[ntp:questions] disabling USE_UDP_SIGPOLL for an additional OS

[loretta_1958 at yahoo.com]

I am porting ntp to LynxOS, and got an error upon attempting to start ntpd:   init_socket_sig:ioctl(I_SET_SIG, S_INPUT) failed
 
I see that bug 1131 addressed this for another OS.  I have verified by updating the config.h file, that removing the #define USE_UDP_SIGPOLL 1, will take care of the problem.  What I haven't been able to determine is how to update the configure.ac file to remove this define.
 
I thought the change below would take care of it, but it did not.
I am invoking configure as follows:  ./configure --host i386-elf-lynxos . . .
--------------------------
 
AC_CACHE_CHECK(if we can use SIGPOLL for UDP I/O, ac_cv_var_use_udp_sigpoll,
[ans=no
case "$ac_cv_hdr_def_sigpoll" in
 yes)
    case "$host" in
     mips-sgi-irix*)
 ans=no
 ;;
     vax-dec-bsd)
        ans=no
        ;;
     *-pc-cygwin*)
 ans=no
 ;;
     *-sni-sysv*)
        ans=no
        ;;
     *-*-aix[[45]]*)
        ans=no
        ;;
     *-*-hpux*)
        ans=no
        ;;
     *-*-linux*)
 ans=no
 ;;
     *-*-lynxos*)
 ans=no
 ;;
     *-*-osf*)
        ans=no
        ;;
     *-*-qnx*)
        ans=no
        ;;
     *-*-sunos*)
 ans=no
 ;;
     *-*-ultrix*)
        ans=no
        ;;
     *-*-unicosmp*)
        ans=no
        ;;
     *) ans=yes
        ;;
    esac
    ;;
esac
ac_cv_var_use_udp_sigpoll=$ans])
case "$ac_cv_var_use_udp_sigpoll" in
 yes) AC_DEFINE(USE_UDP_SIGPOLL, 1, [Can we use SIGPOLL for UDP?]) ;;
esac

--
Thanks,
Loretta