+printf "Checking if a TCP deferring mechanism is available... ";
+if (test_file($config{CC}, "tcp_defer_accept.cpp")) {
+ $config{HAS_DEFER} = "TCP_DEFER_ACCEPT";
+ print "yes (TCP_DEFER_ACCEPT)\n";
+} elsif (test_file($config{CC}, "so_acceptfilter.cpp")) {
+ $config{HAS_DEFER} = "SO_ACCEPTFILTER";
+ print "yes (SO_ACCEPTFILTER)\n";
+} else {
+ $config{HAS_DEFER} = "false";
+ print "no\n";
+}
+