qt 5.15.2 everywhere - Could not find Qt5ThemeSupport

Fulgurance

Hi, I am Fulgurance and I am actually coding a package manager able to build all from sources. During some tests, I was building the plasma kde desktop environment, I almost finished to compile all packages. I just need to build now plasma-integration and plasma-desktop.

But when I started to compile plasma-integration, I had this error:

Could NOT find Qt5ThemeSupport

I built yet Qt, I think about a missing flag, but I feel it's very strange because normally qt by default is configured with the -gui support.
What flag maybe I missed ?

( I am following the LFS linux book 11.0)

This is my project: https://github.com/Fulgurance/ISM

This is the default flags I used:

--prefix (with the prefix I setted)
--sysconfdir
--confirm-license
--dbus-linked
--openssl-linked
-system-harfbuzz
-xcb
--nomake=examples
--no-rpath
--syslog
--skip=qtwebengine

JoeCFD

@Fulgurance on Linux use command to find it:
locate Qt5ThemeSupport

On Ubuntu 22.04 cmake file is located at
/usr/lib/x86_64-linux-gnu/cmake/Qt5ThemeSupport/
after you install it.

Fulgurance

@JoeCFD This is what I have:

root [ / ]# locate Qt5ThemeSupport
/opt/qt5/lib/cmake/Qt5ThemeSupport
/opt/qt5/lib/cmake/Qt5ThemeSupport/Qt5ThemeSupportConfig.cmake
/opt/qt5/lib/cmake/Qt5ThemeSupport/Qt5ThemeSupportConfigVersion.cmake
/opt/qt5/lib/libQt5ThemeSupport.a
/opt/qt5/lib/libQt5ThemeSupport.la
/opt/qt5/lib/libQt5ThemeSupport.prl
/sources/KdeSoftwares-Main/Plasma-Integration/5.22.4/v5.22.4/cmake/modules/FindQt5ThemeSupport.cmake

It's strange because it's installed...

This is the error I have:

>_ Checking Plasma-Integration
>_ Extracting Plasma-Integration
>_ Patching Plasma-Integration
>_ Preparing Plasma-Integration
>_ Configuring Plasma-Integration
-- The C compiler identification is GNU 11.2.0
-- The CXX compiler identification is GNU 11.2.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
Installing in /opt/kf5. Run /sources/KdeSoftwares-Main/Plasma-Integration/5.22.4/v5.22.4/build/prefix.sh to set the environment for PlasmaIntegration.
fatal: not a git repository (or any of the parent directories): .git
-- Looking for __GLIBC__
-- Looking for __GLIBC__ - found
-- Performing Test _OFFT_IS_64BIT
-- Performing Test _OFFT_IS_64BIT - Success
-- Performing Test HAVE_DATE_TIME
-- Performing Test HAVE_DATE_TIME - Success
-- Found KF5Config: /opt/kf5/lib/cmake/KF5Config/KF5ConfigConfig.cmake (found version "5.85.0") 
-- Found KF5ConfigWidgets: /opt/kf5/lib/cmake/KF5ConfigWidgets/KF5ConfigWidgetsConfig.cmake (found version "5.85.0") 
-- Found Gettext: /usr/bin/msgmerge (found version "0.21") 
-- Found KF5I18n: /opt/kf5/lib/cmake/KF5I18n/KF5I18nConfig.cmake (found version "5.85.0") 
-- Found KF5IconThemes: /opt/kf5/lib/cmake/KF5IconThemes/KF5IconThemesConfig.cmake (found version "5.85.0") 
-- Found KF5KIO: /opt/kf5/lib/cmake/KF5KIO/KF5KIOConfig.cmake (found version "5.85.0") 
-- Found KF5Notifications: /opt/kf5/lib/cmake/KF5Notifications/KF5NotificationsConfig.cmake (found version "5.85.0") 
-- Found KF5Wayland: /opt/kf5/lib/cmake/KF5Wayland/KF5WaylandConfig.cmake (found version "5.85.0") 
-- Found KF5WidgetsAddons: /opt/kf5/lib/cmake/KF5WidgetsAddons/KF5WidgetsAddonsConfig.cmake (found version "5.85.0") 
-- Found KF5WindowSystem: /opt/kf5/lib/cmake/KF5WindowSystem/KF5WindowSystemConfig.cmake (found version "5.85.0") 
-- Found KF5: success (found suitable version "5.85.0", minimum required is "5.82") found components: Config ConfigWidgets I18n IconThemes KIO Notifications Wayland WidgetsAddons WindowSystem ConfigWidgets 
-- Found XCB_XCB: /usr/lib/libxcb.so (found version "1.14") 
-- Found XCB: /usr/lib/libxcb.so (found version "1.14") found components: XCB 
-- Warning: Property URL already set to "https://xcb.freedesktop.org/", overriding it with "https://xcb.freedesktop.org"
-- Found PkgConfig: /usr/bin/pkg-config (found version "0.29.2") 
CMake Error at /usr/share/cmake-3.21/Modules/FindPackageHandleStandardArgs.cmake:230 (message):
  Could NOT find Qt5ThemeSupport (missing: Qt5ThemeSupport_LIBRARY
  Qt5ThemeSupport_INCLUDE_DIR) (found version "5.15.2")
Call Stack (most recent call first):
  /usr/share/cmake-3.21/Modules/FindPackageHandleStandardArgs.cmake:594 (_FPHSA_FAILURE_MESSAGE)
  cmake/modules/FindQt5ThemeSupport.cmake:90 (find_package_handle_standard_args)
  CMakeLists.txt:42 (find_package)


