+#
+# Check for struct ip_mreqn
+#
+AC_MSG_CHECKING(for struct ip_mreqn)
+AC_TRY_COMPILE([#include <netinet/in.h>], [
+ struct ip_mreqn mreq;
+ mreq.imr_address.s_addr = 0;
+], [
+ # Yes, we have it...
+ AC_MSG_RESULT(yes)
+ AC_DEFINE([HAVE_STRUCT_IP_MREQN],[],[Support for struct ip_mreqn])
+], [
+ # We'll just have to try and use struct ip_mreq
+ AC_MSG_RESULT(no)
+ AC_MSG_CHECKING(for struct ip_mreq)
+ AC_TRY_COMPILE([#include <netinet/in.h>], [
+ struct ip_mreq mreq;
+ mreq.imr_interface.s_addr = 0;
+ ], [
+ # Yes, we have it...
+ AC_MSG_RESULT(yes)
+ AC_DEFINE([HAVE_STRUCT_IP_MREQ],[],[Support for struct ip_mreq])
+ ], [
+ # No multicast support
+ AC_MSG_RESULT(no)
+ ])
+])
+