drivers/net/usb/lan78xx.c:2632:26: error: variable has incomplete type 'struct fixed_phy_status' drivers/net/usb/lan78xx.c:2641:9: error: call to undeclared function 'fixed_phy_register'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration] drivers/net/usb/lan78xx.c:2837:5: error: call to undeclared function 'fixed_phy_unregister'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration] drivers/net/usb/lan78xx.c:2871:3: error: call to undeclared function 'fixed_phy_unregister'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration] drivers/net/usb/lan78xx.c:4583:3: error: call to undeclared function 'fixed_phy_unregister'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]