-- Configuring incomplete, errors occurred!
See also "/sources/KdeSoftwares-Main/Plasma-Integration/5.22.4/v5.22.4/build/CMakeFiles/CMakeOutput.log".
[!] Failed to run cmake -DCMAKE_INSTALL_PREFIX=/opt/kf5 -DCMAKE_BUILD_TYPE=Release -DBUILD_TESTING=OFF -Wno-dev .. in /sources/KdeSoftwares-Main/Plasma-Integration/5.22.4/v5.22.4//build with given environment

I have a main file ld.so.conf like that, with the qt5.conf like that:

root [ / ]# cat /etc/ld.so.conf
include /etc/ld.so.conf.d/*.conf
root [ / ]# cat /etc/ld.so.conf.d/qt5.conf 
/opt/qt5/lib

Is it possible I have this bug because I set a temporary prefix into an another directory (I set --prefix=/tmp/ism/builtsoftwares/opt/qt5) ?
I did that because I didn't found any support under qt for the DESTDIR variable

JoeCFD

@Fulgurance Qt5 is under /opt, but likely not set in the path.
https://doc.qt.io/qt-5/cmake-get-started.html
one of the followings should work.

Set your CMAKE_PREFIX_PATH environment variable to the Qt 5 installation prefix. This is the recommended way.
export CMAKE_PREFIX_PATH=/opt/qt5/
Set the Qt5_DIR in the CMake cache to the location of the Qt5Config.cmake file.
export Qt5_DIR=/opt/qt5/lib/cmake/Qt5

Fulgurance

@JoeCFD Is it possible as well I have this bug because I set a temporary prefix into an another directory (I set --prefix=/tmp/ism/builtsoftwares/opt/qt5) ?
I did that because I didn't found any support under qt for the DESTDIR variable

JoeCFD

@Fulgurance prefix is normally installation destination. Your build is looking for Qt5 and its env variables are not set. That is my understanding.

Fulgurance

@JoeCFD I tried both of your solutions, no one solved my problems, got same error again.

I forgot to provide you one more information, my environment.

This is my /etc/profile and /etc/profile.d/qt5.sh files:

root [ / ]# cat /etc/profile
pathremove () {
local IFS=':'
local NEWPATH
local DIR
local PATHVARIABLE=${2:-PATH}
for DIR in ${!PATHVARIABLE} ; do
        if [ "$DIR" != "$1" ] ; then
        NEWPATH=${NEWPATH:+$NEWPATH:}$DIR
        fi
done
export $PATHVARIABLE="$NEWPATH"
}

pathprepend () {
        pathremove $1 $2
        local PATHVARIABLE=${2:-PATH}
        export $PATHVARIABLE="$1${!PATHVARIABLE:+:${!PATHVARIABLE}}"
}

pathappend () {
        pathremove $1 $2
        local PATHVARIABLE=${2:-PATH}
        export $PATHVARIABLE="${!PATHVARIABLE:+${!PATHVARIABLE}:}$1"
}

export -f pathremove pathprepend pathappend

export PATH=/usr/bin

if [ ! -L /bin ]; then
        pathappend /bin
fi

if [ $EUID -eq 0 ] ; then
        pathappend /usr/sbin
        if [ ! -L /sbin ]; then
                pathappend /sbin
        fi
        unset HISTFILE
fi

export HISTSIZE=1000
export HISTIGNORE="&:[bf]g:exit"

