(...)
LD rockbox.elf
/home/doc/Downloads/rockbox-489fad0/build/apps/iap.o: In function `iap_handlepkt':
iap.c:(.text+0x16b4): undefined reference to `rmt_tuner_freq'
iap.c:(.text+0x16c0): undefined reference to `rmt_tuner_rds_data'
iap.c:(.text+0x16f0): undefined reference to `radio_present'
collect2: ld returned 1 exit status
make: *** [/home/doc/Downloads/rockbox-489fad0/build/rockbox.elf] Error 1