Output Message: "...A host pointer is provided without also specifying one of..."

I am not really sure if I understand what you are trying to do with that code. Are you trying to pass two values (rather than buffers) to the kernel? If that is the case, just pass them as values, no need to define pointers and allocate buffers.

uint init = 0;
int size = SIZE;
status = clSetKernelArg(well_kernel, 4, sizeof(uint), (void *) &init);
checkError(status, "Failed to set kernel arg 4");
status = clSetKernelArg(well_kernel, 5, sizeof(int), (void *) &size);
checkError(status, "Failed to set kernel arg 5");