golang.org/x/sys build error

[visualfc]

https://github.com/golang/sys/blob/493d1725989a7a3f3582adfa68faf7207aec666b/unix/syscall_darwin.go#L25

func fdopendir(fd int) (dir uintptr, err error) {
	r0, _, e1 := syscall_syscallPtr(libc_fdopendir_trampoline_addr, uintptr(fd), 0, 0)
	dir = uintptr(r0)
	if e1 != 0 {
		err = errnoErr(e1)
	}
	return
}

var libc_fdopendir_trampoline_addr uintptr

//go:cgo_import_dynamic libc_fdopendir fdopendir "/usr/lib/libSystem.B.dylib"