xref: /freebsd-11.0-release/contrib/ntp/configure.ac

dnl NTP top-level configure.ac				-*- Autoconf -*-
dnl
m4_include([sntp/m4/version.m4])
AC_PREREQ([2.61])
AC_INIT(
    [ntp],
    [VERSION_NUMBER],
    [http://bugs.ntp.org./],
    [],
    [http://www.ntp.org./]dnl
)
AC_CONFIG_MACRO_DIR([sntp/m4])
AC_CONFIG_AUX_DIR([sntp/libevent/build-aux])
AC_LANG([C])

AC_PRESERVE_HELP_ORDER

# Bump ntp_configure_cache_version for each change to configure.ac or
# .m4 files which invalidates cached values from previous configure 
# runs.
#
# If the change affects cache variables used only by the main NTP
# configure.ac, then only its version number should be bumped, while
# the subdir configure.ac version numbers should be unchanged.  The
# same is true for a test/variable that is used only by one subdir
# being changed incompatibly; only that subdir's cache version needs
# bumping.
#
# If a change affects variables shared by all NTP configure scripts,
# please bump the version numbers of each.  If you are not sure, the
# safe choice is to bump all on any cache-invalidating change.
#
# In order to avoid the risk of version stamp collision between -stable
# and -dev branches, do not simply increment the version, instead use
# the date YYYYMMDD optionally with -HHMM if there is more than one
# bump in a day.

ntp_configure_cache_version=20120806

# When the cache version of config.cache and configure do not
# match, NTP_CACHEVERSION will flush the cache.

NTP_CACHEVERSION([main], [$ntp_configure_cache_version])

AM_INIT_AUTOMAKE([1.10 foreign -Wall -Wno-gnu])

dnl AM_SILENT_RULES req. automake 1.11.  [yes] defaults V=0
m4_ifdef(
    [AM_SILENT_RULES],
    [AM_SILENT_RULES([yes])]
)
AC_CANONICAL_BUILD
AC_CANONICAL_HOST
dnl the 'build' machine is where we run configure and compile
dnl the 'host' machine is where the resulting stuff runs.
AC_DEFINE_UNQUOTED([STR_SYSTEM], ["$host"],
    [canonical system (cpu-vendor-os) of where we should run])
AC_CONFIG_HEADERS([config.h])
dnl AC_ARG_PROGRAM

ntp_atom_ok=${ntp_atom_ok=no}
ntp_oncore_ok=${ntp_oncore_ok=no}
ntp_parse_ok=${ntp_parse_ok=no}
ntp_ripe_ncc_ok=${ntp_parse_ok=no}
ntp_jupiter_ok=${ntp_jupiter_ok=no}

NTP_PROG_CC
NTP_COMPILER

dnl # Do we need CXX for anything besides google test?
dnl AC_PROG_CXX
AC_PROG_YACC
dnl AC_PROG_CC_C_O 	# called by NTP_COMPILER
AX_C99_STRUCT_INIT

NTP_HARDEN([sntp])

NTP_VPATH_HACK		dnl used only by ntpd/Makefile.am

NTP_LOCINFO([sntp])	dnl takes over from NTP_BINDIR, in NTP_LIBNTP

dnl AM_PROG_AR req. automake 1.12
m4_ifdef(
    [AM_PROG_AR],
    [AM_PROG_AR]
)

# So far, the only shared library we might use is libopts.
# It's a small library - we might as well use a static version of it.
AC_DISABLE_SHARED
AC_PROG_LIBTOOL
AC_SUBST([LIBTOOL_DEPS])

# NTP has (so far) been relying on leading-edge autogen, which
# means we need the appropriate corresponding libopts as well.
# Therefore, by default:
# - use the version of libopts we ship with
# - do not install it
# - build a static copy (AC_DISABLE_SHARED - done earlier)
case "${enable_local_libopts+set}" in
 set) ;;
 *) enable_local_libopts=yes ;;
esac
case "${enable_libopts_install+set}" in
 set) ;;
 *) enable_libopts_install=no ;;
esac
enable_nls=no
LIBOPTS_CHECK_NOBUILD([sntp/libopts])

NTP_LIBEVENT_CHECK_NOBUILD([2], [sntp/libevent])

NTP_LIBNTP

AC_MSG_CHECKING([for deprecated --with-arlib])
AC_ARG_WITH([arlib],
	AS_HELP_STRING([--with-arlib], [- deprecated, arlib not distributed]),
	[ans=$withval], [ans=no])
AC_MSG_RESULT([$ans])

case "$ans" in
 yes)
    AC_MSG_WARN([Please do not use --with-arlib, arlib is no longer included.  In the future, --with-arlib will not be recognized.])
    ;;
esac

dnl  we need to check for cross compile tools for vxWorks here
AC_PROG_AWK
AS_UNSET([ac_cv_prog_AWK])
AC_SUBST([AWK])				dnl scripts/ntpver.in
AC_PROG_MAKE_SET

AC_SUBST([CFLAGS])
AC_SUBST([LDFLAGS])

AC_PROG_LN_S
AC_ISC_POSIX


AC_PATH_PROG([PATH_PERL], [perl])
dnl  Saving cached hardcoded paths rather than searching $PATH during a
dnl  cached configure run is an optimization not worth the the cost of
dnl  preventing newly-installed tools from being found.  Short-circuit
dnl  the caching after the tests so preset overrides still work.
AS_UNSET([ac_cv_path_PATH_PERL])
AC_PATH_PROG([PATH_TEST], [test])
AS_UNSET([ac_cv_path_PATH_TEST])
test -z "$CONFIG_SHELL" && CONFIG_SHELL=/bin/sh
AC_SUBST([CONFIG_SHELL])		dnl for scripts #!/path/to/sh

AC_ARG_WITH(
    [net-snmp-config],
    [AS_HELP_STRING(
	[--with-net-snmp-config],
	[+ =net-snmp-config]
    )],
    [ans=$withval],
    [ans=yes]
)
case "$ans" in
 no)
    ;;
 yes)
    ans=net-snmp-config
    ;;
 /*)
    ;;
 */*)
    AC_MSG_ERROR([--with-net-snmp-config takes either a name or an absolute path])
    ;;
 *)
    ;;
esac
PROG_NET_SNMP_CONFIG=$ans
case "$PROG_NET_SNMP_CONFIG" in
 no) ;;
 /*)
    PATH_NET_SNMP_CONFIG=$PROG_NET_SNMP_CONFIG
    ;;
 *)
    AC_PATH_PROG([PATH_NET_SNMP_CONFIG], [$PROG_NET_SNMP_CONFIG])
    AS_UNSET([ac_cv_path_PATH_NET_SNMP_CONFIG])
;;
esac
AC_MSG_CHECKING([for net-snmp-config path])
AC_MSG_RESULT([$PATH_NET_SNMP_CONFIG])

case "$PATH_NET_SNMP_CONFIG" in
 /*)	AC_CACHE_CHECK(
	    [for net-snmp version],
	    [ntp_cv_net_snmp_version],
	    [ntp_cv_net_snmp_version=`$PATH_NET_SNMP_CONFIG --version`]
	)
	;;
esac

case "$host" in
 *-*-vxworks*)
    ac_link="$ac_link $VX_KERNEL"
    ;;
esac

# HMS: a check for -lnsl used to be here - now being done in NTP_LIBNTP
AC_SEARCH_LIBS([openlog], [gen syslog])
# XXX library list will be in ac_cv_search_openlog

