AC_ARG_ENABLE([ipv6], [AS_HELP_STRING([--disable-ipv6], [do not include IPv6 support])], want_ipv6=$enableval, want_ipv6="yes") if test "$want_ipv6" = "yes" then AC_MSG_CHECKING([for IPv6 support]) AC_CACHE_VAL([have_cv_ipv6],[ AC_TRY_RUN([ #include <sys/types.h> #include <sys/socket.h> #include <netdb.h> #include <unistd.h> int main(int argc, char **argv) { struct addrinfo *res, hints; int sd; if((sd = socket(AF_INET6, SOCK_STREAM, 0)) < 0) return 1; close(sd); /* also check if getaddrinfo() handles AF_UNSPEC -- bb#1196 */ memset(&hints, 0, sizeof(hints)); hints.ai_family = AF_UNSPEC; if(getaddrinfo("127.0.0.1", NULL, &hints, &res) < 0) return 1; freeaddrinfo(res); return 0; } ], [have_cv_ipv6=yes], [have_cv_ipv6=no], [have_cv_ipv6=no]) ]) AC_MSG_RESULT([$have_cv_ipv6]) if test "$have_cv_ipv6" = yes; then AC_DEFINE(SUPPORT_IPv6, 1, [Support for IPv6]) fi fi