make MPI optional #82
Description
With the addition of SPR MPI became a required dependency:
Line 12 in ef76a31
Ideally, we can support serial builds. SPR could remain functional by not compiling/running the MPI parallel reductions.
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With the addition of SPR MPI became a required dependency:
Line 12 in ef76a31
Ideally, we can support serial builds. SPR could remain functional by not compiling/running the MPI parallel reductions.