5test5:amd64 5.12.8+dfsg-0ubuntu1 amd64 Qt 5 test module ii libqt5widgets5:amd64 5.12.8+dfsg-0ubuntu1 amd64 Qt 5 widgets module ii libqt5xml5:amd64 5.12.8+dfsg-0ubuntu1 amd64 Qt 5 XML module ii libqwt-qt5-6 6.1.4-1.1build1 amd64 Qt widgets library for technical applications (runtime, qt5) ii qt5-default:amd64 5.12.8+dfsg-0ubuntu1 amd64 Qt 5 development defaults package ii qt5-gtk-platformtheme:amd64 5.12.8+dfsg-0ubuntu1 amd64 Qt 5 GTK+ 3 platform theme ii qt5-qmake:amd64 5.12.8+dfsg-0ubuntu1 amd64 Qt 5 qmake Makefile generator tool ii qt5-qmake-bin 5.12.8+dfsg-0ubuntu1 amd64 Qt 5 qmake Makefile generator tool — binary file ii qtbase5-dev:amd64 5.12.8+dfsg-0ubuntu1 amd64 Qt 5 base development files ii qtbase5-dev-tools 5.12.8+dfsg-0ubuntu1 amd64 Qt 5 base development programs ii qtchooser 66-2build1 amd64 Wrapper to select between Qt development binary versions ii qttranslations5-l10n 5.12.8-0ubuntu1 all translations for Qt 5
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@kshegunov I've just checked and they were already installed. All the packages related to qt on my computer are ii libqt5concurrent5:amd64 5.12.8+dfsg-0ubuntu1 amd64 Qt 5 concurrent module ii libqt5core5a:amd64 5.12.8+dfsg-0ubuntu1 amd64 Qt 5 core module ii libqt5dbus5:amd64 5.12.8+dfsg-0ubuntu1 amd64 Qt 5 D-Bus module ii libqt5gui5:amd64 5.12.8+dfsg-0ubuntu1 amd64 Qt 5 GUI module ii libqt5network5:amd64 5.12.8+dfsg-0ubuntu1 amd64 Qt 5 network module ii libqt5opengl5:amd64 5.12.8+dfsg-0ubuntu1 amd64 Qt 5 OpenGL module ii libqt5opengl5-dev:amd64 5.12.8+dfsg-0ubuntu1 amd64 Qt 5 OpenGL library development files ii libqt5printsupport5:amd64 5.12.8+dfsg-0ubuntu1 amd64 Qt 5 print support module ii libqt5sql5:amd64 5.12.8+dfsg-0ubuntu1 amd64 Qt 5 SQL module ii libqt5sql5-sqlite:amd64 5.12.8+dfsg-0ubuntu1 amd64 Qt 5 SQLite 3 database driver ii libqt5svg5:amd64 5.12.8-0ubuntu1 amd64 Qt 5 SVG module ii libqt5test5:amd64 5.12.8+dfsg-0ubuntu1 amd64 Qt 5 test module ii libqt5widgets5:amd64 5.12.8+dfsg-0ubuntu1 amd64 Qt 5 widgets module ii libqt5xml5:amd64 5.12.8+dfsg-0ubuntu1 amd64 Qt 5 XML module ii libqwt-qt5-6 6.1.4-1.1build1 amd64 Qt widgets library for technical applications (runtime, qt5) ii qt5-default:amd64 5.12.8+dfsg-0ubuntu1 amd64 Qt 5 development defaults package ii qt5-gtk-platformtheme:amd64 5.12.8+dfsg-0ubuntu1 amd64 Qt 5 GTK+ 3 platform theme ii qt5-qmake:amd64 5.12.8+dfsg-0ubuntu1 amd64 Qt 5 qmake Makefile generator tool ii qt5-qmake-bin 5.12.8+dfsg-0ubuntu1 amd64 Qt 5 qmake Makefile generator tool — binary file ii qtbase5-dev:amd64 5.12.8+dfsg-0ubuntu1 amd64 Qt 5 base development files ii qtbase5-dev-tools 5.12.8+dfsg-0ubuntu1 amd64 Qt 5 base development programs ii qtchooser 66-2build1 amd64 Wrapper to select between Qt development binary versions ii qttranslations5-l10n 5.12.8-0ubuntu1 all translations for Qt 5@Johnnyk91 said in QMake doesn't work properly: All the packages related to qt on my computer are You have installed the runtime packages. As @kshegunov said, you must also install the development packages. 
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@Johnnyk91 said in QMake doesn't work properly: All the packages related to qt on my computer are You have installed the runtime packages. As @kshegunov said, you must also install the development packages. 
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@Johnnyk91 said in QMake doesn't work properly: @JKSH Are the development packages qtbase5-dev and qtbase5-dev-tools ? Ah, sorry... I just noticed that you do have qtbase5-dev and qtbase5-dev-tools installed. OK, you already have the development packages. Next thing to try: Install Qt Creator and see if you can use it to build an application. 
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If you did something like CONFIG = debugYou, in fact, nuked the content of the variable and replaced it with debug. If you want to modify the content of such a variable, use either += or *=. The first to add a value and the second to add the value only if not already in the variable. 
 