# LIBSECCOMP is off by default -- needs testing with all the features
# Please send bug reports to loganaden@gmail.com
AC_MSG_CHECKING([if we want to use libseccomp sandboxing (EXPERIMENTAL)])
AC_ARG_ENABLE(
    [libseccomp],
    [AS_HELP_STRING(
	[--enable-libseccomp],
	[EXPERIMENTAL: enable support for libseccomp sandboxing (default is no) ]
    )],
    [ntp_ok=$enableval],
    [ntp_ok=no]
)
AC_MSG_RESULT([$ntp_ok])
case "$ntp_ok" in
 yes)
    AC_SEARCH_LIBS(
	[seccomp_init],
	[seccomp],
	[AC_DEFINE([LIBSECCOMP], [1],
	    [Define to any value to include libseccomp sandboxing.])]
    )
    AC_TRY_RUN([
	#include <stdio.h>
	#include <stdlib.h>
	#include <errno.h>
	#include <sys/prctl.h>
	#include <linux/seccomp.h>

	int main(void)
	{
		int ret;
		ret = prctl(PR_GET_SECCOMP, 0, 0, 0, 0);
		if (ret < 0) {
			switch (errno) {
			case ENOSYS:
				return 1;
			case EINVAL:
				return 1;
			default:
				return 1;
			}
		}
		ret = 
		prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, NULL, 0, 0);
		if (ret < 0) {
			switch (errno) {
			case EINVAL:
				return 1;
			case EFAULT:
				return 0;
			default:
				return 1;
		}
	}
return 1;
}
]
, AC_DEFINE([KERN_SECCOMP], 1, 
[Define to use libseccomp system call filtering.])   
, []
)
    ;;
esac

NTP_FACILITYNAMES

dnl Digital UNIX V4.0 and Solaris 7 have POSIX.1c functions in -lrt
dnl Solaris 2.6 only has -lposix4; in Solaris 7, this is a symlink to -lrt,
dnl so only use one of them.  Linux (glibc-2.1.2 and -2.2.2, at least)
dnl does Strange Things with extra processes using the Posix-compatibility
dnl real-time library, so we don't want to use it.
dnl
dnl 081118 Harlan got tired of looking for a way to get the sched*()
dnl functions to link OK with either cc or gcc.

case "$host" in
 *-*-*linux*) ;;
 *-*-osf4*) ;;
 *-*-osf5*) ;;
 *)
    # HMS: Make sure we check for -lrt for clock_* before this...
    case "$ac_cv_search_clock_gettime" in
     '') AC_MSG_ERROR([Internal Error: Haven't looked for clock_gettime() yet!]) ;;
    esac
    AC_SEARCH_LIBS([sched_setscheduler], [rt posix4])
    ;;
esac

AC_CHECK_HEADERS([bstring.h])
AC_CHECK_HEADER(
    [dns_sd.h],
    [AC_SEARCH_LIBS(
	[DNSServiceRegister],
	[dns_sd],
	[AC_DEFINE([HAVE_DNSREGISTRATION], [1],
	    [Use Rendezvous/DNS-SD registration])]
    )]
)
AC_CHECK_HEADERS([fcntl.h fnmatch.h ieeefp.h inttypes.h kvm.h math.h])

AC_CHECK_HEADERS([memory.h netdb.h poll.h])
AC_CHECK_HEADERS([sgtty.h stdatomic.h])
AC_HEADER_STDBOOL
AC_CHECK_HEADERS([stdlib.h string.h termio.h])
AC_CHECK_HEADERS([termios.h timepps.h timex.h unistd.h])

case "$host" in
 *-*-aix*)
    AC_CHECK_HEADERS([utmpx.h])
    case "$ac_cv_header_utmpx_h" in
     yes)
	;;
     *)
	AC_CHECK_HEADERS([utmp.h])
	;;
    esac
    ;;
 *)
    AC_CHECK_HEADERS([utmp.h utmpx.h])
    ;;
esac

#
# On Suns only (so far) getpass() truncates the typed password to 8
# characters, but getpassphrase() allows up to 257.  Most systems'
# getpass() does not truncate, at least not so as to affect ntpq and
# ntpdc password prompts.
#
# So check for getpassphrase(), but only on Sun operating systems.
#
case "$host" in
 *-*-sunos*|*-*-solaris*)
    AC_CHECK_FUNCS([getpassphrase])
esac


AC_CHECK_HEADERS([net/if6.h])
AC_CHECK_HEADERS([net/route.h], [], [], [
    #include <sys/types.h>
    #include <sys/socket.h>
    #include <net/if.h>
])

AC_CHECK_HEADERS([netinfo/ni.h])
case "$ac_cv_header_netinfo_ni_h" in
 yes)
    AC_DEFINE([HAVE_NETINFO], [1], [NetInfo support?])
esac
AC_CHECK_HEADERS([sun/audioio.h sys/audioio.h sys/file.h])
case "$host" in
 *-*-sunos4*)
    ;;
 *)
    AC_CHECK_HEADERS([sys/ioctl.h])
    ;;
esac
AC_CHECK_HEADERS([sys/ipc.h sys/lock.h sys/mman.h])
# HMS: Check sys/proc.h and sys/resource.h after some others
AC_CHECK_HEADERS([sys/modem.h sys/ppsclock.h sys/ppstime.h sched.h])
case "$ac_cv_header_sched_h" in
 yes)
    ;;
 *)
    AC_CHECK_HEADERS([sys/sched.h])
    ;;
esac
# HMS: Check sys/shm.h after some others
AC_CHECK_HEADERS([sys/select.h sys/signal.h sys/sockio.h])
# HMS: Checked sys/socket.h earlier
case "$host" in
 *-*-netbsd*)
    ;;
 *)
    AC_CHECK_HEADERS([machine/soundcard.h sys/soundcard.h])
    ;;
esac
AC_CHECK_HEADERS([sys/stat.h sys/stream.h stropts.h sys/stropts.h sys/syssgi.h])
AC_CHECK_HEADERS([sys/systune.h sys/termios.h sys/tpro.h sys/wait.h])
case "$host" in
*-convex-*)
    AC_CHECK_HEADERS([/sys/sync/queue.h /sys/sync/sema.h])
    ;;
*-*-bsdi*)
    AC_CHECK_HEADERS([machine/inline.h sys/pcl720.h sys/i8253.h])
    ;;
esac

case "$ac_cv_header_stdatomic_h" in
 yes)
	AC_CHECK_FUNCS([atomic_thread_fence])
	AC_CACHE_CHECK(
	    [for atomic_thread_fence()],
	    [ntp_cv_func_atomic_thread_fence],
	    [AC_COMPILE_IFELSE(
		[AC_LANG_PROGRAM(
		    [[
			#include <stdatomic.h>
		    ]],
		    [[
			atomic_thread_fence(memory_order_seq_cst);
		    ]]
		)]
		[ntp_cv_func_atomic_thread_fence=yes],
		[ntp_cv_func_atomic_thread_fence=no]
	    )]
	)
    ;;
esac

case "$host" in
 *-*-solaris2.6)
    # Broken...
    ;;
 *)
    AC_CHECK_FUNCS([ntp_adjtime ntp_gettime])
    ;;
esac

case "$host" in
 *-*-*linux*)
    case "$ac_cv_func_ntp_gettime" in
     yes)
	;;
     *)
	AC_CHECK_FUNCS([__ntp_gettime])
	case "$ac_cv_func___ntp_gettime" in
	 yes)
	    AC_DEFINE([ntp_gettime], [__ntp_gettime], [deviant])
		    AC_DEFINE([HAVE_NTP_GETTIME], [1], [via __ntp_gettime])
	esac
	;;
    esac
    AC_CHECK_FUNCS([adjtimex])
    case "$ac_cv_func_adjtimex" in
     yes)
	AC_DEFINE([ntp_adjtime], [adjtimex], [deviant])
	AC_DEFINE([HAVE_NTP_ADJTIME], [1], [via adjtimex])
	have_adjtimex=1
	;;
     *)
	AC_CHECK_FUNCS([__adjtimex])
	case "$ac_cv_func___adjtimex" in
	 yes)
	    AC_DEFINE([ntp_adjtime], [__adjtimex], [deviant])
	    AC_DEFINE([HAVE_NTP_ADJTIME], [1], [via __adjtimex])
	    AC_DEFINE([adjtimex], [__adjtimex], [deviant])
	    AC_DEFINE([HAVE_ADJTIMEX], [1], [via __adjtimex])
	    have_adjtimex=1
	esac
	;;
    esac
esac
case "$have_adjtimex" in
 '')
    # nlist stuff is only needed for tickadj.
    saved_LIBS="$LIBS"
    LIBS=
    AC_SEARCH_LIBS([nlist], [elf ld mld])
    # XXX ac_cv_search_nlist will be 'none required', 'no', or '-l...'
    AC_SEARCH_LIBS([kvm_open], [kvm])	dnl We already know about -lelf here...
    # XXX ac_cv_search_kvm_open will be 'none required', 'no', or '-l...'
    AC_CHECK_HEADERS([nlist.h sys/var.h])
    case "$ac_cv_header_nlist_h" in
     yes)
	AC_DEFINE([NLIST_STRUCT], [1], [nlist stuff])
	AC_CACHE_CHECK(
	    [for n_un in struct nlist],
	    [ntp_cv_struct_nlist_n_un],
	    [AC_COMPILE_IFELSE(
		[AC_LANG_PROGRAM(
		    [[
			#include <nlist.h>
		    ]],
		    [[
			struct nlist n;
			n.n_un.n_name = 0;
		    ]]
		)]
		[ntp_cv_struct_nlist_n_un=yes],
		[ntp_cv_struct_nlist_n_un=no]
	    )]
	)
	case "$ntp_cv_struct_nlist_n_un" in
	 yes)
	    AC_DEFINE([NLIST_NAME_UNION], [1],
		[does struct nlist use a name union?])
	esac
    esac
    AC_SUBST([LDADD_NLIST])
    LDADD_NLIST="$LIBS"
    LIBS="$saved_LIBS"
    AS_UNSET([saved_LIBS])
esac

