MUMPS not being linked against in 'stable' test environment
Looking at any of the CI logs for testing in the 'stable' environment (uses Conda with the oldest supported dependency versions) shows that the mumps tests are skipped.
This indicates that mumps is not being linked against, however it is not clear why.
Initially I thought that it may be due to
library_dirs not being set correctly (to the appropriate paths of the conda environment), however if this were the case then the
latest environment should also have this problem, and it doesn't.