Yes, the scons build command separates out different “extras” builds into different subdirectories under build/, so you can have both an MPI and a “default” Rosetta living in the same directory. The one issue would be the two-part name in the bin/ directory (e.g. relax.linuxgccrelease versus relax.default.linuxgccrelease or relax.mpi.linuxgccrelease) – that corresponds to the last compile you’ve done, so an MPI compile will overwrite the default compile. If you use the three-part names, though, you’ll be explicit about which version you want to use.
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