Hello, The 1.6 release of openmpi fails badly on ia64, see Bug #720419. As no solution appears to be forthcoming, maybe the best would be to remove ia64 from openmpi's arch list and switch to mpich2 as default implementation for mpi-default-{bin,dev}? I built aces3 on merulo.debian.org with mpich2, and did not encounter any problem, are there known issues with mpich2 on ia64? Michael