#export XDG_DATA_DIRS=${XDG_DATA_DIRS:-/usr/share/}
#export XDG_CONFIG_DIRS=${XDG_CONFIG_DIRS:-/etc/xdg/}
#export XDG_RUNTIME_DIR=${XDG_RUNTIME_DIR:-/tmp/xdg-$USER}

NORMAL="\[\e[0m\]"
RED="\[\e[1;31m\]"
GREEN="\[\e[1;32m\]"
if [[ $EUID == 0 ]] ; then
PS1="$RED\u [ $NORMAL\w$RED ]# $NORMAL"
else
PS1="$GREEN\u [ $NORMAL\w$GREEN ]\$ $NORMAL"
fi

for script in /etc/profile.d/*.sh ; do
        if [ -r $script ] ; then
                . $script
        fi
done

unset script RED GREEN NORMALroot [ / ]# cat /etc/profile
profile    profile.d/ 
root [ / ]# cat /etc/profile.d/qt5.sh 
QT5DIR=/opt/qt5
pathappend $QT5DIR/bin           PATH
pathappend $QT5DIR/lib/pkgconfig PKG_CONFIG_PATH
export QT5DIR

JoeCFD

@Fulgurance said in qt 5.15.2 everywhere - Could not find Qt5ThemeSupport:

QT5DIR

libQt5ThemeSupport has only a static one, no dynamic so. Does it matter in your build?
And Qt5ThemeSupport_LIBRARY can not be found with PKG_CONFIG_PATH because
$QT5DIR/lib/pkgconfig does not have Qt5ThemeSupport.pc

Fulgurance

@JoeCFD Is it a problem if I would like libQt5ThemeSupport as dynamic library ?

Anyway, how can I fix this problem ? I am a bit lost now.

Is it possible for example to build Qt and make it generate Qt5ThemeSupport.pc ?

JoeCFD

@Fulgurance not sure why it is built that way. You can link a static one to your app. Simply set the right path.

Fulgurance

@JoeCFD How can I proceed ? I am not familiar with Cmake.

It's very strange only this part of Qt was generated.
It's very annoying for me because actually all of my system work with dynamic libraries

JoeCFD

@Fulgurance
add this in your cmake
target_link_libraries( ${PROJECT_NAME} $ENV{QT5DIR}/lib/libQt5ThemeSupport.a )
together with other lib links.

remove all other settings for Qt5::ThemeSupport. you may need include path as well. I do not know.

Fulgurance

@JoeCFD said in qt 5.15.2 everywhere - Could not find Qt5ThemeSupport:

target_link_libraries( ${PROJECT_NAME} $ENV{QT5DIR}/lib/libQt5ThemeSupport.a )

I have this error when I included what you said:

root [ /sources/KdeSoftwares-Main/Plasma-Integration/5.22.4/plasma-integration-5.22.4/
build ]# cmake -DCMAKE_INSTALL_PREFIX=/opt/kf5 -DCMAKE_BUILD_TYPE=Release -DBUILD_TESTING=off -Wno-dev ..
Installing in /opt/kf5. Run /sources/KdeSoftwares-Main/Plasma-Integration/5.22.4/plasma-integration-5.22.4/build/prefix.sh to set the environment for PlasmaIntegration.
-- Warning: Property URL already set to "https://xcb.freedesktop.org/", overriding it with "https://xcb.freedesktop.org"
CMake Error at CMakeLists.txt:42 (target_link_libraries):
  Cannot specify link libraries for target "PlasmaIntegration" which is not
  built by this project.


-- Configuring incomplete, errors occurred!
See also "/sources/KdeSoftwares-Main/Plasma-Integration/5.22.4/plasma-integration-5.22.4/build/CMakeFiles/CMakeOutput.log".

I put it just before the CMakeLists file is looking for this library:

# dependencies for QPA plugin
target_link_libraries( PlasmaIntegration $ENV{QT5DIR}/lib/libQt5ThemeSupport.a )
find_package(Qt5ThemeSupport REQUIRED)
set(QT5PLATFORMSUPPORT_LIBS Qt5ThemeSupport::Qt5ThemeSupport)

But to be honest I would like to know why didn't generate this library as dynamic. It can be again a problem for me later

JoeCFD

@Fulgurance
find and set are not needed. It has been hard-coded.

