Package: vtk9 Followup-For: Bug #1141884 Building vtk9 for all supported python is a grand challenge because of the cmake problem: cmake does not easily build support for multiple python version. It can manage selection of version, but not multiple in the same build.
Building for non-default python could possibly be set up, but it's a bit of effort, and I'm not sure it wouldn't give auxiliary problems, e.g. VTK C++ modules (not python modules) linking to a specific libpython3.Y.so, which can't be managed so easily. e.g. Rendering/PythonContext2D, /usr/lib/x86_64-linux-gnu/libvtkPythonContext2D-9.6.so links to libvtkWrappingPythonCore3.14-9.6.so.1 Your second idea might be the only practical way to manage it, set up a dummy dependency so vtk9 catches the python default transitions.
