Failed to concretize spec: unsupported variant 'mpi' for package 'hdf5' – Concretizer component
Goal: reduce the learning curve for newcomers by allowing the concretizer to automatically accept an external MPI implementation when a package’s mpi variant is requested but not provided by the package itself. Uncertainty: Spack’s concretizer currently treats the mpi variant as a hard constraint; it can be configured to relax variant constraints when a comp