This eliminates annoying fs-violation errors, notably from textproc/itstool and textproc/gtk-doc where the byte code is generated at build time instead of already having been generated by py-libxml2. It is still peculiar to me that these files are dumped directly into PYTHON_SITELIBDIR and don't have a subdirectory of their own. Worth investigating, but hierachical changes are obviously more intrusive and beyond this scope.