# dependencies for QPA plugin
message(  "qt dir = $ENV{QT5DIR}" )
target_link_libraries( PlasmaIntegration $ENV{QT5DIR}/lib/libQt5ThemeSupport.a )

is the path $ENV{QT5DIR} correct?
add message to check it out.
echo $QT5DIR

Fulgurance

@JoeCFD said in qt 5.15.2 everywhere - Could not find Qt5ThemeSupport:

message( "qt dir = $ENV{QT5DIR}" )
target_link_libraries( PlasmaIntegration $ENV{QT5DIR}/lib/libQt5ThemeSupport.a )

So I removed find and set and added your code, this is the result:

root [ /sources/KdeSoftwares-Main/Plasma-Integration/5.22.4/plasma-integration-5.22.4/
build ]# cmake -DCMAKE_INSTALL_PREFIX=/opt/kf5 -DCMAKE_BUILD_TYPE=Release -DBUILD_TESTING=off -Wno-dev ..
Installing in /opt/kf5. Run /sources/KdeSoftwares-Main/Plasma-Integration/5.22.4/plasma-integration-5.22.4/build/prefix.sh to set the environment for PlasmaIntegration.
-- Warning: Property URL already set to "https://xcb.freedesktop.org/", overriding it with "https://xcb.freedesktop.org"
qt dir = /opt/qt5
CMake Error at CMakeLists.txt:45 (target_link_libraries):
  Cannot specify link libraries for target "PlasmaIntegration" which is not
  built by this project.


-- Configuring incomplete, errors occurred!
See also "/sources/KdeSoftwares-Main/Plasma-Integration/5.22.4/plasma-integration-5.22.4/build/CMakeFiles/CMakeOutput.log".
root [ /sources/KdeSoftwares-Main/Plasma-Integration/5.22.4/plasma-integration-5.22.4/
build ]# echo $QT5DIR
/opt/qt5

So qt dir point to /opt/qt5.

Have you got an idea why Qt generate libQtThemeSupport as static library ?

JoeCFD

@Fulgurance said in qt 5.15.2 everywhere - Could not find Qt5ThemeSupport:

Cannot specify link libraries for target "PlasmaIntegration" which is not
built by this project

An important detail is to place target_link_libraries after the add_executable.
Did you add
~~
target_link_libraries( PlasmaIntegration $ENV{QT5DIR}/lib/libQt5ThemeSupport.a )
~~
after

add_executable( ... )

like
~~
add_executable( ... )
target_link_libraries( PlasmaIntegration $ENV{QT5DIR}/lib/libQt5ThemeSupport.a )
~~

I have no idea why. But does it matter?

Fulgurance

@JoeCFD I don't have any line like:

add_executable

This is the CMakeLists file:

root [ /sources/KdeSoftwares-Main/Plasma-Integration/5.22.4/plasma-integration-5.22.4/
build ]# cat ../CMakeLists.txt 
cmake_minimum_required(VERSION 3.16)

project(PlasmaIntegration)
set(PROJECT_VERSION "5.22.4")
set(PROJECT_VERSION_MAJOR 5)

set(QT_MIN_VERSION "5.15.0")
set(KF5_MIN_VERSION "5.82")

find_package(ECM ${KF5_MIN_VERSION}  REQUIRED NO_MODULE)
set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules ${ECM_MODULE_PATH} )

include(KDEInstallDirs)
include(KDECMakeSettings)
include(KDECompilerSettings NO_POLICY_SCOPE)
include(FeatureSummary)
include(GenerateExportHeader)
include(KDEClangFormat)

find_package(Qt5 ${QT_MIN_VERSION} CONFIG REQUIRED Widgets DBus X11Extras QuickControls2)
find_package(Qt5Gui ${QT_MIN_VERSION} CONFIG REQUIRED Private)

find_package(KF5 ${KF5_MIN_VERSION} REQUIRED COMPONENTS
                Config ConfigWidgets I18n IconThemes KIO Notifications Wayland
                WidgetsAddons WindowSystem ConfigWidgets
)

find_package(XCB COMPONENTS XCB)
set_package_properties(XCB PROPERTIES
    DESCRIPTION "X protocol C-language Binding"
    URL "https://xcb.freedesktop.org"
    TYPE REQUIRED
    PURPOSE "Required to pass style properties to native Windows on X11 Platform"
)

find_package(Breeze 5 CONFIG)
set_package_properties(Breeze PROPERTIES
                       TYPE REQUIRED
                       PURPOSE "For setting the default QStyle name")

