GCC compile err ??

[bbaa aaa]

We have Redhar As 2.1 update3.  I tried to use "gcc" to compile a simple C 
program and have error.  Does anyone know why?

Thanks.

%gcc shell.c
/usr/lib/gcc-lib/i386-redhat-linux/2.96/../../../crt1.o: In function 
`_start':
/usr/lib/gcc-lib/i386-redhat-linux/2.96/../../../crt1.o(.text+0x18): 
undefined reference to `main'
collect2: ld returned 1 exit status

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