Unable to build examples when building as module with -DQT_BUILD_EXAMPLES=ON

/home/stampho/work/Qt/qt6-dev-release/qtbase/bin/qt-configure-module \
    /home/stampho/work/Qt/qt6-dev-src/qtwebengine \
    -- \
    -DQT_FEATURE_webengine_proprietary_codecs=ON \
    -DQT_BUILD_TESTS=ON \
    -DQT_BUILD_EXAMPLES=ON

cmake --build .

FAILED: examples/pdfwidgets/pdfviewer-ep/stamp/pdfviewer-9d70-configure /home/stampho/work/Qt/qtwebengine-dev-release/examples/pdfwidgets/pdfviewer-ep/stamp/pdfviewer-9d70-configure 
cd /home/stampho/work/Qt/qtwebengine-dev-release/examples/pdfwidgets/pdfviewer && /usr/bin/cmake -GNinja -C/home/stampho/work/Qt/qtwebengine-dev-release/examples/pdfwidgets/pdfviewer-ep/tmp/pdfviewer-9d70-cache-Release.cmake /home/stampho/work/Qt/qt6-dev-src/qtwebengine/examples/pdfwidgets/pdfviewer && /usr/bin/cmake -E touch /home/stampho/work/Qt/qtwebengine-dev-release/examples/pdfwidgets/pdfviewer-ep/stamp/pdfviewer-9d70-configure
loading initial cache file /home/stampho/work/Qt/qtwebengine-dev-release/examples/pdfwidgets/pdfviewer-ep/tmp/pdfviewer-9d70-cache-Release.cmake
-- Configuring done
CMake Error at /home/stampho/work/Qt/qt6-dev-release/qtbase/lib/cmake/Qt6Core/Qt6CoreMacros.cmake:559 (add_executable):
  Target "pdfviewerwidgets" links to target "Qt::PdfWidgets" but the target
  was not found.  Perhaps a find_package() call is missing for an IMPORTED
  target, or an ALIAS target is missing?
Call Stack (most recent call first):
  /home/stampho/work/Qt/qt6-dev-release/qtbase/lib/cmake/Qt6Core/Qt6CoreMacros.cmake:523 (_qt_internal_create_executable)
  /home/stampho/work/Qt/qt6-dev-release/qtbase/lib/cmake/Qt6Core/Qt6CoreMacros.cmake:952 (qt6_add_executable)
  CMakeLists.txt:22 (qt_add_executable)


-- Generating done
CMake Generate step failed.  Build files cannot be regenerated correctly.