not getting C outputs in Jupyter notebooks with "modern" MacPorts install

[aeszym]

Is it possible that the step from ipykernel 5.xx to 6.xx broke that way wurlitzer captures stdout (specifically, when %load_ext'ing it in Jupyter Lab)? I'm afraid I do not have the time right now to do a careful bi-section, but with my up-to-date MacPorts install, with ipykernel 6.29.5, it does not work, while with an Anaconda install, with ipykernel 5.1.2, it does.

The changelog for 6.0.0 specifically says:
All outputs to stdout/stderr should now be captured, including subprocesses
and output of compiled libraries (blas, lapack....). In notebook
server, some outputs that would previously go to the notebooks logs will now
both head to notebook logs and in notebooks outputs. In terminal frontend
like Jupyter Console, Emacs or other, this may ends up as duplicated outputs.

which causes me to believe they were probably trying to add the wurlitzer functionality. (But I am not getting the output in the cell either with or without wurlitzer loaded)

Thanks,
Andy S.