arm里面c程序编译问题

arm里面用arm-gcc编译log（R/21），加了#include了但是报错

lh@ubuntu:~/opt/FriendlyARM/mini2451/examples/adc-test$ vi adc-test.c
lh@ubuntu:~/opt/FriendlyARM/mini2451/examples/adc-test$ make
arm-linux-gcc adc-test.c -Wall -O2 -o adc-test
/tmp/cc0sAjer.o: In function main':
adc-test.c:(.text+0xe8): undefined reference tolog'
collect2: ld returned 1 exit status

make: * [adc-test] 错误 1
大神们指点一二