<![CDATA[Missing KCoreAddons and KWidgetsAddons developing in Kubuntu 24.04 LTS]]>Good morning to all,
I develop under Kubuntu, as you can view in the attached image. I'm trying to compile an existing project, downloaded from GitHub. The .pro file contains that line:

QT += xml svg network sql widgets printsupport concurrent KWidgetsAddons KCoreAddons

When I try to compile, I receive the following message:

09:29:33: Running steps for project qelectrotech...
09:29:33: Starting: "/home/glafauci61/Qt/5.15.1/gcc_64/bin/qmake" /media/LinuxDati/Programmi-QT/QElectroTech/qelectrotech-source-mirror-master/qelectrotech.pro -spec linux-g++ CONFIG+=debug CONFIG+=qml_debug
Project ERROR: Unknown module(s) in QT: KWidgetsAddons KCoreAddons
09:29:33: The command "/home/glafauci61/Qt/5.15.1/gcc_64/bin/qmake /media/LinuxDati/Programmi-QT/QElectroTech/qelectrotech-source-mirror-master/qelectrotech.pro -spec linux-g++ CONFIG+=debug CONFIG+=qml_debug" terminated with exit code 3.
09:29:33: Error while building/deploying project qelectrotech (kit: Desktop Qt 5.15.1 GCC 64bit)
09:29:33: When executing step "qmake"
09:29:33: Elapsed time: 00:00.

I can't understand what's the problem: both KCoreAddons and KWidgetsAddons libraries are set in the system, under the directory /usr/lib/x86_64-linux-gnu.

Anyone can help me?

Screenshot_20260128_105920.png

]]>https://forum.qt.io/topic/164169/missing-kcoreaddons-and-kwidgetsaddons-developing-in-kubuntu-24.04-ltsRSS for NodeSun, 26 Apr 2026 09:54:12 GMTWed, 28 Jan 2026 10:07:40 GMT60<![CDATA[Reply to Missing KCoreAddons and KWidgetsAddons developing in Kubuntu 24.04 LTS on Tue, 03 Feb 2026 08:49:42 GMT]]>@SGaist, thank you. I saw these packages, and I downloaded them.
They were essentials to solve my problem.

Pls, quote me, so I can post without limitations. Thank you.
Bye.

]]>https://forum.qt.io/post/835975https://forum.qt.io/post/835975Tue, 03 Feb 2026 08:49:42 GMT<![CDATA[Reply to Missing KCoreAddons and KWidgetsAddons developing in Kubuntu 24.04 LTS on Tue, 03 Feb 2026 07:59:53 GMT]]>@gfa.lafauci a quick search on https://packages.debian.org returns:

  • libkf5coreaddons-dev
  • libkf5widgetsaddons-dev
]]>https://forum.qt.io/post/835973https://forum.qt.io/post/835973Tue, 03 Feb 2026 07:59:53 GMT<![CDATA[Reply to Missing KCoreAddons and KWidgetsAddons developing in Kubuntu 24.04 LTS on Tue, 03 Feb 2026 07:59:30 GMT]]>I resolved the problem modifying the following statement in .pro files:

QT += xml svg network sql widgets printsupport concurrent #KWidgetsAddons KCoreAddons

Next, I add one new section:

# using KCoreAddons and KWidgetsAddons
unix {
  INCLUDEPATH += /usr/include/KF5/KCoreAddons

  LIBS += /usr/lib/x86_64-linux-gnu/libKF5CoreAddons.so \
          /usr/lib/x86_64-linux-gnu/libKF5WidgetsAddons.so
}

With these modifications, the project compiles and links correctly.

]]>https://forum.qt.io/post/835972https://forum.qt.io/post/835972Tue, 03 Feb 2026 07:59:30 GMT<![CDATA[Reply to Missing KCoreAddons and KWidgetsAddons developing in Kubuntu 24.04 LTS on Tue, 03 Feb 2026 06:37:26 GMT]]>@gfa.lafauci By using qmake provided by Qt installed from Kubuntu packages.

]]>https://forum.qt.io/post/835971https://forum.qt.io/post/835971Tue, 03 Feb 2026 06:37:26 GMT<![CDATA[Reply to Missing KCoreAddons and KWidgetsAddons developing in Kubuntu 24.04 LTS on Tue, 03 Feb 2026 06:27:20 GMT]]>@jsulm, how?

]]>https://forum.qt.io/post/835970https://forum.qt.io/post/835970Tue, 03 Feb 2026 06:27:20 GMT<![CDATA[Reply to Missing KCoreAddons and KWidgetsAddons developing in Kubuntu 24.04 LTS on Tue, 03 Feb 2026 06:16:37 GMT]]>@SGaist, I try to install KCoreAddons-dev and KWidgetsAddons-dev via apt, but I receive the message "the package is not available" (or similar). I searched for them on my system and both are stored in '/usr/lib/x86_64-linux-gnu' directory. I inserted that path in the .pro file, but never change. I know that both two packages are essential for Kubuntu, and I don't understand why QT6 can't reach them.

]]>https://forum.qt.io/post/835969https://forum.qt.io/post/835969Tue, 03 Feb 2026 06:16:37 GMT<![CDATA[Reply to Missing KCoreAddons and KWidgetsAddons developing in Kubuntu 24.04 LTS on Wed, 28 Jan 2026 22:12:09 GMT]]>@gfa.lafauci Hi and welcome to devnet,

Did you also install the development packages for these two libraries ?

]]>https://forum.qt.io/post/835809https://forum.qt.io/post/835809Wed, 28 Jan 2026 22:12:09 GMT<![CDATA[Reply to Missing KCoreAddons and KWidgetsAddons developing in Kubuntu 24.04 LTS on Wed, 28 Jan 2026 13:07:16 GMT]]>@gfa.lafauci said in Missing KCoreAddons and KWidgetsAddons developing in Kubuntu 24.04 LTS:

can't understand what's the problem

I guess the problem is that you're using Qt installed via Qt Online Installer. Try to use Qt provided by Kubuntu.

]]>https://forum.qt.io/post/835795https://forum.qt.io/post/835795Wed, 28 Jan 2026 13:07:16 GMT