QMake doesn't work properly

Johnnyk91

HI

I am on Ubuntu 20.04 LTS and I've just installed Qt through the command :

sudo apt install qt5-default

but QMake doesn't seem to work properly.

Even when I add QT += widgets in the project file (.pro), the compilation with Make fails because it can't find QApplication.

I generated the makefile with the command

qmake project.pro -o Makefile

and I get a makefile which the variable INCPATH is only set to

INCPATH       = -I. -I/usr/lib/x86_64-linux-gnu/qt5/mkspecs/linux-g++

Anybody knows how to fix this properly ?

Cordially

Johnnyk91

I've managed to fix it.

I set the variable CONFIG to debug in my project file and I think that's why the modules weren't added.
I took this line off and I was able to compile and run my program.

Thank you for trying to help me

jsulm

@Johnnyk91 Is libqt5widgets5 package also installed?

Johnnyk91

@jsulm Hi

I've just checked with

sudo dpkg --list

and it is installed.

I've also found the directory with the Qt Headers QApplication, QObject, etc...

SGaist

Hi,

Just an educated guess but check the qmake version. It's possible that you are currently using a Qt 4 qmake.

Christian Ehrlicher

--> qmake -v to get the qmake version

and maybe qmake -d <foo>.pro to see what exactly happens.

Johnnyk91

@SGaist By running the command

qmake -v

I 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'

SGaist

That looks good.

What do you get if you just call "qmake project.pro" without any other parameters ?

Johnnyk91

@SGaist The terminal doesn't display any message.
The Makefile generated is the same.

Christian Ehrlicher

@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???

Johnnyk91

@Christian-Ehrlicher I don't know what you mean but I tried

qmake -d

and I got a lot of lines starting with DEBUG 1

kshegunov

@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-dev and qtbase5-dev-tools.

Johnnyk91

@kshegunov Thank you for your suggestion. I turned off my computer. I'll check tomorrow and come back to you.

Johnnyk91

@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

JKSH

@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.

Johnnyk91

@JKSH Are the development packages qtbase5-dev and qtbase5-dev-tools ?

JKSH

@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.

Johnnyk91

I've managed to fix it.

I set the variable CONFIG to debug in my project file and I think that's why the modules weren't added.
I took this line off and I was able to compile and run my program.

Thank you for trying to help me

SGaist

If you did something like

CONFIG = debug

You, 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.