IPV6_ROUTER_ALERT_ISOLATE looks too recent for test env
@@ -835,7 +835,6 @@ pub const IPV6_V6ONLY: ::c_int = 26;
pub const IPV6_JOIN_ANYCAST: ::c_int = 27;
pub const IPV6_LEAVE_ANYCAST: ::c_int = 28;
pub const IPV6_MULTICAST_ALL: ::c_int = 29;
-pub const IPV6_ROUTER_ALERT_ISOLATE: ::c_int = 30;
pub const IPV6_RECVPKTINFO: ::c_int = 49;
pub const IPV6_PKTINFO: ::c_int = 50;
pub const IPV6_RECVTCLASS: ::c_int = 66;
