how to fix linker error in eclipse on linux

[micha_eleric]

@jsulm how i install qt4?
i did internet search for "sudo install qt4". i just redid search, but only came up with install qt5, however the numbers dont look the same.

under /usr/lib:
python3.9
qt5
recovery-mode

under usr/lib64:
ld-linux-x86-64.so.2

under /usr/include:
python3.8
qt4
rdma

[jsulm]

@micha_eleric said in how to fix linker error in eclipse on linux:

under /usr/lib:
python3.9
qt5
recovery-mode
under usr/lib64:
ld-linux-x86-64.so.2

There should be way more than that.
I suggested to search:

find /usr/lib -name *qt4*
find /usr/lib64 -name *qt4*

What Linux distribution do you use? Please also tell the version.

[micha_eleric]

@jsulm there is a lot more, i only listed what was before and after qt

looking back through command line, i wonder if i half installed

[micha_eleric]

@jsulm from https://ubuntuhandbook.org/index.php/2020/07/install-qt4-ubuntu-20-04/

i have:
sudo add-apt-repository ppa:rock-core/qt4
in command line.

??anything else should be installed?

[jsulm]

@micha_eleric said in how to fix linker error in eclipse on linux:

sudo add-apt-repository ppa:rock-core/qt4

This does not install anything!
This command only adds a new source for packages.
You need to install needed packages using "apt install PACKET_NAME".

One question: do you really need Qt4?

[micha_eleric]

@jsulm qt4 it is what i started with.

i also found:
sudo apt install qt4-dev-tools libqt4-dev libqt4-core libqt4-gui

which seems to be from:
https://askubuntu.com/questions/1274134/cannot-install-qt-4-on-ubuntu-20-04-quite-universal-circuit-simulator-qucs

this is last i found with qt*, if it is not installing qt4, then i guess my errors have been found

sudo apt-get install qt5-default
results:
qt5-default is already the newest version (5.12.8+dfsg-0ubuntu2.1).

however, there are no qt5 directory under /usr/include

[JonB]

@micha_eleric said in how to fix linker error in eclipse on linux:

@jsulm qt4 it is what i started with.

This is not a great/clear answer, as @jsulm is pointing out that Qt4 is very old. Do you have a choice to move to Qt5, or even (hesitantly!) Qt6?

[micha_eleric]

@JonB it seems i already installed qt5. just it is not showing up under /usr/include

[jsulm]

@micha_eleric said in how to fix linker error in eclipse on linux:

i already installed qt5

What exactly? Which qt5 packages?
" just it is not showing up under /usr/include" - as I already told you b efore the libraries will NOT show up in that directory. Search for the qt5 libs like I suggested before:

find /usr/lib -name *qt5*
find /usr/lib64 -name *qt5*

Don't forget to also change include folders in your set-up as currently you use qt4 include folder.

[micha_eleric]

@jsulm said in how to fix linker error in eclipse on linux:

find /usr/lib -name qt5

michaeleric@michaeleric-C7B250-CB-ML:/usr/lib$ find -name qt5
./qt5
./x86_64-linux-gnu/qt5
michaeleric@michaeleric-C7B250-CB-ML:/usr/lib$ cd /
michaeleric@michaeleric-C7B250-CB-ML:/$ cd /usr/lib64
michaeleric@michaeleric-C7B250-CB-ML:/usr/lib64$ find -name qt5
michaeleric@michaeleric-C7B250-CB-ML:/usr/lib64$

[jsulm]

@micha_eleric Please read again what I suggested (hint: * is important)...

[micha_eleric]

@jsulm the * was used, copied, pasted, but did not show on post.

[jsulm]

@micha_eleric Can you please answer questions?
I asked before: What exactly? Which qt5 packages?

[micha_eleric]

@jsulm sudo apt-get install qt5-default
from:
https://wiki.qt.io/Install_Qt_5_on_Ubuntu

[jsulm]

@micha_eleric On my Ubuntu machine Qt5 libs are in /lib/x86_64-linux-gnu
Like /lib/x86_64-linux-gnu/libQt5Widgets.so.5

[JonB]

@micha_eleric said in how to fix linker error in eclipse on linux:

@jsulm the * was used, copied, pasted, but did not show on post.

find /usr/lib -name *qt5*
find /usr/lib64 -name *qt5*

You must quote these from the shell's expansion:

find /usr/lib -name '*Qt5*'
find /usr/lib64 -name '*Qt5*'

Or you might find this useful:

locate Qt5

[jsulm]

@JonB It is Qt not qt in lib names, so was my mistake

[JonB]

@jsulm
I have edited my response to use Qt5. But the quoting is still necessary!? https://man7.org/linux/man-pages/man1/find.1.html :

The filename matching is performed
with the use of the fnmatch(3) library function. Don't
forget to enclose the pattern in quotes in order to
protect it from expansion by the shell.

