6.7.1 FTBFS

  cmake -B build -S pyside-setup -G Ninja \
    -DCMAKE_INSTALL_PREFIX=/usr \
    -DCMAKE_BUILD_TYPE=None \
    -DSHIBOKEN_PYTHON_LIBRARIES=`pkgconf python3-embed --libs` \
    -DBUILD_TESTS=OFF \
    -DFORCE_LIMITED_API=no \
    -DNO_QT_TOOLS=yes
  PYTHONPATH="$PWD"/build/sources \
  cmake --build build

FAILED: sources/shiboken6/libshiboken/CMakeFiles/libshiboken.dir/sbkmodule.cpp.o 
/usr/bin/c++ -DBUILD_LIBSHIBOKEN -I/build/pyside6/src/pyside-setup/sources/shiboken6/libshiboken -I/build/pyside6/src/build/sources/shiboken6/libshiboken -I/usr/include/python3.12 -march=x86-64 -mtune=generic -O2 -pipe -fno-plt -fexceptions         -Wp,-D_FORTIFY_SOURCE=3 -Wformat -Werror=format-security         -fstack-clash-protection -fcf-protection         -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -Wp,-D_GLIBCXX_ASSERTIONS -g -ffile-prefix-map=/build/pyside6/src=/usr/src/debug/pyside6 -flto=auto -Wall -Wextra -Wno-strict-aliasing -Wno-cast-function-type -fvisibility=hidden -D QT_NO_CAST_FROM_ASCII -D QT_NO_CAST_TO_ASCII -std=gnu++17 -fPIC   -fPIC -MD -MT sources/shiboken6/libshiboken/CMakeFiles/libshiboken.dir/sbkmodule.cpp.o -MF sources/shiboken6/libshiboken/CMakeFiles/libshiboken.dir/sbkmodule.cpp.o.d -o sources/shiboken6/libshiboken/CMakeFiles/libshiboken.dir/sbkmodule.cpp.o -c /build/pyside6/src/pyside-setup/sources/shiboken6/libshiboken/sbkmodule.cpp
/build/pyside6/src/pyside-setup/sources/shiboken6/libshiboken/sbkmodule.cpp: In function 'PyObject* Shiboken::Module::create(const char*, void*)':
/build/pyside6/src/pyside-setup/sources/shiboken6/libshiboken/sbkmodule.cpp:459:15: error: 'Shiboken::Conversions' has not been declared
  459 |     Shiboken::Conversions::clearNegativeLazyCache();
      |               ^~~~~~~~~~~