Over the past few days, something changed and the Slycot CI check is now failing in GitHub actions. Here is an example:

https://github.com/python-control/python-control/actions/runs/15817454639/job/44617194878

The error is in control/tests/optimal_test and it looks like some of the optimization checks are no longer converging to the expected answer. Looks OK in the runs that use slycot from conda, so perhaps something different in the build dependencies?