LAMMPS (21 Feb 2017) ERROR: Unknown pair style eam/alloy/opt (../force.cpp:244)

ERROR: Unknown pair style eam/alloy/opt (…/force.cpp:244)

You need to install the “OPT” package. Type “make yes-opt” in the /src directory and recompile. You will also need to install the “MANYBODY” package if you haven’t done that as well.

Stan