Why can't I compile HelloWorld ?

[1xx]

Hi all!

I started gcc for the first time in one month.
I have noticed that the compiler does not operate correctly.

$ cat hello.c

#include <stdio.h>

int
main(void)
{
        printf("hello!\n");
        return 0;
}


$export LANG=C
$ gcc hello.c
/usr/lib/gcc/i686-pc-cygwin/4.5.3/../../../libcygwin.a(libcmain.o): In
function `main':
/usr/src/debug/cygwin-1.7.17-1/winsup/cygwin/lib/libcmain.c:39:
undefined reference to `_WinMain@16'
collect2: ld returned 1 exit status


I was able to compile the more complicated program one month ago.
Why can't I compile?
What should I do in order to compile Hello World again?



Operating System: Windows 7 Ultimate 64-bit (6.1, Build 7601) Service
Pack 1 (7601.win7sp1_gdr.130104-1431)
           Language: Japanese (Regional Setting: Japanese)
System Manufacturer: Dell Inc.
       System Model: XPS 8300
               BIOS: BIOS Date: 03/28/12 09:12:57 Ver: 04.06.04
          Processor: Intel(R) Core(TM) i7-2600 CPU @ 3.40GHz (8 CPUs), ~3.4GHz
             Memory: 16384MB RAM
Available OS Memory: 16366MB RAM
https://dl.dropboxusercontent.com/u/86335040/openSUSE/DxDiag13.txt


See also http://d.hatena.ne.jp/Itisango/20130420/1366424497


Thanks .


--
1xx <itsa...@gmail.com> <https://twitter.com/ItSANgo>
<http://d.hatena.ne.jp/Itisango/>

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