Tested Sonoma configuration on apple M3

platform/build/make.inc.OSX_SONOMA_M3

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+#---------------------------------------------------
+#
+# brew installation instructions on OSX Sonoma, 
+# tested on a brand new M3 Max chip. PRF
+#
+# 1) install brew if not there yet
+# 2) Install compilers and packages:
+#        brew install gfortran
+#        brew install open-mpi
+#        brew install fftw
+#        brew install netcdf
+#        brew install netcdf-fortran
+# 3) if using python3, make sure python is understood:
+#        ln -s -f /usr/local/bin/python3 /usr/local/bin/python
+#
+#---------------------------------------------------
+
+# Compilers and flags
+
+FC  = mpif90 -I$(GACODE_ROOT)/modules -J$(GACODE_ROOT)/modules -fPIC -framework Accelerate
+F77 = mpif77 -std=legacy
+CC  = ${FC}
+
+GOMPTEST := $(shell ${CC} -v 2>&1 | grep " version " | grep gcc >/dev/null; echo $$?)
+ifeq ($(GOMPTEST),0)
+  FOMP  =-fopenmp
+endif
+
+FMATH	=-fdefault-real-8 -fdefault-double-8 
+FOPT	=-O3 
+FDEBUG  =-Wall -fcheck=all -ffpe-trap=invalid,zero,overflow -g -fbacktrace
+F2PY    = f2py
+
+# System math libraries
+
+LMATH = /opt/homebrew/lib/libfftw3.a
+FFTW_INC = /opt/homebrew/include 
+
+ifdef FANN_ROOT
+   # neural net libraries
+   NN_LIB=-L$(GACODE_ROOT)/../neural/ -I$(GACODE_ROOT)/../neural/ -lbrainfuse -lfann
+endif
+
+# NetCDF libraries
+
+NETCDF = -L/opt/homebrew/lib -lnetcdff -L/opt/homebrew/lib -Wl,-headerpad_max_install_names -lnetcdf
+NETCDF_INC = /opt/homebrew/lib
+
+# Archive
+
+ARCH = ar cr

platform/exec/exec.OSX_SONOMA_M3

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+#!/bin/sh
+# GACODE Parallel execution script (OSX_MONTEREY)
+#
+# NOTES:
+# Used openmpi, so use mpirun rather than mpiexec
+
+simdir=${1}
+nmpi=${2}
+exec=${3}
+nomp=${4}
+numa=${5}
+mpinuma=${6}
+
+echo $simdir
+
+cd $simdir
+export OMP_NUM_THREADS=$nomp 
+mpirun -np $nmpi $exec