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HelloWorld on Skyeye,新手请进!

为什么我运行楼主的这个程序没问题,而自己编译其他的就都有问题啊
问题都是一样的,如下是ucos_test产生的错误消息
+ linking o file ... : start.o at91_aic.o at91_usart.o at91_tc.o at91_init.o sk yeye_stdio.o skyeye_printf.o main_entry.o -> simple_test.elf
arm-elf-ld -p -X -T../../samples/samples.lds start.o --start-group ../ulib/libu c.a at91_aic.o at91_usart.o at91_tc.o at91_init.o skyeye_stdio.o skyeye_printf. o main_entry.o --end-group -o simple_test.elf
skyeye_printf.o: In function `getnum':
/home/skyeye-projects/ucosii4skyeye/samples/simple_test/../../lib/skyeye_printf .c:110: undefined reference to `isdigit'
skyeye_printf.o: In function `skyeye_printf':
/home/skyeye-projects/ucosii4skyeye/samples/simple_test/../../lib/skyeye_printf .c:156: undefined reference to `isdigit'
make: *** [simple_test.elf] 错误 1

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