+have_sendmsg="no"
+case $host_os in
+linux*)
+ AC_SEARCH_LIBS(sendmsg, socket, [have_sendmsg="yes"], [have_sendmsg="no"])
+ ;;
+esac
+
+case x$have_sendmsg in
+xyes)
+ AC_DEFINE([HAVE_SENDMSG],1,[Define if your platform supports sendmsg])
+ ;;
+esac
+