Regarding https://trac.mpich.org/projects/mpich/ticket/2231... I still care about this issue and will work on a patch if the MPICH developers will (1) evaluate the merits of the proposed options so I know where to start and where to not bother at all; (2) figure out a meaningful ABI version scheme and implement it, since the current code contains "ABIVERSION = 0:0:0", which is not useful. One of the motivations for this feature require is that MKL ScaLAPACK is compiled against Intel MPI, OpenMPI and SGI MPT. I would like to be able to explicitly verify that the libraries compiled against Intel MPI can be run with MPICH or other derivatives thereof. Obviously, this requires both sides (the Intel MPI against which MKL is compiler and the user's MPI library) to support this sort of feature, so the earlier that it is implemented in MPICH, the earlier I have some hope of using it. Thanks, Jeff -- Jeff Hammond [email protected] http://jeffhammond.github.io/