from 'adjustment.128x64x1/Makefile_head', extract:
# executed by:
#    mlosch@rays2:/csys/nobackup1_ODYN/mlosch/tmp_f90/MITgcm/verification/adjustment.128x64x1/build
OPTFILE="/csys/nobackup1_ODYN/mlosch/tmp_f90/MITgcm/tools/build_options/sunos_sun4u_f90"