[micha_eleric]

@jsulm michaeleric@michaeleric-C7B250-CB-ML:~$ find /usr/lib -name *Qt5 *
/usr/lib/python3/dist-packages/PyQt5
/usr/lib/python3/dist-packages/PyQt5-5.14.1.dist-info
/usr/lib/x86_64-linux-gnu/libQt5GlxSupport.a
/usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
/usr/lib/x86_64-linux-gnu/libQt5MultimediaQuick.so.5.12
/usr/lib/x86_64-linux-gnu/libQt5LinuxAccessibilitySupport.a
/usr/lib/x86_64-linux-gnu/libQt5SerialPort.so.5.12.8
/usr/lib/x86_64-linux-gnu/libQt5SerialPort.so.5
/usr/lib/x86_64-linux-gnu/libQt5ThemeSupport.a
/usr/lib/x86_64-linux-gnu/libQt5MultimediaQuick.so.5.12.8
/usr/lib/x86_64-linux-gnu/libQt5XmlPatterns.so.5.12
/usr/lib/x86_64-linux-gnu/libQt5AccessibilitySupport.a
/usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5.12.8
/usr/lib/x86_64-linux-gnu/libQt5Designer.so.5
/usr/lib/x86_64-linux-gnu/libQt5Positioning.so.5.12
/usr/lib/x86_64-linux-gnu/libQt5Svg.so.5.12.8
/usr/lib/x86_64-linux-gnu/libQt5Positioning.so.5.12.8
/usr/lib/x86_64-linux-gnu/libQt5WebChannel.so.5.12.8
/usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
/usr/lib/x86_64-linux-gnu/libQt5WebKitWidgets.so.5
/usr/lib/x86_64-linux-gnu/libQt5QuickTemplates2.so.5
/usr/lib/x86_64-linux-gnu/libQt5Test.so.5.12.8
/usr/lib/x86_64-linux-gnu/libQt5PrintSupport.prl
/usr/lib/x86_64-linux-gnu/libQt5EdidSupport.prl
/usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5.12
/usr/lib/x86_64-linux-gnu/libQt5Widgets.so
/usr/lib/x86_64-linux-gnu/libQt5PlatformCompositorSupport.prl
/usr/lib/x86_64-linux-gnu/libQt5SerialPort.so
/usr/lib/x86_64-linux-gnu/libQt5Network.so
/usr/lib/x86_64-linux-gnu/libQt5Xml.so
/usr/lib/x86_64-linux-gnu/libQt5EglFsKmsSupport.so.5
/usr/lib/x86_64-linux-gnu/libQt5VulkanSupport.a
/usr/lib/x86_64-linux-gnu/libQt5Test.so.5.12
/usr/lib/x86_64-linux-gnu/libQt5ThemeSupport.prl
/usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
/usr/lib/x86_64-linux-gnu/libQt5MultimediaWidgets.so.5
/usr/lib/x86_64-linux-gnu/libQt5InputSupport.a
/usr/lib/x86_64-linux-gnu/libQt5GlxSupport.prl
/usr/lib/x86_64-linux-gnu/libQt5Positioning.so.5
/usr/lib/x86_64-linux-gnu/libQt5VulkanSupport.prl
/usr/lib/x86_64-linux-gnu/libQt5X11Extras.so.5.12.8
/usr/lib/x86_64-linux-gnu/libQt5SerialPort.so.5.12
/usr/lib/x86_64-linux-gnu/libQt5Script.so.5
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/features/data/cmake/Qt5PluginTarget.cmake.in
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/features/data/cmake/Qt5BasicConfig.cmake.in
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/features/data/cmake/Qt5ConfigVersion.cmake.in
/usr/lib/x86_64-linux-gnu/libQt5WaylandCompositor.so.5.12.8
/usr/lib/x86_64-linux-gnu/libQt5OpenGL.so.5.12.8
/usr/lib/x86_64-linux-gnu/libQt5KmsSupport.prl
/usr/lib/x86_64-linux-gnu/libQt5WaylandCompositor.so.5
/usr/lib/x86_64-linux-gnu/libQt5WebEngine.so.5
/usr/lib/x86_64-linux-gnu/libQt5EventDispatcherSupport.a
/usr/lib/x86_64-linux-gnu/libQt5Script.so.5.12.8
/usr/lib/x86_64-linux-gnu/libQt5Test.prl
/usr/lib/x86_64-linux-gnu/libQt5DBus.so.5.12.8
/usr/lib/x86_64-linux-gnu/cmake/Qt5TextToSpeech
/usr/lib/x86_64-linux-gnu/cmake/Qt5TextToSpeech/Qt5TextToSpeech_QTextToSpeechEngineFlite.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5OpenGL
/usr/lib/x86_64-linux-gnu/cmake/Qt5OpenGL/Qt5OpenGLConfig.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5OpenGL/Qt5OpenGLConfigVersion.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5PrintSupport
