expected behavior: 'mpicc -v' should tell me something like "mpicc for MPICH2 version 1.4a1" or "mpicc for 1.1".

observed behavior: 'mpicc -v' give me only compiler flags, mentioning nothing about the mpi implementation version.

fallout: the HDF5 configure checks do not find the string they expect and then fail to enable some significant optimizations.