Problem

interface.c: In function 'ife_print_long':
interface.c:666: error: 'ARPHRD_CSLIP' undeclared (first use in this function)
interface.c:666: error: (Each undeclared identifier is reported only once
interface.c:666: error: for each function it appears in.)
interface.c:666: error: 'ARPHRD_CSLIP6' undeclared (first use in this function)

Answer

Symbol: SLIP [=n]
Type  : tristate
Prompt: SLIP (serial line) support
  Defined at drivers/net/slip/Kconfig:5
  Depends on: NETDEVICES [=y]
  Location:  
    -> Device Drivers
      -> Network device support (NETDEVICES [=y])

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