IPPROTO_IPV6      673 contrib/build-mca-comps-outside-of-tree/btl_tcp2_component.c             if (setsockopt (sd, IPPROTO_IPV6, IPV6_V6ONLY,
IPPROTO_IPV6      937 opal/mca/btl/tcp/btl_tcp_component.c             if (setsockopt (sd, IPPROTO_IPV6, IPV6_V6ONLY,