compile kernel error under Cygwin

[loody]

Dear all:
I patch my kernel with the code below.

#ifdef __CYGWIN__
#include <libelf.h>
#else
#include <elf.h>
#endif

and I cross compile it with mips toolchain.
But I get the error message below:
 gcc -Wp,-MD,scripts/mod/.mk_elfconfig.d -Wall -Wstrict-prototypes -O2
-fomit-frame-pointer      -o scripts/mod/mk_elfconfig
scripts/mod/mk_elfconfig.c
scripts/mod/mk_elfconfig.c:5:20: error: libelf.h: No such file or directory

it seems I have no libelf.h.
Does that mean I forget to install some packages under cygwin?
appreciate your help,
miloody

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