Linking target: nrf51822_xxac_s110.out
_build/main.o: In function `gap_params_init':
/home/code/nRF51822/adc-test/nrf51_breakout/s110/armgcc/../../../main.c:125: undefined reference to `app_timer_evt_schedule'
collect2: error: ld returned 1 exit status
Makefile:163: recipe for target 'nrf51822_xxac_s110' failed
make: *** [nrf51822_xxac_s110] Error 1