Addons to the model makefiles exist in the
/home/armnlib/ssm_gem_3.2.2/all/share/modeles/GEMDM/v_3.2.2
directory (assuming that you have inserted the correct model version and SSM home path
here). There are several options already there, but you will need one named
Makefile_${ARCH}. Check your $ARCH and make sure that an
appropriate makefile addition is present (even if it is empty). If this file does not
exist for your architecture, you will have to copy it from the closest one that you
can find in this directory, and make any necessary modifications.