AC_CHECK_HEADERS([sys/proc.h], [], [], [
    #ifdef HAVE_SYS_TYPES_H
    # include <sys/types.h>
    #endif
    #ifdef HAVE_SYS_TIME_H
    # include <sys/time.h>
    #endif
])

AC_CHECK_HEADERS([sys/resource.h], [], [], [
    #ifdef HAVE_SYS_TIME_H
    # include <sys/time.h>
    #endif
])

AC_CHECK_HEADERS([sys/shm.h], [], [], [
    #ifdef HAVE_SYS_TYPES_H
    # include <sys/types.h>
    #endif
    #ifdef HAVE_SYS_IPC_H
    # include <sys/ipc.h>
    #endif
])

AC_CHECK_HEADERS([sys/timex.h], [], [], [
    #ifdef HAVE_SYS_TIME_H
    # include <sys/time.h>
    #endif
])

AC_TYPE_SIGNAL
AC_TYPE_OFF_T
AC_STRUCT_TM	dnl defines TM_IN_SYS_TIME used by refclock_parse.c

AC_CACHE_CHECK(
    [for a fallback value for HZ],
    [ntp_cv_default_hz],
    [
	ntp_cv_default_hz=100
	case "$host" in
	 alpha*-dec-osf4*|alpha*-dec-osf5*)
	    ntp_cv_default_hz=1024
	    ;;
	 mips-dec-ultrix4*)
	    ntp_cv_default_hz=256
	    ;;
	esac
    ]
)
AC_DEFINE_UNQUOTED([DEFAULT_HZ], [$ntp_cv_default_hz],
    [What is the fallback value for HZ?])

AC_CACHE_CHECK(
    [if we need to override the system's value for HZ],
    [ntp_cv_override_hz],
    [
	ntp_cv_override_hz=no
	case "$host" in
	 alpha*-dec-osf4*|alpha*-dec-osf5*)
	    ntp_cv_override_hz=yes
	    ;;
	 mips-dec-ultrix4*)
	    ntp_cv_override_hz=yes
	    ;;
	 *-*-freebsd*)
	    ntp_cv_override_hz=yes
	    ;;
	 *-*-sunos4*)
	    ntp_cv_override_hz=yes
	    ;;
	 *-*-kfreebsd*)
	    ntp_cv_override_hz=yes
	    ;;
	esac
    ]
)
case "$ntp_cv_override_hz" in
 yes)
    AC_DEFINE([OVERRIDE_HZ], [1],
	[Do we need to override the system's idea of HZ?])
esac

dnl AC_CACHE_CHECK(ut_host in struct utmp, ac_cv_func_ut_host_in_utmp,
dnl [AC_TRY_LINK([#include <sys/types.h>
dnl #include <utmp.h>], [struct utmp ut; ut.ut_host;],
dnl ac_cv_func_ut_host_in_utmp=yes, ac_cv_func_ut_host_in_utmp=no)])
dnl if test $su_cv_func_ut_host_in_utmp = yes; then
dnl   AC_DEFINE(HAVE_UT_HOST)
dnl fi

dnl AC_MSG_CHECKING(if we can get the system boot time)
dnl AC_CACHE_VAL(su_cv_have_boot_time,
dnl [AC_EGREP_CPP(yes,
dnl [#ifdef HAVE_UTMPX_H
dnl #include <utmpx.h>
dnl #else
dnl #include <utmp.h>
dnl #endif
dnl #ifdef BOOT_TIME
dnl yes
dnl #endif
dnl ], su_cv_have_boot_time=yes, su_cv_have_boot_time=no)])
dnl AC_MSG_RESULT($su_cv_have_boot_time)

AC_CACHE_CHECK(
    [for struct rt_msghdr],
    [ntp_cv_struct_rt_msghdr],
    [AC_COMPILE_IFELSE(
	[AC_LANG_PROGRAM(
	    [[
		#include <sys/types.h>
		#include <sys/socket.h>
		#include <net/if.h>
		#include <net/route.h>
	    ]],
	    [[
		struct rt_msghdr p;
	    ]]
	)],
	[ntp_cv_struct_rt_msghdr=yes],
	[ntp_cv_struct_rt_msghdr=no]
    )]
)

AC_CACHE_CHECK(
    [for struct rtattr],
    [ntp_cv_rtattr],
    [AC_COMPILE_IFELSE(
	[AC_LANG_PROGRAM(
	    [[
		#include <stddef.h>
		#include <sys/socket.h>
		#include <linux/rtnetlink.h>
	    ]],
	    [[
		struct rtattr p;
	    ]]
	)],
	[ntp_cv_rtattr=yes],
	[ntp_cv_rtattr=no]
    )]
)

case "$ntp_cv_struct_rt_msghdr$ntp_cv_rtattr" in
 *yes*)
    AC_DEFINE([HAS_ROUTING_SOCKET], [1],
	[Do we have a routing socket (rt_msghdr or rtattr)?])
    case "$ntp_cv_rtattr" in
     yes)
	AC_DEFINE([HAVE_RTNETLINK], [1],
	    [Do we have Linux routing socket?])
    esac
esac

AC_CACHE_CHECK(
    [struct sigaction for sa_sigaction],
    [ntp_cv_struct_sigaction_has_sa_sigaction],
    [AC_COMPILE_IFELSE(
	[AC_LANG_PROGRAM(
	    [[
		#include <signal.h>
	    ]],
	    [[
		struct sigaction act;
		act.sa_sigaction = 0;
	    ]]
	)],
	[ntp_cv_struct_sigaction_has_sa_sigaction=yes],
	[ntp_cv_struct_sigaction_has_sa_sigaction=no]
    )]
)
case "$ntp_cv_struct_sigaction_has_sa_sigaction" in
 yes)
    AC_DEFINE([HAVE_SA_SIGACTION_IN_STRUCT_SIGACTION], [1], [Obvious])
esac

AC_CACHE_CHECK(
    [for struct ppsclockev],
    [ntp_cv_struct_ppsclockev],
    [AC_COMPILE_IFELSE(
	[AC_LANG_PROGRAM(
	    [[
		#ifdef HAVE_SYS_TYPES_H
		# include <sys/types.h>
		#endif
		#ifdef HAVE_SYS_TERMIOS_H
		# include <sys/termios.h>
		#endif
		#ifdef HAVE_SYS_TIME_H
		# include <sys/time.h>
		#endif
		#ifdef HAVE_SYS_PPSCLOCK_H
		# include <sys/ppsclock.h>
		#endif
	    ]],
	    [[
		extern struct ppsclockev *pce;
		return pce->serial;
	    ]]
	)],
	[ntp_cv_struct_ppsclockev=yes],
	[ntp_cv_struct_ppsclockev=no]
    )]
)
case "$ntp_cv_struct_ppsclockev" in
 yes)
    AC_DEFINE([HAVE_STRUCT_PPSCLOCKEV], [1],
	[Does a system header define struct ppsclockev?])
esac

case "$ac_cv_header_machine_soundcard_h$ac_cv_header_sys_soundcard_h" in
  *yes*)
    AC_CACHE_CHECK(
	[for struct snd_size],
	[ntp_cv_struct_snd_size],
	[AC_COMPILE_IFELSE(
	    [AC_LANG_PROGRAM(
		[[
		    #ifdef HAVE_MACHINE_SOUNDCARD_H
		    # include <machine/soundcard.h>
		    #endif
		    #ifdef HAVE_SYS_SOUNDCARD_H
		    # include <sys/soundcard.h>
		    #endif
		]],
		[[
		    extern struct snd_size *ss;
		    return ss->rec_size;
		]]
	    )],
	    [ntp_cv_struct_snd_size=yes],
	    [ntp_cv_struct_snd_size=no]
        )]
    )
    case "$ntp_cv_struct_snd_size" in
     yes)
	AC_DEFINE([HAVE_STRUCT_SND_SIZE], [1],
	    [Do we have struct snd_size?])
    esac
esac

