Qt for Python (PySide/Shiboken)

The effect on gentoo is worse. This seems basically the interaction between clang and gcc. [ 46%] Running generator for /home/skinkie/Sources/widgetbinding/bindings.xml. qt.shiboken: (bindings) findClangBuiltInIncludesDir: Falling back from /usr/lib/llvm/20/lib64 to /usr/lib/llvm/20/lib. qt.shiboken: (bindings) findClangBuiltInIncludesDir: No subdirectories found in /usr/lib/llvm/20/lib/clang. qt.shiboken: (bindings) CLANG v0.64, builtins includes directory: /usr/lib/llvm/20/include /usr/lib/gcc/x86_64-pc-linux-gnu/15/include/g++-v15/cstddef:52:10: fatal error: 'stddef.h' file not found (bindings) Errors in /tmp/bindings_ZKXgsq.hpp: /usr/lib/gcc/x86_64-pc-linux-gnu/15/include/g++-v15/cstddef:52:10: fatal: 'stddef.h' file not found /tmp/bindings_ZKXgsq.hpp:1:10: note: in file included from /tmp/bindings_ZKXgsq.hpp:1: /home/skinkie/Sources/widgetbinding/bindings.h:6:10: note: in file included from /home/skinkie/Sources/widgetbinding/bindings.h:6: /home/skinkie/Sources/widgetbinding/wigglywidget.h:7:10: note: in file included from /home/skinkie/Sources/widgetbinding/wigglywidget.h:7: /home/skinkie/Sources/widgetbinding/macros.h:7:10: note: in file included from /home/skinkie/Sources/widgetbinding/macros.h:7: /usr/include/qt6/QtCore/qglobal.h:14:12: note: in file included from /usr/include/qt6/QtCore/qglobal.h:14: (bindings) Clang: 1 diagnostic messages: /usr/lib/gcc/x86_64-pc-linux-gnu/15/include/g++-v15/cstddef:52:10: fatal: 'stddef.h' file not found /tmp/bindings_ZKXgsq.hpp:1:10: note: in file included from /tmp/bindings_ZKXgsq.hpp:1: /home/skinkie/Sources/widgetbinding/bindings.h:6:10: note: in file included from /home/skinkie/Sources/widgetbinding/bindings.h:6: /home/skinkie/Sources/widgetbinding/wigglywidget.h:7:10: note: in file included from /home/skinkie/Sources/widgetbinding/wigglywidget.h:7: /home/skinkie/Sources/widgetbinding/macros.h:7:10: note: in file included from /home/skinkie/Sources/widgetbinding/macros.h:7: /usr/include/qt6/QtCore/qglobal.h:14:12: note: in file included from /usr/include/qt6/QtCore/qglobal.h:14: Keeping temporary file: /tmp/bindings_ZKXgsq.hpp shiboken: Error running ApiExtractor. Command line: "--generator-set=shiboken" "--enable-parent-ctor-heuristic" "--enable-pyside-extensions" "--enable-return-value-heuristic" "--use-isnull-as-nb_nonzero" "--avoid-protected-hack" "-I/usr/include/qt6/QtWidgets" "-I/usr/include/qt6" "-I/home/skinkie/Sources/widgetbinding" "-T/home/skinkie/Sources/widgetbinding" "-T/mnt/storage/home/skinkie/Sources/widgetbinding/build/venv/lib/python3.12/site-packages/PySide6/typesystems" "--output-directory=/home/skinkie/Sources/widgetbinding/build" "/home/skinkie/Sources/widgetbinding/bindings.h" "/home/skinkie/Sources/widgetbinding/bindings.xml" make[2]: *** [CMakeFiles/wiggly_autogen_timestamp_deps.dir/build.make:75: wiggly/wiggly_module_wrapper.cpp] Error 1 make[1]: *** [CMakeFiles/Makefile2:225: CMakeFiles/wiggly_autogen_timestamp_deps.dir/all] Error 2 make: *** [Makefile:136: all] Error 2