HAVE_TYPE_STRUCT_IP_MREQ  687 ext/socket/option.c #if defined(IPPROTO_IP) && defined(HAVE_TYPE_STRUCT_IP_MREQ) /* 4.4BSD, GNU/Linux */
HAVE_TYPE_STRUCT_IP_MREQ  737 ext/socket/option.c #if defined(IPPROTO_IP) && defined(HAVE_TYPE_STRUCT_IP_MREQ) /* 4.4BSD, GNU/Linux */