diff --git a/.github/workflows/CI-unixish-docker.yml b/.github/workflows/CI-unixish-docker.yml
index 21d54052ef2..d19710a4dc5 100644
--- a/.github/workflows/CI-unixish-docker.yml
+++ b/.github/workflows/CI-unixish-docker.yml
@@ -58,6 +58,7 @@ jobs:
       - name: Install missing software (gui) on latest ubuntu
         if: matrix.build_gui
         run: |
+          # TODO: add qt6-documentation-tools for qhelpgenerator - currently fails with "qhelpgenerator: could not find a Qt installation of ''" - see https://askubuntu.com/a/1460243
           apt-get install -y qt6-base-dev qt6-charts-dev qt6-tools-dev
 
       # needs to be called after the package installation since
diff --git a/.github/workflows/CI-unixish.yml b/.github/workflows/CI-unixish.yml
index 5649d3362f0..b6586bad54f 100644
--- a/.github/workflows/CI-unixish.yml
+++ b/.github/workflows/CI-unixish.yml
@@ -51,9 +51,11 @@ jobs:
         if: contains(matrix.os, 'ubuntu') && matrix.use_qt6 == 'On'
         run: |
           sudo apt-get update
+          sudo apt-get install libxml2-utils libtinyxml2-dev
           # qt6-tools-dev-tools for lprodump
           # qt6-l10n-tools for lupdate
-          sudo apt-get install libxml2-utils libtinyxml2-dev qt6-base-dev libqt6charts6-dev qt6-tools-dev qt6-tools-dev-tools qt6-l10n-tools libglx-dev libgl1-mesa-dev
+          # TODO: add qt6-documentation-tools for qhelpgenerator - currently fails with "qhelpgenerator: could not find a Qt installation of ''" - see https://askubuntu.com/a/1460243
+          sudo apt-get install qt6-base-dev libqt6charts6-dev qt6-tools-dev qt6-tools-dev-tools qt6-l10n-tools libglx-dev libgl1-mesa-dev
 
       # coreutils contains "nproc"
       - name: Install missing software on macos
@@ -127,9 +129,11 @@ jobs:
         if: contains(matrix.os, 'ubuntu') && matrix.use_qt6 == 'On'
         run: |
           sudo apt-get update
+          sudo apt-get install libxml2-utils
           # qt6-tools-dev-tools for lprodump
           # qt6-l10n-tools for lupdate
-          sudo apt-get install libxml2-utils qt6-base-dev libqt6charts6-dev qt6-tools-dev qt6-tools-dev-tools qt6-l10n-tools libglx-dev libgl1-mesa-dev
+          # TODO: add qt6-documentation-tools for qhelpgenerator - currently fails with "qhelpgenerator: could not find a Qt installation of ''" - see https://askubuntu.com/a/1460243
+          sudo apt-get install qt6-base-dev libqt6charts6-dev qt6-tools-dev qt6-tools-dev-tools qt6-l10n-tools libglx-dev libgl1-mesa-dev
 
       # coreutils contains "nproc"
       - name: Install missing software on macos
@@ -515,6 +519,7 @@ jobs:
           sudo apt-get update
           # qt6-tools-dev-tools for lprodump
           # qt6-l10n-tools for lupdate
+          # TODO: add qt6-documentation-tools for qhelpgenerator - currently fails with "qhelpgenerator: could not find a Qt installation of ''" - see https://askubuntu.com/a/1460243
           sudo apt-get install qt6-base-dev libqt6charts6-dev qt6-tools-dev qt6-tools-dev-tools qt6-l10n-tools libglx-dev libgl1-mesa-dev
           sudo apt-get install libboost-container-dev
 
diff --git a/cmake/findDependencies.cmake b/cmake/findDependencies.cmake
index bdfc171d7e9..2cbf3d106c9 100644
--- a/cmake/findDependencies.cmake
+++ b/cmake/findDependencies.cmake
@@ -28,6 +28,17 @@ if(BUILD_GUI)
         find_package(Qt5 COMPONENTS ${qt_components} REQUIRED)
         set(QT_VERSION "${Qt5Core_VERSION_STRING}")
     endif()
+
+    find_program(QHELPGENERATOR qhelpgenerator)
+    if(NOT QHELPGENERATOR)
+        # TODO: how to properly get the Qt binary folder?
+        # piggy-back off Qt::qmake for now as it should be in the same folder as the binary we are looking for
+        get_target_property(_qmake_executable Qt::qmake IMPORTED_LOCATION)
+        get_filename_component(_qt_bin_dir ${_qmake_executable} DIRECTORY)
+        message(STATUS "qhelpgenerator not found in PATH - trying ${_qt_bin_dir}")
+        # cannot be mandatory since qhelpgenerator is missing from the official qttools Linux package - https://bugreports.qt.io/browse/QTBUG-116168
+        find_program(QHELPGENERATOR qhelpgenerator HINTS ${_qt_bin_dir})
+    endif()
 endif()
 
 if(HAVE_RULES)
diff --git a/cmake/printInfo.cmake b/cmake/printInfo.cmake
index bb633650b7d..97681645035 100644
--- a/cmake/printInfo.cmake
+++ b/cmake/printInfo.cmake
@@ -73,6 +73,7 @@ if(BUILD_GUI)
         message(STATUS "Qt5Core_LIBRARIES =     ${Qt5Core_LIBRARIES}")
         message(STATUS "Qt5Core_INCLUDE_DIRS =  ${Qt5Core_INCLUDE_DIRS}")
     endif()
+    message(STATUS "QHELPGENERATOR =        ${QHELPGENERATOR}")
 endif()
 message(STATUS)
 message(STATUS "HAVE_RULES =            ${HAVE_RULES}")
diff --git a/gui/CMakeLists.txt b/gui/CMakeLists.txt
index 31fe62eaf64..2f86d568331 100644
--- a/gui/CMakeLists.txt
+++ b/gui/CMakeLists.txt
@@ -71,6 +71,12 @@ CheckOptions:
         target_compile_options_safe(cppcheck-gui -Wno-redundant-parens)
     endif()
 
+    if (QHELPGENERATOR)
+        # TODO: generate in CMAKE_BINARY_DIR folder
+        add_custom_target(online-help.qhc ${QHELPGENERATOR} ${CMAKE_CURRENT_SOURCE_DIR}/help/online-help.qhcp -o ${CMAKE_CURRENT_SOURCE_DIR}/help/online-help.qhc)
+        add_dependencies(cppcheck-gui online-help.qhc)
+    endif()
+
     install(TARGETS cppcheck-gui RUNTIME DESTINATION ${CMAKE_INSTALL_FULL_BINDIR} COMPONENT applications)
     install(FILES ${qms} DESTINATION ${CMAKE_INSTALL_FULL_BINDIR} COMPONENT applications)