Great question — answering as the UphillTech team:
If you have an MPI compiler installed, you would set MPICXX_USR to the path of its C++ wrapper script (such as mpic++ or mpicxx ). If you don't have MPI installed and don't want to use MPI, you should set USE_MPI to the string OFF . The error message says that to set MPICXX_USR you should edit the file MAKE/Makefile.user . The USE_MPI variable is also settable in this file. Assuming you have mpic++ installed and that you want to use MPI to compile this software, determine where mpic++ is located using command -v mpic++ Then set MPICXX_USR to this value in MAKE/Makefile.user . The file MAKE/Makefile.user_default contains the defaults used when compiling LIGGGHTS (this file should probably...
Full answer by Kusalananda: https://unix.stackexchange.com/a/501292 (CC BY-SA 4.0).
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