}
	wantAccept4 := err != syscall.ENOSYS
	gotAccept4 := unix.SupportAccept4()
	if wantAccept4 != gotAccept4 {
		t.Fatalf("SupportAccept4, got %t; want %t", gotAccept4, wantAccept4)
	}

	// Test that the version returned by KernelVersion matches expectations.
	major, minor := unix.KernelVersion()
	t.Logf("Kernel version: %d.%d", major, minor)
	if runtime.GOOS == "illumos" {
		if gotSock && gotAccept4 && (major < 5 || (major == 5 && minor < 11)) {