/usr/lib/x86_64-linux-gnu/cmake/Qt5PrintSupport/Qt5PrintSupportConfigVersion.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5PrintSupport/Qt5PrintSupport_QCupsPrinterSupportPlugin.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5PrintSupport/Qt5PrintSupportConfig.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Sql
/usr/lib/x86_64-linux-gnu/cmake/Qt5Sql/Qt5SqlConfig.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Sql/Qt5SqlConfigVersion.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5OpenGLExtensions
/usr/lib/x86_64-linux-gnu/cmake/Qt5OpenGLExtensions/Qt5OpenGLExtensionsConfigVersion.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5OpenGLExtensions/Qt5OpenGLExtensionsConfig.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Gui
/usr/lib/x86_64-linux-gnu/cmake/Qt5Gui/Qt5Gui_QEvdevMousePlugin.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Gui/Qt5Gui_QTuioTouchPlugin.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Gui/Qt5Gui_QEvdevKeyboardPlugin.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Gui/Qt5Gui_QXcbIntegrationPlugin.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Gui/Qt5Gui_QEglFSKmsGbmIntegrationPlugin.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Gui/Qt5GuiConfigExtras.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Gui/Qt5GuiConfigVersion.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Gui/Qt5Gui_QXcbEglIntegrationPlugin.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Gui/Qt5Gui_QEglFSKmsEglDeviceIntegrationPlugin.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Gui/Qt5Gui_QComposePlatformInputContextPlugin.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Gui/Qt5Gui_QIbusPlatformInputContextPlugin.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Gui/Qt5Gui_QVncIntegrationPlugin.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Gui/Qt5Gui_QEvdevTouchScreenPlugin.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Gui/Qt5Gui_QXcbGlxIntegrationPlugin.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Gui/Qt5Gui_QEvdevTabletPlugin.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Gui/Qt5Gui_QEglFSX11IntegrationPlugin.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Gui/Qt5Gui_QEglFSEmulatorIntegrationPlugin.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Gui/Qt5Gui_QGifPlugin.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Gui/Qt5Gui_QEglFSIntegrationPlugin.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Gui/Qt5Gui_QMinimalIntegrationPlugin.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Gui/Qt5Gui_QOffscreenIntegrationPlugin.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Gui/Qt5Gui_QICOPlugin.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Gui/Qt5Gui_QMinimalEglIntegrationPlugin.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Gui/Qt5Gui_QLinuxFbIntegrationPlugin.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Gui/Qt5Gui_QLibInputPlugin.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Gui/Qt5Gui_QJpegPlugin.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Gui/Qt5GuiConfig.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5SerialPort
/usr/lib/x86_64-linux-gnu/cmake/Qt5SerialPort/Qt5SerialPortConfig.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5SerialPort/Qt5SerialPortConfigVersion.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Network