AC_CACHE_CHECK(
    [struct clockinfo for hz],
    [ntp_cv_struct_clockinfo_has_hz],
    [AC_COMPILE_IFELSE(
	[AC_LANG_PROGRAM(
	    [[
		#include <sys/time.h>
	    ]],
	    [[
		extern struct clockinfo *pc;
		return pc->hz;
	    ]]
	)],
	[ntp_cv_struct_clockinfo_has_hz=yes],
	[ntp_cv_struct_clockinfo_has_hz=no]
    )]
)
case "$ntp_cv_struct_clockinfo_has_hz" in
 yes)
    AC_DEFINE([HAVE_HZ_IN_STRUCT_CLOCKINFO], [1], [Obvious])
esac

AC_CACHE_CHECK(
    [struct clockinfo for tickadj],
    [ntp_cv_struct_clockinfo_has_hz],
    [AC_COMPILE_IFELSE(
	[AC_LANG_PROGRAM(
	    [[
		#include <sys/time.h>
	    ]],
	    [[
		extern struct clockinfo *pc;
		return pc->tickadj;
	    ]]
	)],
	[ntp_cv_struct_clockinfo_has_hz=yes],
	[ntp_cv_struct_clockinfo_has_hz=no]
    )]
)
case "$ntp_cv_struct_clockinfo_has_hz" in
 yes)
    AC_DEFINE([HAVE_TICKADJ_IN_STRUCT_CLOCKINFO], [1], [Obvious])
esac

case "$ntp_cv_struct_ntptimeval" in
 yes)
    AC_CHECK_MEMBERS(
	[struct ntptimeval.time.tv_nsec],
	[],
	[],
	[
	    #ifdef HAVE_SYS_TIME_H
	    # include <sys/time.h>
	    #else
	    # ifdef HAVE_TIME_H
	    #  include <time.h>
	    # endif
	    #endif
	    #ifdef HAVE_SYS_TIMEX_H
	    # include <sys/timex.h>
	    #else
	    # ifdef HAVE_TIMEX_H
	    #  include <timex.h>
	    # endif
	    #endif
	]
    )
esac

#### 

AC_CHECK_FUNCS([arc4random_buf])

#### 

saved_LIBS="$LIBS"
LIBS="$LIBS $LDADD_LIBNTP"
AC_CHECK_FUNCS([daemon])
# XXX if we keep everything in LIBS and also keep separate lists, this simplifies.
LIBS="$saved_LIBS"
AS_UNSET([saved_LIBS])

AC_CHECK_FUNCS(
    [finite],
    [],
    [AC_CHECK_FUNCS(
	[isfinite],
	[],
	[
	    AC_MSG_CHECKING([for isfinite with <math.h>])
	    _libs=$LIBS
	    # XXX
	    LIBS="$LIBS -lm"
	    AC_LINK_IFELSE(
		[AC_LANG_PROGRAM(
		    [[
			#include <math.h>
		    ]],
		    [[
			float f = 0.0;
			isfinite(f);
		    ]]
		)],
		[ans=yes],
		[ans=no]
	    )
	    LIBS=$_libs
	    AC_MSG_RESULT([$ans])
	    case "$ans" in
	     yes)
		AC_DEFINE([HAVE_ISFINITE], [1])
	    esac
	]
    )]
)

AC_CHECK_FUNCS([fnmatch getbootfile getuid getrusage nanosleep strsignal])

# kvm_open() is only used by tickadj.  Also see above.
case "$ac_cv_header_kvm_h" in
 yes)
    AC_CHECK_FUNCS([kvm_open])
    ;;
esac

case "$host" in
 *-*-sco3.2v5.0.*)
    # Just stubs.  Sigh.
    ;;
 *) AC_CHECK_FUNCS([mkstemp])
    ;;
esac
AC_CHECK_FUNCS([mktime])
case "$host" in
 *-*-aix[[4-9]]*)
    # XXX only verified thru AIX6.
    # Just a stub.  Sigh.
    ;;
 *-*-irix[[45]]*)
    # Just a stub in "old" Irix.  Sigh.
    ;;
# In the belief that the fix for bug 1223 fixes mlockall() under linux...
# *-*-*linux*)
#    # there, but more trouble than it is worth for now (resolver problems)
#    ;;
 *-*-qnx*)
    # Apparently there but not working in QNX.  Sigh?
    ;;
 *-*-sco3.2v5.0.*)
    # Just a stub.  Sigh.
    ;;
 alpha*-dec-osf4*|alpha*-dec-osf5*)
    # mlockall is there, as a #define calling memlk via <sys/mman.h>
    # Not easy to test for - cheat.
    AC_CHECK_FUNCS([memlk], [ac_cv_func_mlockall=yes])
    AC_CHECK_FUNCS([mlockall])
    ;;
 *) AC_CHECK_FUNCS([mlockall])
    ;;
esac
AC_CHECK_FUNCS([nice plock pututline pututxline readlink rtprio])
case "$host" in
 *-*-aix[[4-9]]*)
    # XXX only verified thru AIX6.
    # Just a stub in AIX 4.  Sigh.
    ;;
 *-*-solaris2.5*)
    # Just stubs in solaris2.5.  Sigh.
    ;;
 *) AC_CHECK_FUNCS([sched_setscheduler])
    ;;
esac
AC_CHECK_FUNCS([setlinebuf setpgid setpriority setsid setvbuf])
AC_CHECK_FUNCS([strdup strerror setrlimit strchr])
case "$host" in
 *-*-aix[[4-9]]*)
    # XXX only verified thru AIX6.
    # Just stubs.  Sigh.
    ;;
 *-*-netbsd1*)
    # Just stubs.  Sigh.
    ;;
 *-*-netbsdelf1*)
    # Just stubs.  Sigh.
    ;;
 *-*-openbsd*)
    # Just stubs.  Sigh.
    ;;
 *)
    AC_CHECK_FUNCS([timer_create])
    ;;
esac

NTP_RLIMIT_ITEMS

# some OSes prefer _exit() in forked children to exit()
AC_CHECK_FUNCS([_exit])
ntp_worker_child_exit=exit
case "$ac_cv_func__exit::$host_os" in
 yes::netbsd*)
    ntp_worker_child_exit=_exit
    ;;
 yes::openbsd*)
    ntp_worker_child_exit=_exit
    ;;
esac
AC_DEFINE_UNQUOTED([WORKER_CHILD_EXIT], [$ntp_worker_child_exit],
		   [routine worker child proc uses to exit.])

