I got this mnake error :
  CC      init/version.o
  LD      init/built-in.o
  LD      .tmp_vmlinux1
drivers/built-in.o: In function `litelink_open':
litelink-sir.c:(.text+0xd7111): undefined reference to `sirdev_set_dtr_rts'
drivers/built-in.o: In function `litelink_close':
litelink-sir.c:(.text+0xd7157): undefined reference to `sirdev_set_dtr_rts'
drivers/built-in.o: In function `litelink_change_speed':
litelink-sir.c:(.text+0xd71ac): undefined reference to `sirdev_set_dtr_rts'
litelink-sir.c:(.text+0xd71d2): undefined reference to `sirdev_set_dtr_rts'
drivers/built-in.o: In function `litelink_reset':
litelink-sir.c:(.text+0xd724e): undefined reference to `sirdev_set_dtr_rts'
drivers/built-in.o:litelink-sir.c:(.text+0xd7271): more undefined references to
`sirdev_set_dtr_rts' follow
drivers/built-in.o: In function `toim3232_change_speed':
toim3232-sir.c:(.text+0xd74bd): undefined reference to `sirdev_raw_write'
drivers/built-in.o: In function `toim3232_reset':
toim3232-sir.c:(.text+0xd7540): undefined reference to `sirdev_set_dtr_rts'
toim3232-sir.c:(.text+0xd756c): undefined reference to `sirdev_set_dtr_rts'
drivers/built-in.o: In function `litelink_sir_init':
litelink-sir.c:(.init.text+0x6dbb): undefined reference to `irda_register_dongle'
drivers/built-in.o: In function `toim3232_sir_init':
toim3232-sir.c:(.init.text+0x6df7): undefined reference to `irda_register_dongle'
drivers/built-in.o: In function `litelink_sir_cleanup':
litelink-sir.c:(.exit.text+0x67b): undefined reference to `irda_unregister_dongle'
drivers/built-in.o: In function `toim3232_sir_cleanup':
toim3232-sir.c:(.exit.text+0x69b): undefined reference to `irda_unregister_dongle'
make: *** [.tmp_vmlinux1] Error 1