/usr/lib/x86_64-linux-gnu/cmake/Qt5Network/Qt5Network_QGenericEnginePlugin.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Network/Qt5NetworkConfig.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Network/Qt5Network_QNetworkManagerEnginePlugin.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Network/Qt5Network_QConnmanEnginePlugin.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Network/Qt5NetworkConfigVersion.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Core
/usr/lib/x86_64-linux-gnu/cmake/Qt5Core/Qt5CTestMacros.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Core/Qt5CoreConfig.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Core/Qt5CoreMacros.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Core/Qt5CoreConfigExtrasMkspecDir.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Core/Qt5CoreConfigVersion.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Core/Qt5CoreConfigExtras.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Widgets
/usr/lib/x86_64-linux-gnu/cmake/Qt5Widgets/Qt5WidgetsMacros.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Widgets/Qt5WidgetsConfigVersion.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Widgets/Qt5WidgetsConfigExtras.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Widgets/Qt5WidgetsConfig.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Test
/usr/lib/x86_64-linux-gnu/cmake/Qt5Test/Qt5TestConfigVersion.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Test/Qt5TestConfigExtras.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Test/Qt5TestConfig.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Concurrent
/usr/lib/x86_64-linux-gnu/cmake/Qt5Concurrent/Qt5ConcurrentConfigVersion.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Concurrent/Qt5ConcurrentConfig.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5DBus
/usr/lib/x86_64-linux-gnu/cmake/Qt5DBus/Qt5DBusConfig.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5DBus/Qt5DBusConfigVersion.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5DBus/Qt5DBusMacros.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5DBus/Qt5DBusConfigExtras.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Xml
/usr/lib/x86_64-linux-gnu/cmake/Qt5Xml/Qt5XmlConfig.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Xml/Qt5XmlConfigVersion.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5
/usr/lib/x86_64-linux-gnu/cmake/Qt5/Qt5ConfigVersion.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5/Qt5ModuleLocation.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5/Qt5Config.cmake
/usr/lib/x86_64-linux-gnu/pkgconfig/Qt5Xml.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/Qt5Widgets.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/Qt5Test.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/Qt5Sql.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/Qt5Core.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/Qt5SerialPort.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/Qt5Concurrent.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/Qt5Gui.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/Qt5Network.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/Qt5DBus.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/Qt5PrintSupport.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/Qt5OpenGLExtensions.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/Qt5OpenGL.pc
/usr/lib/x86_64-linux-gnu/libQt5EglFSDeviceIntegration.so.5.12.8
/usr/lib/x86_64-linux-gnu/libQt5Xml.so.5
/usr/lib/x86_64-linux-gnu/libQt5MultimediaGstTools.so.5.12.8
/usr/lib/x86_64-linux-gnu/libQt5PrintSupport.so.5.12