# dependencies for QPA plugin
#find_package(Qt5ThemeSupport REQUIRED)
#set(QT5PLATFORMSUPPORT_LIBS Qt5ThemeSupport::Qt5ThemeSupport)
message(  "qt dir = $ENV{QT5DIR}" )
target_link_libraries( PlasmaIntegration $ENV{QT5DIR}/lib/libQt5ThemeSupport.a )

add_definitions(-DTRANSLATION_DOMAIN=\"plasmaintegration5\")
if (IS_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/po")
    ki18n_install(po)
endif()
add_subdirectory(src)
add_subdirectory(autotests)
add_subdirectory(tests)

find_package(FontNotoSans)
set_package_properties(FontNotoSans PROPERTIES
    PURPOSE "Default sans-serif font -- this is not detected automatically, pass -DCMAKE_DISABLE_FIND_PACKAGE_FontNotoSans=true to mark it ignored."
    URL "https://www.google.com/get/noto/"
    TYPE RUNTIME
)
find_package(FontHack)
set_package_properties(FontHack PROPERTIES
    PURPOSE "Default monospace font -- this is not detected automatically, pass -DCMAKE_DISABLE_FIND_PACKAGE_FontHack=true to mark it ignored."
    URL "https://sourcefoundry.org/hack/"
    TYPE RUNTIME
)

# add clang-format target for all our real source files
file(GLOB_RECURSE ALL_CLANG_FORMAT_SOURCE_FILES *.cpp *.h)
kde_clang_format(${ALL_CLANG_FORMAT_SOURCE_FILES})

feature_summary(WHAT ALL INCLUDE_QUIET_PACKAGES FATAL_ON_MISSING_REQUIRED_PACKAGES)

It's just I would like my system full of dynamic library. Anyway, at the moment, we will try first to compile this :)

If I put your code at the very end of the CMakeLists file, I have this error:

root [ /sources/KdeSoftwares-Main/Plasma-Integration/5.22.4/plasma-integration-5.22.4/
build ]# cmake -DCMAKE_INSTALL_PREFIX=/opt/kf5 -DCMAKE_BUILD_TYPE=Release -DBUILD_TESTING=off -Wno-dev ..
Installing in /opt/kf5. Run /sources/KdeSoftwares-Main/Plasma-Integration/5.22.4/plasma-integration-5.22.4/build/prefix.sh to set the environment for PlasmaIntegration.
-- Warning: Property URL already set to "https://xcb.freedesktop.org/", overriding it with "https://xcb.freedesktop.org"
-- Warning: Property URL already set to "https://xcb.freedesktop.org", overriding it with "https://xcb.freedesktop.org/"
CMake Warning at CMakeLists.txt:55 (find_package):
  By not providing "FindFontNotoSans.cmake" in CMAKE_MODULE_PATH this project
  has asked CMake to find a package configuration file provided by
  "FontNotoSans", but CMake did not find one.

  Could not find a package configuration file provided by "FontNotoSans" with
  any of the following names:

    FontNotoSansConfig.cmake
    fontnotosans-config.cmake

  Add the installation prefix of "FontNotoSans" to CMAKE_PREFIX_PATH or set
  "FontNotoSans_DIR" to a directory containing one of the above files.  If
  "FontNotoSans" provides a separate development package or SDK, be sure it
  has been installed.


CMake Warning at CMakeLists.txt:61 (find_package):
  By not providing "FindFontHack.cmake" in CMAKE_MODULE_PATH this project has
  asked CMake to find a package configuration file provided by "FontHack",
  but CMake did not find one.

  Could not find a package configuration file provided by "FontHack" with any
  of the following names:

    FontHackConfig.cmake
    fonthack-config.cmake

  Add the installation prefix of "FontHack" to CMAKE_PREFIX_PATH or set
  "FontHack_DIR" to a directory containing one of the above files.  If
  "FontHack" provides a separate development package or SDK, be sure it has
  been installed.


