D      drivers/net/bonding/built-in.o
  CC      drivers/net/plip.o
  CC      drivers/net/sky2.o
drivers/net/sky2.c: In function ‘sky2_rx_add’:
drivers/net/sky2.c:901: warning: implicit declaration of function ‘upper_32_bits’
drivers/net/sky2.c: In function ‘sky2_xmit_frame’:
drivers/net/sky2.c:1436: warning: implicit declaration of function ‘ip_hdrlen’
drivers/net/sky2.c:1436: warning: implicit declaration of function ‘tcp_hdrlen’
drivers/net/sky2.c:1471: warning: implicit declaration of function ‘skb_transport_offset’
drivers/net/sky2.c:1478: warning: implicit declaration of function ‘ip_hdr’
drivers/net/sky2.c:1478: error: invalid type argument of ‘->’
drivers/net/sky2.c: In function ‘receive_copy’:
drivers/net/sky2.c:2009: warning: implicit declaration of function ‘skb_copy_from_linear_data’
make[2]: *** [drivers/net/sky2.o] Error 1
make[1]: *** [drivers/net] Error 2
make: *** [drivers] Error 2