/usr/lib/x86_64-linux-gnu/libQt5WebEngineWidgets.so.5.12
/usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5.12
/usr/lib/x86_64-linux-gnu/libQt5HunspellInputMethod.so.5
/usr/lib/x86_64-linux-gnu/libQt5Svg.so.5
/usr/lib/x86_64-linux-gnu/libQt5MultimediaGstTools.so.5
/usr/lib/x86_64-linux-gnu/libQt5EglFSDeviceIntegration.so.5
/usr/lib/x86_64-linux-gnu/libQt5Gui.prl
/usr/lib/x86_64-linux-gnu/libQt5QuickWidgets.so.5.12
/usr/lib/x86_64-linux-gnu/libQt5DeviceDiscoverySupport.prl
/usr/lib/x86_64-linux-gnu/libQt5Sql.so.5.12
/usr/lib/x86_64-linux-gnu/libQt5Concurrent.so.5
/usr/lib/x86_64-linux-gnu/libQt5EventDispatcherSupport.prl
/usr/lib/x86_64-linux-gnu/libQt5Help.so.5.12
/usr/lib/x86_64-linux-gnu/libQt5Network.so.5.12.8
/usr/lib/x86_64-linux-gnu/libQt5Qml.so.5.12.8
/usr/lib/x86_64-linux-gnu/libQt5Multimedia.so.5.12
/usr/lib/x86_64-linux-gnu/libQt5Sql.so.5
/usr/lib/x86_64-linux-gnu/libQt5OpenGL.so.5.12
/usr/lib/x86_64-linux-gnu/libQt5WebEngineWidgets.so.5.12.8
/usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so
/usr/lib/x86_64-linux-gnu/libQt5WebEngine.so.5.12
/usr/lib/x86_64-linux-gnu/libQt5Network.so.5
/usr/lib/x86_64-linux-gnu/libQt5QuickControls2.so.5.12
/usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
/usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
/usr/lib/x86_64-linux-gnu/libQt5QuickControls2.so.5.12.8
/usr/lib/x86_64-linux-gnu/libQt5XmlPatterns.so.5.12.8
/usr/lib/x86_64-linux-gnu/libQt5Xml.so.5.12
/usr/lib/x86_64-linux-gnu/libQt5EglSupport.a
/usr/lib/x86_64-linux-gnu/libQt5Concurrent.so
/usr/lib/x86_64-linux-gnu/libQt5DBus.prl
/usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5.12.8
/usr/lib/x86_64-linux-gnu/libQt5TextToSpeech.so.5
/usr/lib/x86_64-linux-gnu/libQt5Xml.prl
/usr/lib/x86_64-linux-gnu/libQt5AccessibilitySupport.prl
/usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5.12
/usr/lib/x86_64-linux-gnu/libQt5PlatformCompositorSupport.a
/usr/lib/x86_64-linux-gnu/libQt5WaylandCompositor.so.5.12
/usr/lib/x86_64-linux-gnu/libQt5Core.prl
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5.12.8
/usr/lib/x86_64-linux-gnu/libQt5FbSupport.prl
/usr/lib/x86_64-linux-gnu/libQt5Script.so.5.12
/usr/lib/x86_64-linux-gnu/libQt5Help.so.5.12.8
/usr/lib/x86_64-linux-gnu/libQt5ServiceSupport.a
/usr/lib/x86_64-linux-gnu/libQt5VirtualKeyboard.so.5
/usr/lib/x86_64-linux-gnu/libQt5Help.so.5
/usr/lib/x86_64-linux-gnu/libQt5OpenGL.prl
/usr/lib/x86_64-linux-gnu/libQt5Test.so
/usr/lib/x86_64-linux-gnu/libQt5PrintSupport.so.5.12.8
/usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5.12.8
/usr/lib/x86_64-linux-gnu/libQt5MultimediaGstTools.so.5.12
/usr/lib/x86_64-linux-gnu/libQt5WebEngineWidgets.so.5
/usr/lib/x86_64-linux-gnu/libQt5Designer.so.5.12
/usr/lib/x86_64-linux-gnu/libQt5WaylandClient.so.5.12
/usr/lib/x86_64-linux-gnu/libQt5DBus.so.5.12
/usr/lib/x86_64-linux-gnu/libQt5Network.so.5.12
/usr/lib/x86_64-linux-gnu/libQt5VirtualKeyboard.so.5.12.8
/usr/lib/x86_64-linux-gnu/libQt5Quick.so.5.12.8
/usr/lib/x86_64-linux-gnu/libQt5FontDatabaseSupport.a
/usr/lib/x86_64-linux-gnu/libQt5QuickTemplates2.so.5.12
/usr/lib/x86_64-linux-gnu/libQt5PrintSupport.so
/usr/lib/x86_64-linux-gnu/libQt5Sql.so.5.12.8
/usr/lib/x86_64-linux-gnu/libQt5QuickTemplates2.so.5.12.8
/usr/lib/x86_64-linux-gnu/libQt5EglFsKmsSupport.prl
/usr/lib/x86_64-linux-gnu/libQt5VirtualKeyboard.so.5.12
/usr/lib/x86_64-linux-gnu/libQt5Gui.so.5.12.8
/usr/lib/x86_64-linux-gnu/libQt5EglFsKmsSupport.so.5.12.8
/usr/lib/x86_64-linux-gnu/libQt5Network.prl