-- The following OPTIONAL packages have been found:

 * KF5Service (required version >= 5.85.0)
 * KF5Completion (required version >= 5.85.0)
 * KF5ItemViews (required version >= 5.85.0)
 * KF5JobWidgets (required version >= 5.85.0)
 * KF5Solid (required version >= 5.85.0)
 * KF5XmlGui (required version >= 5.85.0)
 * KF5CoreAddons (required version >= 5.85.0)
 * KF5Auth (required version >= 5.85.0)
 * Qt5Core (required version >= 5.15.0)
 * KF5Codecs (required version >= 5.85.0)
 * Freetype
 * Fontconfig
 * PkgConfig
 * Qt5Test (required version >= 5.15.0)

-- The following REQUIRED packages have been found:

 * ECM (required version >= 5.82)
 * Qt5QmlModels (required version >= 5.15.2)
 * Qt5Quick (required version >= 5.15.2)
 * Qt5QuickControls2
 * Gettext
 * KF5I18n (required version >= 5.82)
 * KF5IconThemes (required version >= 5.82)
 * Qt5Network (required version >= 5.15.0)
 * KF5KIO (required version >= 5.82)
 * KF5Notifications (required version >= 5.82)
 * KF5Wayland (required version >= 5.82)
 * Qt5Gui (required version >= 5.15.0)
 * KF5WindowSystem (required version >= 5.82)
 * Qt5DBus (required version >= 5.15.0)
 * KF5Config (required version >= 5.85.0)
 * Qt5Widgets (required version >= 5.15.0)
 * KF5WidgetsAddons (required version >= 5.85.0)
 * KF5ConfigWidgets (required version >= 5.82)
 * KF5 (required version >= 5.82)
 * Breeze (required version >= 5)
   For setting the default QStyle name
 * X11, Required for updating the Cursor theme on X11, <https://www.x.org>
 * Qt5X11Extras
 * Qt5 (required version >= 5.15.0)
 * XCB, X protocol C-language Binding, <https://xcb.freedesktop.org/>
   Required to pass style properties to native Windows on X11 Platform
 * Qt5Qml (required version >= 5.15.0)

-- The following RUNTIME packages have not been found:

 * FontNotoSans, <https://www.google.com/get/noto/>
   Default sans-serif font -- this is not detected automatically, pass -DCMAKE_DISABLE_FIND_PACKAGE_FontNotoSans=true to mark it ignored.
 * FontHack, <https://sourcefoundry.org/hack/>
   Default monospace font -- this is not detected automatically, pass -DCMAKE_DISABLE_FIND_PACKAGE_FontHack=true to mark it ignored.

CMake Error at CMakeLists.txt:74 (target_link_libraries):
  Cannot specify link libraries for target "PlasmaIntegration" which is not
  built by this project.


-- Configuring incomplete, errors occurred!
See also "/sources/KdeSoftwares-Main/Plasma-Integration/5.22.4/plasma-integration-5.22.4/build/CMakeFiles/CMakeOutput.log".

This is the archive if you want to have a look: https://download.kde.org/stable/plasma/5.22.4/plasma-integration-5.22.4.tar.xz

JoeCFD

@Fulgurance said in qt 5.15.2 everywhere - Could not find Qt5ThemeSupport:

"FontNotoSans", but CMake did not find one.

"FontNotoSans", but CMake did not find one.
sudo apt-get install fonts-noto

https://packages.ubuntu.com/search?keywords=fonts-noto

if there is still error when the file is put to the end of the cmake file, that could mean you have a few cmake files. Try
grep -RHi add_executable
to find which cmake file has add_executable. Then add
target_link_libraries( PlasmaIntegration $ENV{QT5DIR}/lib/libQt5ThemeSupport.a )
just below that line in that file.

Fulgurance

This post is deleted!

Fulgurance

I finally found how to do, just pass explicitely some libraries dir to cmake:

-DCMAKE_INSTALL_PREFIX=/opt/kf5
                            -DQt5ThemeSupport_LIBRARY=/opt/qt5/lib/libQt5ThemeSupport.a
                            -DQt5ThemeSupport_INCLUDE_DIR=/opt/qt5/include/QtThemeSupport/5.15.2
                            -DQt5DBus_DIR=/opt/qt5/lib/cmake/Qt5DBus
                            -DCMAKE_BUILD_TYPE=Release
                            -DBUILD_TESTING=OFF
                            -Wno-dev

It was a bit tricky to be honest. Thanks for your help