Instructions for building with MPI
I couldn't find any instructions on how to build with support for MPI, but I was able to get the following to work for gcc and icc (versions before 2019), https://sympa.ligo.org/wws/arc/daswg/2019-10/msg00076.html
If there are no such instructions then it would be helpful to add them, including how to use a recent (2019+) version of icc.