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	EXEC=gbs_gradients # Excutable name
	# on izar
	#FC=gfortran # GNU Fortran compiler
	#FC=nvfortran # NVHPC Fortran compiler
	FC=ftn
	#
	#FLAGS= -O3 -fopenmp -foffload=-lgfortran -lm -foffload="-lm" # options for OpenMP with GNU
	#FLAGS= -O3 -static-nvidia -mp=gpu -gpu=cc70 -Minfo=mp # options for openMP with NVHPC
	#FLAGS=-O3 -acc -gpu=cc70 # options for openACC with NVHPC
	#FLAGS=-O3 -homp -hnoacc # OpenMP with ftn on piz-daint
	FLAGS=-O3 -acc -Minfo # OpenACC with pgi on piz-daint
	#
	CUDAC=nvcc # CUDA C compiler
	CUDAFLAGS= -O3 # options for CUDA C
	CUDA=CUDA
	#
	all: $(EXEC)

	gbs_gradients: test_gbs_gradients.F90 gradients_mod.F90 space_grid_mod.F90 prec_const_mod.F90
	$(FC) $(FLAGS) prec_const_mod.F90 space_grid_mod.F90 gradients_mod.F90 test_gbs_gradients.F90 -o $(EXEC)
	gbs_gradients_cuda: fortranfiles.o cudafiles.o fortranmain.o
	$(CUDAC) -o $(EXEC) $(CUDAFLAGS) -D$(CUDA) -lgfortran -lcuda test_gbs_gradients.o gradients_mod.o gradients_cuda_mod.o gradients_fd4.o space_grid_mod.o prec_const_mod.o cuda_memory.o
	fortranmain.o: test_gbs_gradients.F90
	$(FC) -c $(FLAGS) -D$(CUDA) test_gbs_gradients.F90
	fortranfiles.o: gradients_mod.F90 space_grid_mod.F90 prec_const_mod.F90
	$(FC) -c $(FLAGS) -D$(CUDA) prec_const_mod.F90 space_grid_mod.F90 gradients_mod.F90 gradients_cuda_mod.F90
	cudafiles.o: cuda_memory.cu
	$(CUDAC) $(CUDAFLAGS) -c cuda_memory.cu gradients_fd4.cu
	clean:
	rm -f gbs_gradients gbs_gradients_cuda .mod .o *~