/usr/lib/x86_64-linux-gnu/libQt5WaylandClient.so.5.12.8
/usr/lib/x86_64-linux-gnu/libQt5QuickWidgets.so.5
/usr/lib/x86_64-linux-gnu/libQt5Quick.so.5.12
/usr/lib/x86_64-linux-gnu/libQt5WaylandClient.so.5
/usr/lib/x86_64-linux-gnu/libQt5HunspellInputMethod.so.5.12.8
/usr/lib/x86_64-linux-gnu/libQt5Gui.so
/usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
/usr/lib/x86_64-linux-gnu/libQt5HunspellInputMethod.so.5.12
/usr/lib/x86_64-linux-gnu/libQt5Sensors.so.5.12.8
/usr/lib/x86_64-linux-gnu/libQt5EglFSDeviceIntegration.so
/usr/lib/x86_64-linux-gnu/libQt5Xml.so.5.12.8
/usr/lib/x86_64-linux-gnu/libQt5Concurrent.so.5.12.8
/usr/lib/x86_64-linux-gnu/libQt5TextToSpeech.so.5.12.8
/usr/lib/x86_64-linux-gnu/libQt5WebEngine.so.5.12.8
/usr/lib/x86_64-linux-gnu/libQt5WebChannel.so.5
/usr/lib/x86_64-linux-gnu/libQt5EglFsKmsSupport.so.5.12
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5.12
/usr/lib/x86_64-linux-gnu/libQt5Concurrent.so.5.12
/usr/lib/x86_64-linux-gnu/libQt5Core.so
/usr/lib/x86_64-linux-gnu/libQt5MultimediaWidgets.so.5.12
/usr/lib/x86_64-linux-gnu/libQt5EglFsKmsSupport.so
/usr/lib/x86_64-linux-gnu/libQt5Sql.so
/usr/lib/x86_64-linux-gnu/libQt5EdidSupport.a
/usr/lib/x86_64-linux-gnu/libQt5DeviceDiscoverySupport.a
/usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5.212.0
/usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
/usr/lib/x86_64-linux-gnu/libQt5X11Extras.so.5.12
/usr/lib/x86_64-linux-gnu/libQt5QuickControls2.so.5
/usr/lib/x86_64-linux-gnu/libQt5InputSupport.prl
/usr/lib/x86_64-linux-gnu/libQt5MultimediaQuick.so.5
/usr/lib/x86_64-linux-gnu/libQt5Test.so.5
/usr/lib/x86_64-linux-gnu/libQt5FontDatabaseSupport.prl
/usr/lib/x86_64-linux-gnu/libQt5OpenGLExtensions.prl
/usr/lib/x86_64-linux-gnu/libQt5SerialPort.prl
/usr/lib/x86_64-linux-gnu/libQt5Sql.prl
/usr/lib/x86_64-linux-gnu/libQt5XmlPatterns.so.5
/usr/lib/x86_64-linux-gnu/libQt5Sensors.so.5.12
/usr/lib/x86_64-linux-gnu/libQt5MultimediaWidgets.so.5.12.8
/usr/lib/x86_64-linux-gnu/libQt5XcbQpa.prl
/usr/lib/x86_64-linux-gnu/libQt5WebChannel.so.5.12
/usr/lib/x86_64-linux-gnu/libQt5Svg.so.5.12
/usr/lib/x86_64-linux-gnu/libQt5Multimedia.so.5
/usr/lib/x86_64-linux-gnu/libQt5WebKitWidgets.so.5.212.0
/usr/lib/x86_64-linux-gnu/libQt5Qml.so.5.12
/usr/lib/x86_64-linux-gnu/libQt5Concurrent.prl
/usr/lib/x86_64-linux-gnu/libQt5Sensors.so.5
/usr/lib/x86_64-linux-gnu/libQt5FbSupport.a
/usr/lib/x86_64-linux-gnu/libQt5Designer.so.5.12.8
/usr/lib/x86_64-linux-gnu/libQt5EglFSDeviceIntegration.so.5.12
/usr/lib/x86_64-linux-gnu/libQt5ServiceSupport.prl
/usr/lib/x86_64-linux-gnu/libQt5OpenGLExtensions.a
/usr/lib/x86_64-linux-gnu/libQt5QuickWidgets.so.5.12.8
/usr/lib/x86_64-linux-gnu/libQt5Widgets.prl
/usr/lib/x86_64-linux-gnu/libQt5Multimedia.so.5.12.8
/usr/lib/x86_64-linux-gnu/libQt5LinuxAccessibilitySupport.prl
/usr/lib/x86_64-linux-gnu/libQt5X11Extras.so.5
/usr/lib/x86_64-linux-gnu/libQt5TextToSpeech.so.5.12
/usr/lib/x86_64-linux-gnu/libQt5DBus.so
/usr/lib/x86_64-linux-gnu/libQt5OpenGL.so
/usr/lib/x86_64-linux-gnu/libQt5WebEngineCore.so.5
/usr/lib/x86_64-linux-gnu/libQt5PrintSupport.so.5
/usr/lib/x86_64-linux-gnu/libQt5EglFSDeviceIntegration.prl
/usr/lib/x86_64-linux-gnu/libQt5KmsSupport.a
/usr/lib/x86_64-linux-gnu/libQt5OpenGL.so.5
/usr/lib/x86_64-linux-gnu/libQt5EglSupport.prl
/usr/lib/x86_64-linux-gnu/libQt5Gui.so.5.12
michaeleric@michaeleric-C7B250-CB-ML:~$

[jsulm]

@micha_eleric So, now you know in which folder the Qt libs are located