AC_CHECK_FUNCS([umask uname updwtmp updwtmpx])

###

# http://bugs.ntp.org/737
case "$ac_cv_func_recvmsg" in
 yes)
    AC_CACHE_CHECK(
	[if we need extra help to define struct iovec],
	[ntp_cv_struct_iovec_help],
	[
	    compiled=no
	    for ntp_cv_struct_iovec_help in '0' '1'; do
		AC_COMPILE_IFELSE(
		    [AC_LANG_PROGRAM(
			[[
			    #ifdef HAVE_SYS_TYPES_H
			    # include <sys/types.h>
			    #endif
			    #ifdef HAVE_SYS_SOCKET_H
			    # include <sys/socket.h>
			    #endif
			    #if $ntp_cv_struct_iovec_help
			    # include <sys/uio.h>
			    #endif
			]],
			[[
			    void foo(void) {
				ssize_t x;
				int s = 0;
				struct iovec iov;
				struct msghdr mh;
				int flags = 0;

				mh.msg_iov = &iov;
				x = recvmsg(s, &mh, flags);
			    }
			]]
		    )],
		    [compiled=yes ; break 1],
		    []
		)
	    done
	    case "$compiled" in
	     no)
		ntp_cv_struct_iovec_help=0
	    esac
	    AS_UNSET([compiled])
	]
    )
    case "$ntp_cv_struct_iovec_help" in
     1)
	AC_DEFINE([HAVE_SYS_UIO_H], [1],
	    [Use sys/uio.h for struct iovec help])
    esac
esac

AC_CACHE_CHECK(
    [number of arguments taken by setpgrp()],
    [ntp_cv_func_setpgrp_nargs],
    [AC_COMPILE_IFELSE(
	[AC_LANG_PROGRAM(
	    [[
		#ifdef HAVE_SYS_TYPES_H
		# include <sys/types.h>
		#endif
		#ifdef HAVE_UNISTD_H
		# include <unistd.h>
		#endif
	    ]],
	    [[
		setpgrp(0, 0);
	    ]]
	)],
	[ntp_cv_func_setpgrp_nargs=2],
	[ntp_cv_func_setpgrp_nargs=0]
    )]
)
case "$ntp_cv_func_setpgrp_nargs" in
 0)
    AC_DEFINE([HAVE_SETPGRP_0], [1],
	      [define if setpgrp takes 0 arguments])
esac

AC_CACHE_CHECK(
    [if we need to declare 'errno'],
    [ntp_cv_decl_errno],
    [AC_COMPILE_IFELSE(
	[AC_LANG_PROGRAM(
	    [[
		#ifdef HAVE_ERRNO_H
		# include <errno.h>
		#endif
	    ]],
	    [[
		errno = 0;
	    ]]
	)],
	[ntp_cv_decl_errno=no],
	[ntp_cv_decl_errno=yes]
    )]
)
case "$ntp_cv_decl_errno" in
 yes)
    AC_DEFINE([DECL_ERRNO], [1], [Declare errno?])
esac

dnl (prr) aix 4.3 defines h_errno as (*(int *)h_errno_which()) for
dnl MT purposes.  This makes the line "extern int h_errno" choke
dnl the compiler.  Hopefully adding !defined(h_errno) fixes this
dnl without breaking any other platforms.
dnl
AC_CACHE_CHECK(
    [if we may declare 'h_errno'],
    [ntp_cv_decl_h_errno],
    [AC_COMPILE_IFELSE(
	[AC_LANG_PROGRAM(
	    [[
		#include <sys/types.h>
		#ifdef HAVE_NETINET_IN_H
		# include <netinet/in.h>
		#endif
		#ifdef HAVE_ARPA_NAMESER_H
		# include <arpa/nameser.h>
		#endif
		#ifdef HAVE_NETDB_H
		# include <netdb.h>
		#endif
		#ifdef HAVE_RESOLV_H
		# include <resolv.h>
		#endif
	    ]],
	    [[
		extern int h_errno;
	    ]]
	)],
	[ntp_cv_decl_h_errno=yes],
	[ntp_cv_decl_h_errno=no]
    )]
)
case "$ntp_cv_decl_h_errno" in
 yes)
    AC_DEFINE([DECL_H_ERRNO], [1], [Declare h_errno?])
esac

AC_CACHE_CHECK(
    [if declaring 'syscall()' is ok],
    [ntp_cv_decl_syscall],
    [AC_COMPILE_IFELSE(
	[AC_LANG_PROGRAM(
	    [[
		#ifdef HAVE_SYS_TYPES_H
		# include <sys/types.h>
		#endif
		#ifdef HAVE_UNISTD_H
		# include <unistd.h>
		#endif
	    ]],
	    [[
		extern int syscall (int, ...);
	    ]]
	)]
	[ntp_cv_decl_syscall=yes],
	[ntp_cv_decl_syscall=no]
    )]
)
case "$ntp_cv_decl_syscall" in
 yes)
    AC_DEFINE([DECL_SYSCALL], [1], [Declare syscall()?])
esac

case "$host" in
 *-*-aix4.3.*)
    AC_DEFINE([DECL_HSTRERROR_0], [1], [Declaration style])		# Needed for XLC under AIX 4.3.2
    ;;
 *-*-mpeix*)
    AC_DEFINE([DECL_ADJTIME_0], [1], [Declaration style])
    AC_DEFINE([DECL_INET_NTOA_0], [1], [Declaration style])
    AC_DEFINE([DECL_MKTEMP_0], [1], [Declaration style])
    AC_DEFINE([DECL_SELECT_0], [1], [Declaration style])
    AC_DEFINE([DECL_SETITIMER_0], [1], [Declaration style])
    AC_DEFINE([DECL_SYSLOG_0], [1], [Declaration style])
    AC_DEFINE([DECL_TIMEOFDAY_0], [1], [Declaration style])
    ;;
 *-*-osf[[45]]*)
    AC_DEFINE([DECL_PLOCK_0], [1], [Declaration style])
    AC_DEFINE([DECL_STIME_1], [1], [Declaration style])
    ;;
 *-*-qnx*)
    AC_DEFINE([DECL_ADJTIME_0], [1], [Declaration style])
    ;;
 *-*-riscos4*)
    AC_DEFINE([DECL_ADJTIME_0], [1], [Declaration style])
    AC_DEFINE([DECL_BZERO_0], [1], [Declaration style])
    AC_DEFINE([DECL_IOCTL_0], [1], [Declaration style])
    AC_DEFINE([DECL_IPC_0], [1], [Declaration style])
    AC_DEFINE([DECL_MEMMOVE_0], [1], [Declaration style])
    AC_DEFINE([DECL_MKTEMP_0], [1], [Declaration style])
    AC_DEFINE([DECL_RENAME_0], [1], [Declaration style])
    AC_DEFINE([DECL_SELECT_0], [1], [Declaration style])
    AC_DEFINE([DECL_SETITIMER_0], [1], [Declaration style])
    AC_DEFINE([DECL_SETPRIORITY_0], [1], [Declaration style])
    AC_DEFINE([DECL_STDIO_0], [1], [Declaration style])
    AC_DEFINE([DECL_STRTOL_0], [1], [Declaration style])
    AC_DEFINE([DECL_SYSLOG_0], [1], [Declaration style])
    AC_DEFINE([DECL_TIME_0], [1], [Declaration style])
    AC_DEFINE([DECL_TIMEOFDAY_0], [1], [Declaration style])
    AC_DEFINE([DECL_TOLOWER_0], [1], [Declaration style])
    ;;
 *-*-solaris2*)
    AC_DEFINE([DECL_MKSTEMP_0], [1], [Declaration style])
    AC_DEFINE([DECL_SETPRIORITY_1], [1], [Declaration style])
    case "$host" in
     *-*-solaris2.4)
        AC_DEFINE([DECL_TIMEOFDAY_0], [1], [Declaration style])
	;;
    esac
    ;;
 *-*-sunos4*)
    AC_DEFINE([DECL_ADJTIME_0], [1], [Declaration style])
    AC_DEFINE([DECL_BCOPY_0], [1], [Declaration style])
    AC_DEFINE([DECL_BZERO_0], [1], [Declaration style])
    AC_DEFINE([DECL_IOCTL_0], [1], [Declaration style])
    AC_DEFINE([DECL_IPC_0], [1], [Declaration style])
    AC_DEFINE([DECL_MEMMOVE_0], [1], [Declaration style])
    AC_DEFINE([DECL_MKTEMP_0], [1], [Declaration style])
    AC_DEFINE([DECL_MKSTEMP_0], [1], [Declaration style])
    AC_DEFINE([DECL_RENAME_0], [1], [Declaration style])
    AC_DEFINE([DECL_SELECT_0], [1], [Declaration style])
    AC_DEFINE([DECL_SETITIMER_0], [1], [Declaration style])
    AC_DEFINE([DECL_SETPRIORITY_0], [1], [Declaration style])
    AC_DEFINE([DECL_SIGVEC_0], [1], [Declaration style])
    case "`basename $ac_cv_prog_CC`" in
     acc*) ;;
     *) AC_DEFINE([DECL_STDIO_0], [1], [Declaration style])
	;;
    esac
    AC_DEFINE([DECL_STRTOL_0], [1], [Declaration style])
    AC_DEFINE([DECL_SYSLOG_0], [1], [Declaration style])
    AC_DEFINE([DECL_TIME_0], [1], [Declaration style])
    AC_DEFINE([DECL_TIMEOFDAY_0], [1], [Declaration style])
    AC_DEFINE([DECL_TOLOWER_0], [1], [Declaration style])
    AC_DEFINE([DECL_TOUPPER_0], [1], [Declaration style])
    AC_DEFINE([DECL_STRERROR_0], [1], [Declaration style])
    ;;
 *-*-ultrix4*)
    AC_DEFINE([DECL_ADJTIME_0], [1], [Declaration style])
    AC_DEFINE([DECL_BZERO_0], [1], [Declaration style])
    AC_DEFINE([DECL_CFSETISPEED_0], [1], [Declaration style])
    AC_DEFINE([DECL_IOCTL_0], [1], [Declaration style])
    AC_DEFINE([DECL_IPC_0], [1], [Declaration style])
    AC_DEFINE([DECL_MKTEMP_0], [1], [Declaration style])
    AC_DEFINE([DECL_NLIST_0], [1], [Declaration style])
    AC_DEFINE([DECL_PLOCK_0], [1], [Declaration style])
    AC_DEFINE([DECL_SELECT_0], [1], [Declaration style])
    AC_DEFINE([DECL_SETITIMER_0], [1], [Declaration style])
    AC_DEFINE([DECL_SETPRIORITY_0], [1], [Declaration style])
    AC_DEFINE([DECL_STIME_0], [1], [Declaration style])
    AC_DEFINE([DECL_SYSLOG_0], [1], [Declaration style])
    AC_DEFINE([DECL_TIMEOFDAY_0], [1], [Declaration style])
    ;;
esac

