Please help me with the arch.make file modification for Siesta 4.1-b4 parallel mode.

### This is the standard arch.make file that I have.

.SUFFIXES:
.SUFFIXES: .f .F .o .c .a .f90 .F90

SIESTA_ARCH = unknown

#CC = gcc
#FPP = $(FC) -E -P -x c
#FC = gfortran
#FC_SERIAL = gfortran

#FFLAGS = -O2 -fPIC -ftree-vectorize

CC = mpicc
FC = mpifort # or mpif90
MPI_INTERFACE = libmpi_f90.a
MPI_INCLUDE = .
FPPFLAGS += -DMPI

AR = ar
RANLIB = ranlib

SYS = nag

SP_KIND = 4
DP_KIND = 8
KINDS = $(SP_KIND) $(DP_KIND)

LDFLAGS =

COMP_LIBS = libsiestaLAPACK.a libsiestaBLAS.a

FPPFLAGS = $(DEFS_PREFIX)-DFC_HAVE_ABORT

LIBS =

# Dependency rules ---------

FFLAGS_DEBUG = -g -O1 # your appropriate flags here...

# The atom.f code is very vulnerable. Particularly the Intel compiler
# will make an erroneous compilation of atom.f with high optimization
# levels.
atom.o: atom.F
 $(FC) -c $(FFLAGS_DEBUG) $(INCFLAGS) $(FPPFLAGS) $(FPPFLAGS_fixed_F) $<

.c.o:
 $(CC) -c $(CFLAGS) $(INCFLAGS) $(CPPFLAGS) $<
.F.o:
 $(FC) -c $(FFLAGS) $(INCFLAGS) $(FPPFLAGS) $(FPPFLAGS_fixed_F) $<
.F90.o:
 $(FC) -c $(FFLAGS) $(INCFLAGS) $(FPPFLAGS) $(FPPFLAGS_free_F90) $<
.f.o:
 $(FC) -c $(FFLAGS) $(INCFLAGS) $(FCFLAGS_fixed_f) $<
.f90.o:
 $(FC) -c $(FFLAGS) $(INCFLAGS) $(FCFLAGS_free_f90) $<