Looks like standard network library functions that are not being included. They appear to be part of the Ethernet library. Are you including <Ethernet.h>? If so you might also have to include <Ethernet/util.h>.
Looks like standard network library functions that are not being included. They appear to be part of the Ethernet library. Are you including <Ethernet.h>? If so you might also have to include <Ethernet/util.h>.