scriptableapplication build fails (from wheels)

[✔] pylon:~/dev  % source env5.11.1/bin/activate
[✔] pylon:~/dev  % which python
/home/crmaurei/dev/env5.11.1/bin/python
[✔] pylon:~/dev  % pip install PySide2
Collecting PySide2
  Using cached https://files.pythonhosted.org/packages/2b/cc/7aac6eae6ae145a4ef6b560c710a209c24457d857b63ca4a9d532c67e589/PySide2-5.11.1-5.11.1-cp35.cp36.cp37-abi3-manylinux1_x86_64.whl
Installing collected packages: PySide2
Successfully installed PySide2-5.11.1
[✔] pylon:~/dev  % cd pyside5.11/examples/scriptableapplication/build 
[✔] pylon:~/dev/pyside5.11/examples/scriptableapplication/build (5.11↑1|●1…) % cmake -H.. -B. -G "Unix Makefiles" -DCMAKE_BUILD_TYPE=Release

-- Configuring done
-- Generating done
-- Build files have been written to: /home/crmaurei/dev/pyside5.11/examples/scriptableapplication/build
[✔] pylon:~/dev/pyside5.11/examples/scriptableapplication/build (5.11↑1|●1…) % ls
CMakeFiles/  CMakeCache.txt  Makefile  cmake_install.cmake
[✔] pylon:~/dev/pyside5.11/examples/scriptableapplication/build (5.11↑1|●1…) % make -j4
Scanning dependencies of target scriptableapplication_autogen
[ 10%] Running generator for /home/crmaurei/dev/pyside5.11/examples/scriptableapplication/scriptableapplication.xml.
qt.shiboken: (scriptableapplication) Unknown attribute for 'add-function': 'allow-thread'
qt.shiboken: (scriptableapplication) CLANG builtins includes directory: /usr/lib/clang/6.0.1/include
(scriptableapplication) clang_parseTranslationUnit2(0x0, cmd[14]=-isystem/usr/lib/clang/6.0.1/include -fPIC -Wno-constant-logical-operand -std=c++14 -I/usr/include/qt/ -I/usr/include/qt/QtCore -I/usr/lib/qt//mkspecs/linux-g++ -I/usr/include/qt/ -I/usr/include/qt/QtGui -I/usr/include -I/usr/include/qt/ -I/usr/include/qt/QtWidgets -I/home/crmaurei/dev/pyside5.11/examples/scriptableapplication /tmp/wrappedclasses_XZaGEX.hpp)
Generating class model...                    [WARNING]
Generating enum model...                     [OK]
Generating namespace model...                [OK]
Resolving typedefs...                        [OK]
Fixing class inheritance...                  [OK]
Detecting inconsistencies in class model...  [OK]
[OK]

Done, 854ms, 1 warnings (165 known issues)
[ 20%] Automatic MOC for target scriptableapplication
[ 20%] Built target scriptableapplication_autogen
Scanning dependencies of target scriptableapplication
[ 30%] Building CXX object CMakeFiles/scriptableapplication.dir/mainwindow.cpp.o
[ 40%] Building CXX object CMakeFiles/scriptableapplication.dir/pythonutils.cpp.o
[ 50%] Building CXX object CMakeFiles/scriptableapplication.dir/main.cpp.o
[ 60%] Building CXX object CMakeFiles/scriptableapplication.dir/AppLib/applib_module_wrapper.cpp.o
[ 70%] Building CXX object CMakeFiles/scriptableapplication.dir/AppLib/mainwindow_wrapper.cpp.o
[ 80%] Building CXX object CMakeFiles/scriptableapplication.dir/scriptableapplication_autogen/mocs_compilation.cpp.o
[ 90%] Linking CXX executable scriptableapplication
/home/crmaurei/dev/env5.11.1/lib/python3.6/site-packages/PySide2/Qt/lib/libQt5Qml.so.5: undefined reference to `operator delete(void*, unsigned long)@Qt_5'
/home/crmaurei/dev/env5.11.1/lib/python3.6/site-packages/PySide2/Qt/lib/libQt5Qml.so.5: undefined reference to `operator delete[](void*, unsigned long)@Qt_5'
collect2: error: ld returned 1 exit status
make[2]: *** [CMakeFiles/scriptableapplication.dir/build.make:173: scriptableapplication] Error 1
make[1]: *** [CMakeFiles/Makefile2:68: CMakeFiles/scriptableapplication.dir/all] Error 2
make: *** [Makefile:84: all] Error 2