emerge-rowan chromeos-ec
I got
/build/rowan/tmp/portage/chromeos-base/chromeos-ec-0.0.1-r4771/work/chromeos-ec-0.0.1/platform/ec/driver/accelgyro_bmi160.c:1296: undefined reference to `sensor_init_done'
collect2: error: ld returned 1 exit status
make[1]: *** [Makefile.rules:353: build/rowan/utils/RO/utils.RO.elf] Error 1
make[1]: *** Waiting for unfinished jobs....
build/rowan/utils_str/RO/driver/accelgyro_bmi160.o: In function `init':
/build/rowan/tmp/portage/chromeos-base/chromeos-ec-0.0.1-r4771/work/chromeos-ec-0.0.1/platform/ec/driver/accelgyro_bmi160.c:1296: undefined reference to `sensor_init_done'
collect2: error: ld returned 1 exit status
make[1]: *** [Makefile.rules:353: build/rowan/utils_str/RO/utils_str.RO.elf] Error 1
make[1]: *** Waiting for unfinished jobs....
build/rowan/utils_str/RW/driver/accelgyro_bmi160.o: In function `init':
/build/rowan/tmp/portage/chromeos-base/chromeos-ec-0.0.1-r4771/work/chromeos-ec-0.0.1/platform/ec/driver/accelgyro_bmi160.c:1296: undefined reference to `sensor_init_done'
collect2: error: ld returned 1 exit status
  HOSTCC  util/ectool
make[1]: *** [Makefile.rules:348: build/rowan/utils_str/RW/utils_str.RW.elf] Error 1
build/rowan/utils/RW/driver/accelgyro_bmi160.o: In function `init':
/build/rowan/tmp/portage/chromeos-base/chromeos-ec-0.0.1-r4771/work/chromeos-ec-0.0.1/platform/ec/driver/accelgyro_bmi160.c:1296: undefined reference to `sensor_init_done'
collect2: error: ld returned 1 exit status
make[1]: *** [Makefile.rules:348: build/rowan/utils/RW/utils.RW.elf] Error 1
make: *** [Makefile.rules:205: test-utils_str] Error 2
make: *** [Makefile.rules:205: test-utils] Error 2