case "$host" in
 *-*-sco3.2*)
    AC_DEFINE([TERMIOS_NEEDS__SVID3], [1],
	[Do we need to #define _SVID3 when we #include <termios.h>?])
    ;;
esac

case "$host" in
 *-*-hpux[[567]]*)
    AC_DEFINE([NEED_RCVBUF_SLOP], [1],
	[Do we need extra room for SO_RCVBUF? (HPUX < 8)])
esac

dnl Using AC_CACHE_CHECK to honor preset ntp_cv_var_open_bcast_socket
AC_CACHE_CHECK(
    [if we will open the broadcast socket],
    [ntp_cv_var_open_bcast_socket],
    [
	ans=yes
	case "$host" in
	 *-*-domainos)
	    ans=no
	esac
	ntp_cv_var_open_bcast_socket=$ans
    ]
)
case "$ntp_cv_var_open_bcast_socket" in
 yes)
    AC_DEFINE([OPEN_BCAST_SOCKET], [1],
	[Should we open the broadcast socket?])
esac

case "$host" in
 *-*-hpux*)
    AC_DEFINE([NEED_HPUX_FINDCONFIG], [1],
	[Do we want the HPUX FindConfig()?])
esac

dnl using AC_CACHE_CHECK to honor preset $ntp_cv_arg_setpgrp_negpid
AC_CACHE_CHECK(
    [if process groups are set with -pid],
    [ntp_cv_arg_setpgrp_negpid],
    [
	case "$host" in
	 *-*-hpux[[567]]*)
	    ans=no
	    ;;
	 *-*-hpux*)
	    ans=yes
	    ;;
	 *-*-*linux*)
	    ans=yes
	    ;;
	 *-*-sunos3*)
	    ans=yes
	    ;;
	 *-*-ultrix2*)
	    ans=yes
	    ;;
	 *)
	    ans=no
	    ;;
	esac
	ntp_cv_arg_setpgrp_negpid=$ans
    ]
)
case "$ntp_cv_arg_setpgrp_negpid" in
 yes)
    AC_DEFINE([UDP_BACKWARDS_SETOWN], [1],
	[Do we set process groups with -pid?])
esac

AC_CACHE_CHECK(
    [if we need a ctty for F_SETOWN],
    [ntp_cv_func_ctty_for_f_setown],
    [
	case "$host" in
	 *-*-bsdi[[23]]*)
	    ans=yes
	    ;;
	 *-*-freebsd*)
	    ans=yes
	    ;;
	# NetBSD versions prior to 3.99.8 require a CTTY for F_SETOWN,
	# while later versions will fail a ioctl(TIOCSCTTY, 0) call in
	# some cases and so should not have USE_FSETOWNCTTY.  "netbsd"
	# in $host may be followed by "aout", "ecoff", or "elf".
	 *-*-netbsd*[[a-z]]3.[[0-8]]*|*-*-netbsd*[[a-z]][[0-2]].*|*-*-netbsd*[[a-z]]3.99.[[0-7]])
	    ans=yes
	    ;;
	 *-*-netbsd3.[[0-8]]*|*-*-netbsd[[0-2]].*|*-*-netbsd3.99.[[0-7]])
	    ans=yes
	    ;;
	 *-*-openbsd*)
	    ans=yes
	    ;;
	 *-*-osf*)
	    ans=yes
	    ;;
	 *-*-darwin*)
	    ans=yes
	    ;;
	 *)
	    ans=no
	    ;;
	esac
	ntp_cv_func_ctty_for_f_setown=$ans
    ]
)
case "$ntp_cv_func_ctty_for_f_setown" in
 yes)
    AC_DEFINE([USE_FSETOWNCTTY], [1], [Must we have a CTTY for fsetown?])
esac

AC_CACHE_CHECK(
    [if the OS clears cached routes when more specifics become available],
    [ntp_cv_os_routeupdates],
    [
	case "$host" in
	 *-*-netbsd*)
	    ans=yes
	    ;;
	 *)
	    ans=no
	    ;;
	esac
	ntp_cv_os_routeupdates=$ans
    ]
)
case "$ntp_cv_os_routeupdates" in
 yes)
    AC_DEFINE([OS_MISSES_SPECIFIC_ROUTE_UPDATES], [1],
	[need to recreate sockets on changed routing?])
esac

AC_CACHE_CHECK(
    [if the wildcard socket needs REUSEADDR to bind other addresses],
    [ntp_cv_os_wildcardreuse],
    [
	case "$host" in
	 *-*-*linux*)
	    ans=yes
	    ;;
	 *) ans=no
	    ;;
	esac
	ntp_cv_os_wildcardreuse=$ans
    ]
)
case "$ntp_cv_os_wildcardreuse" in
 yes)
    AC_DEFINE([OS_NEEDS_REUSEADDR_FOR_IFADDRBIND], [1],
	[wildcard socket needs REUSEADDR to bind interface addresses])
esac

case "$host" in
 *-*-aix*)
    AC_DEFINE([NLIST_EXTRA_INDIRECTION], [1],
	[Might nlist() values require an extra level of indirection (AIX)?])
esac

AC_CACHE_CHECK(
    [for a minimum recommended value of tickadj],
    [ntp_cv_var_min_rec_tickadj],
    [
	ans=no
	case "$host" in
	 *-*-aix*)
	    ans=40
	    ;;
	esac
	ntp_cv_var_min_rec_tickadj=$ans
    ]
)
case "$ntp_cv_var_min_rec_tickadj" in
 ''|no)
    ;;
 *)
    AC_DEFINE_UNQUOTED([MIN_REC_TICKADJ], [$ntp_cv_var_min_rec_tickadj],
	[Should we recommend a minimum value for tickadj?])
esac

AC_CACHE_CHECK(
    [if the TTY code permits PARENB and IGNPAR],
    [ntp_cv_no_parenb_ignpar],
    [
	ans=no
	case "$host" in
	 i?86-*-*linux*)
	    ans=yes
	    ;;
	 mips-sgi-irix*)
	    ans=yes
	    ;;
	 i?86-*-freebsd[[123]].*)
	    ;;
	 i?86-*-freebsd*)
	    ans=yes
	    ;;
	 *-*-unicosmp*)
	    ans=yes
	    ;;
	esac
	ntp_cv_no_parenb_ignpar=$ans
    ]
)
case "$ntp_cv_no_parenb_ignpar" in
 yes)
    AC_DEFINE([NO_PARENB_IGNPAR], [1],
	[Is there a problem using PARENB and IGNPAR?])
esac

