dnl check for in_port_t definition
 AC_MSG_CHECKING([whether in_port_t is defined])
 AC_TRY_COMPILE([
 #include <sys/types.h>
 #include <netinet/in.h>
 ],
 [in_port_t pt; pt = 0; return pt;],
 [
     AC_MSG_RESULT(yes)
     AC_DEFINE([HAVE_IN_PORT_T],1,[in_port_t is defined])
 ],
 AC_MSG_RESULT(no))