Minor Updates in Make structure

Build/Makefile.Macosx

+CC       =  icc
+CXX      =  g++-11
+
+MPICC    =  mpicc
+MPIC++   =  mpiCC
+
+FFTW_INCL=  -I/usr/local/include
+FFTW_LIB=  -L/usr/local/lib/
+
+GSL_INCL =
+GSL_LIBS =
+
+MPI_LIB =
+MPI_INCL= -I/home/taffoni/sw/Linux_x86_64/21.5/comm_libs/mpi/include
+HDF5_INCL =
+HDF5_LIB  =
+
+OMP= -fopenmp
+
+NVCC = nvcc
+NVFLAGS = -arch=sm_70 -Xcompiler -mno-float128 -std=c++11
+NVLIB = -L/home/taffoni -lcudart -lcuda
+
+CFLAGS +=  -I. $(FFTW_INCL) $(GSL_INCL) $(MPI_INCL)
+
+OPTIMIZE = $(OMP) -O3