AC_MSG_CHECKING([if we're including processing time debugging code])
AC_ARG_ENABLE(
    [debug-timing],
    [AS_HELP_STRING(
	[--enable-debug-timing],
	[- include processing time debugging code (costs performance)]
    )],
    [ntp_ok=$enableval],
    [ntp_ok=no]
)
case "$ntp_ok" in
 yes)
    AC_DEFINE([DEBUG_TIMING], [1], [Enable processing time debugging?])
esac
AC_MSG_RESULT([$ntp_ok])

AC_MSG_CHECKING([for a the number of minutes in a DST adjustment])
AC_ARG_ENABLE(
    [dst-minutes],
    [AS_HELP_STRING(
	[--enable-dst-minutes],
	[=60 minutes per DST adjustment])   dnl @<:@ is [, @:>@ is ]
    ],
    [ans=$enableval],
    [ans=60]
)
AC_DEFINE_UNQUOTED([DSTMINUTES], [$ans],
    [The number of minutes in a DST adjustment])
AC_MSG_RESULT([$ans])

AC_MSG_CHECKING([if ntpd will retry permanent DNS failures])
AC_ARG_ENABLE(
    [ignore-dns-errors],
    [AS_HELP_STRING(
	[--enable-ignore-dns-errors],
	[- retry DNS queries on any error]
    )],
    [ans=$enableval],
    [ans=no]
)
case "$ans" in
 yes)
    AC_DEFINE([IGNORE_DNS_ERRORS], [1],
	[Retry queries on _any_ DNS error?])
esac
AC_MSG_RESULT([$ans])

AC_CACHE_CHECK(
    [availability of ntp_{adj,get}time()],
    [ntp_cv_var_ntp_syscalls],
    [
	ntp_cv_var_ntp_syscalls=no
	case "$ac_cv_func_ntp_adjtime$ac_cv_func_ntp_gettime$ac_cv_func___adjtimex" in
	 yesyes*)
	    ntp_cv_var_ntp_syscalls=libc
	    ;;
	 *yes)
	    ntp_cv_var_ntp_syscalls=inline
	    ;;
	 *)
	    AC_PREPROC_IFELSE(
		[AC_LANG_SOURCE(
		    [
			#include <sys/syscall.h>
			#if !defined(SYS_ntp_gettime) || !defined(SYS_ntp_adjtime)
			# error
			#endif
		    ])],
		[ntp_cv_var_ntp_syscalls=kernel]
	    )
	    ;;
	 esac
    ]
)
case "$ntp_cv_var_ntp_syscalls" in
 libc)
    AC_DEFINE([NTP_SYSCALLS_LIBC], [1],
	[Do we have ntp_{adj,get}time in libc?])
    ;;
 kernel)
    AC_DEFINE([NTP_SYSCALLS_STD], [1],
	[Do we have ntp_{adj,get}time in the kernel?])
    ;;
esac

AC_CACHE_CHECK(
    [if sys/timex.h has STA_FLL],
    [ntp_cv_var_sta_fll],
    [AC_PREPROC_IFELSE(
	[AC_LANG_SOURCE(
	    [
		#include <sys/timex.h>
		#ifndef STA_FLL
		# error
		#endif
	    ])],
	[ntp_cv_var_sta_fll=yes],
	[ntp_cv_var_sta_fll=no]
    )]
)

AC_CACHE_CHECK(
    [if we have kernel PLL support],
    [ntp_cv_var_kernel_pll],
    [dnl ntp_cv_var_ntp_syscalls is {no,libc,kernel}
	case "$ac_cv_header_sys_timex_h$ntp_cv_struct_ntptimeval$ntp_cv_var_sta_fll$ntp_cv_var_ntp_syscalls" in
	 *no*)
	    ntp_cv_var_kernel_pll=no
	    ;;
	 *) ntp_cv_var_kernel_pll=yes
	    ;;
	esac
    ]
)
case "$ntp_cv_var_kernel_pll" in
 yes)
    AC_DEFINE([KERNEL_PLL], [1],
	[Does the kernel support precision time discipline?])
esac

AC_CACHE_CHECK(
    [if SIOCGIFCONF returns buffer size in the buffer],
    [ntp_cv_size_returned_in_buffer],
    [
	ans=no
	case "$host" in
	 *-fujitsu-uxp*)
	    ans=yes
	    ;;
	 *-ncr-sysv4*)
	    ans=yes
	    ;;
	 *-univel-sysv*)
	    ans=yes
	    ;;
	esac
	ntp_cv_size_returned_in_buffer=$ans
    ]
)
case "$ntp_cv_size_returned_in_buffer" in
 yes)
    AC_DEFINE([SIZE_RETURNED_IN_BUFFER], [1],
	[Does SIOCGIFCONF return size in the buffer?])
esac

# Check for ioctls TIOCGPPSEV
AC_MSG_CHECKING([for TTY PPS ioctl TIOCGPPSEV])
case "$ac_cv_header_termios_h" in
 yes)
    AC_PREPROC_IFELSE(
	[AC_LANG_SOURCE([
	    #include <termios.h>
	    #ifndef TIOCGPPSEV
	    # error
	    #endif
	])],
	[ntp_ok=yes],
	[ntp_ok=no]
    )
    ;;
 *)
    ntp_ok=no
    ;;
esac
case "$ntp_ok" in
 yes)
    AC_DEFINE([HAVE_TIOCGPPSEV], [1],
	[Do we have the TIOCGPPSEV ioctl (Solaris)?])
esac
AC_MSG_RESULT([$ntp_ok])

# Check for ioctls TIOCSPPS
AC_MSG_CHECKING([for TTY PPS ioctl TIOCSPPS])
case "$ac_cv_header_termios_h" in
 yes)
    AC_PREPROC_IFELSE(
	[AC_LANG_SOURCE([
	    #include <termios.h>
	    #ifndef TIOCSPPS
	    # error
	    #endif
	 ])],
	 [ntp_ok=yes],
	 [ntp_ok=no]
    )
    ;;
 *)
    ntp_ok=no
    ;;
esac
case "$ntp_ok" in
 yes)
    AC_DEFINE([HAVE_TIOCSPPS], [1],
	[Do we have the TIOCSPPS ioctl (Solaris)?])
esac
AC_MSG_RESULT([$ntp_ok])

# Check for ioctls CIOGETEV
AC_MSG_CHECKING([for TTY PPS ioctl CIOGETEV])
case "$ac_cv_header_sys_ppsclock_h" in
 yes)
    AC_PREPROC_IFELSE(
	[AC_LANG_SOURCE([
	    #include <sys/ppsclock.h>
	    #ifndef CIOGETEV
	    # error
	    #endif
	])],
	[ntp_ok=yes],
	[ntp_ok=no]
    )
    ;;
 *)
    ntp_ok=no
    ;;
esac
case "$ntp_ok" in
 yes)
    AC_DEFINE([HAVE_CIOGETEV], [1],
	[Do we have the CIOGETEV ioctl (SunOS, Linux)?])
esac
AC_MSG_RESULT([$ntp_ok])

# ATOM/PPSAPI stuff.

ntp_atom_ok=yes

# Check for header timepps.h, if found then we have PPS API (Draft RFC) stuff.

# The PPSAPI headers need "inline" ($ac_cv_c_inline='inline')
# The PPSAPI needs struct timespec.
# The PPSAPI also needs a timepps header.

case "$ac_cv_c_inline$ntp_cv_struct_timespec" in
 inlineyes)
    case "$ac_cv_header_timepps_h$ac_cv_header_sys_timepps_h$host_os" in
     *yes* | *sunos* | *solaris* | *sco* | *netbsd* )
	AC_DEFINE(HAVE_PPSAPI, 1, [Do we have the PPS API per the Draft RFC?])
	ntp_jupiter_ok=yes
	ntp_oncore_ok=yes
	ntp_parse_ok=yes
	ntp_ripe_ncc_ok=yes
	;;
    esac
    ;;
esac

