Currently, the documentation for building from source says to run make install after CMake. So far (build in progress) it seems that you can build in parallel. It would be nice to explicitly address this issue.
I can confirm success of dmpar build & install on macOS using GCC/GFortran 9 (brewed) and OpenMPI (brewed) with make -j 12 install on a 6-core Intel core-i9 with hyper threading enabled.
Currently, the documentation for building from source says to run
make install
after CMake. So far (build in progress) it seems that you can build in parallel. It would be nice to explicitly address this issue.