An error during compiling

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i select "small C library" and "reduced device drivers" options

i encounter two questions while compiling

1)i can&#39;t use the fopen function,the error msg during compiling:

obj/count_binary.o(.text+0x98): In function `main&#39;:

../count_binary.c:22: undefined reference to `fopen

collect2: ld returned 1 exit status

make: *** [count_binary_3.elf] Error 1

Build completed[/b]

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I guess you shouldn&#39;t enable small C library property if you want to use &#39;fopen&#39;.

FYI.

regards,

David