Failed to build arm64 goldfish kernel on Mac OS X

I have add the elf.h. Build failed to build the vdso.

CC arch/arm64/kernel/signal.o
In file included from arch/arm64/kernel/signal.c:36:0:
arch/arm64/kernel/signal.c: In function 'setup_return':
./arch/arm64/include/asm/vdso.h:34:11: error: 'vdso_offset_sigtramp' undeclared (first use in this function)
(void *)(vdso_offset_##name - VDSO_LBASE + (unsigned long)(base)); \
^
arch/arm64/kernel/signal.c:245:14: note: in expansion of macro 'VDSO_SYMBOL'
sigtramp = VDSO_SYMBOL(current->mm->context.vdso, sigtramp);
^
./arch/arm64/include/asm/vdso.h:34:11: note: each undeclared identifier is reported only once for each function it appears in
(void *)(vdso_offset_##name - VDSO_LBASE + (unsigned long)(base)); \
^
arch/arm64/kernel/signal.c:245:14: note: in expansion of macro 'VDSO_SYMBOL'
sigtramp = VDSO_SYMBOL(current->mm->context.vdso, sigtramp);
^
make[1]: *** [arch/arm64/kernel/signal.o] Error 1
make: *** [arch/arm64/kernel] Error 2

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