# Check for ioctls TIOCGSERIAL, TIOCSSERIAL, ASYNC_PPS_CD_POS, ASYNC_PPS_CD_NEG
AC_CHECK_HEADER([linux/serial.h])
case "$ac_cv_header_sys_ppsclock_h$ac_cv_header_linux_serial_h" in
  yesyes)
    AC_MSG_CHECKING([ioctl TIOCGSERIAL, TIOCSSERIAL, ASYNC_PPS_CD_POS, ASYNC_PPS_CD_NEG])
    AC_PREPROC_IFELSE(
	[AC_LANG_SOURCE([
	    #include <sys/time.h>
	    typedef int u_int;
	    #include <sys/ppsclock.h>
	    #include <linux/serial.h>

	    #ifndef TIOCGSERIAL
	    # error
	    #endif
	    #ifndef TIOCSSERIAL
	    # error
	    #endif
	    #ifndef ASYNC_PPS_CD_POS
	    # error
	    #endif
	    #ifndef ASYNC_PPS_CD_NEG
	    # error
	    #endif
	    #ifndef CIOGETEV
	    # error
	    #endif
	])],
	[ntp_ok=yes],
	[ntp_ok=no]
    )
    AC_MSG_RESULT([$ntp_ok])
    ;;
  *)
    ntp_ok=no
    ;;
esac
case "$ntp_ok" in
 yes)
    AC_DEFINE([HAVE_TIO_SERIAL_STUFF], 1,
	[Do we have the TIO serial stuff?])
esac

# Check for SHMEM_STATUS support
AC_MSG_CHECKING([SHMEM_STATUS support])
case "$ac_cv_header_sys_mman_h" in
 yes)
    ntp_ok=yes
    ;;
 *)
    ntp_ok=no
    ;;
esac
case "$ntp_ok" in
 yes)
    AC_DEFINE([ONCORE_SHMEM_STATUS], [1],
	[Do we have support for SHMEM_STATUS?])
esac
AC_MSG_RESULT([$ntp_ok])

ntp_refclock=no

# HPUX only, and by explicit request
AC_MSG_CHECKING([Datum/Bancomm bc635/VME interface])
AC_ARG_ENABLE(
    [BANCOMM],
    [AS_HELP_STRING(
	[--enable-BANCOMM],
	[- Datum/Bancomm bc635/VME interface]
    )],
    [ntp_ok=$enableval],
    [ntp_ok=no]
)
case "$ntp_ok" in
 yes)
    ntp_refclock=yes
    AC_DEFINE([CLOCK_BANC], [1], [Datum/Bancomm bc635/VME interface?])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])
case "$ntp_ok$host" in
 yes*-*-hpux*) ;;
 yes*) AC_MSG_WARN([*** But the expected answer is... no ***]) ;;
esac

#HPUX only, and only by explicit request
AC_MSG_CHECKING([TrueTime GPS receiver/VME interface])
AC_ARG_ENABLE(
    [GPSVME],
    [AS_HELP_STRING(
	[--enable-GPSVME],
	[- TrueTime GPS receiver/VME interface]
    )],
    [ntp_ok=$enableval],
    [ntp_ok=no]
)
case "$ntp_ok" in
 yes)
    ntp_refclock=yes
    AC_DEFINE([CLOCK_GPSVME], 1, [TrueTime GPS receiver/VME interface?])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])
case "$ntp_ok$host" in
 yes*-*-hpux*) ;;
 yes*) AC_MSG_WARN([*** But the expected answer is... no ***]) ;;
esac

AC_MSG_CHECKING([for PCL720 clock support])
case "$ac_cv_header_machine_inline_h$ac_cv_header_sys_pcl720_h$ac_cv_header_sys_i8253_h" in
 yesyesyes)
    AC_DEFINE([CLOCK_PPS720], 1, [PCL 720 clock support])
    ans=yes
    ;;
 *)
    ans=no
    ;;
esac
AC_MSG_RESULT([$ans])

AC_MSG_CHECKING([for default inclusion of all suitable non-PARSE clocks])
AC_ARG_ENABLE(
    [all-clocks],
    [AS_HELP_STRING(
	[--enable-all-clocks],
	[+ include all suitable non-PARSE clocks:]
    )],
    [ntp_eac=$enableval],
    [ntp_eac=yes]
)
AC_MSG_RESULT([$ntp_eac])

# HMS: Should we also require ntp_parse_ok?
AC_MSG_CHECKING([if we have support for PARSE clocks])
case "$ntp_atom_ok$ac_cv_header_termio_h$ac_cv_header_termios_h" in
 yes*yes*)
    ntp_canparse=yes
    ;;
 *) ntp_canparse=no
    ;;
esac
AC_MSG_RESULT([$ntp_canparse])

AC_MSG_CHECKING([if we have support for audio clocks])
case "$ac_cv_header_sun_audioio_h$ac_cv_header_sys_audioio_h$ac_cv_header_machine_soundcard_h$ac_cv_header_sys_soundcard_h" in
 *yes*)
    ntp_canaudio=yes
    AC_DEFINE([HAVE_AUDIO], [], [Do we have audio support?])
    ;;
 *) ntp_canaudio=no ;;
esac
AC_MSG_RESULT([$ntp_canaudio])

AC_MSG_CHECKING([if we have support for the SHM refclock interface])
case "$ac_cv_header_sys_ipc_h$ac_cv_header_sys_shm_h" in
 yesyes)
    ntp_canshm=yes
    ;;
 *) ntp_canshm=no ;;
esac
AC_MSG_RESULT([$ntp_canshm])

# Test for termios TIOCMBIS modem control (ACTS, Heath, Palisade)
AC_CACHE_CHECK(
    [for termios modem control],
    [ntp_cv_modem_control],
    [AC_COMPILE_IFELSE(
	[AC_LANG_PROGRAM(
	    [[
		#ifdef HAVE_UNISTD_H
		# include <unistd.h>
		#endif
		#ifdef HAVE_TERMIOS_H
		# include <termios.h>
		#endif
		#ifdef HAVE_SYS_IOCTL_H
		# include <sys/ioctl.h>
		#endif
	    ]],
	    [[
		int	dtr = TIOCM_DTR;

		ioctl(1, TIOCMBIS, (char *)&dtr);
	    ]]
	)],
	[ntp_cv_modem_control=yes],
	[ntp_cv_modem_control=no]
    )]
)
case "$ntp_eac::$ntp_cv_modem_control" in
 yes::yes)
    ntp_enable_all_modem_control_clocks=yes
    ;;
 *)
    ntp_enable_all_modem_control_clocks=no
    ;;
esac

# Requires modem control
AC_MSG_CHECKING([ACTS modem service])
AC_ARG_ENABLE(
    [ACTS],
    [AS_HELP_STRING(
	[--enable-ACTS],
	[s ACTS modem service]
    )],
    [ntp_ok=$enableval],
    [ntp_ok=$ntp_enable_all_modem_control_clocks]
)
case "$ntp_ok" in
 yes)
    ntp_refclock=yes
    AC_DEFINE([CLOCK_ACTS], [1], [ACTS modem service])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])

AC_MSG_CHECKING([Arbiter 1088A/B GPS receiver])
AC_ARG_ENABLE(
    [ARBITER],
    [AS_HELP_STRING(
	[--enable-ARBITER],
	[+ Arbiter 1088A/B GPS receiver]
    )],
    [ntp_ok=$enableval],
    [ntp_ok=$ntp_eac]
)
case "$ntp_ok" in
 yes)
    ntp_refclock=yes
    AC_DEFINE([CLOCK_ARBITER], [1], [Arbiter 1088A/B GPS receiver])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])

AC_MSG_CHECKING([Arcron MSF receiver])
AC_ARG_ENABLE(
    [ARCRON_MSF],
    [AS_HELP_STRING(
	[--enable-ARCRON-MSF],
	[+ Arcron MSF receiver]
    )],
    [ntp_ok=$enableval],
    [ntp_ok=$ntp_eac]
)
case "$ntp_ok" in
 yes)
    ntp_refclock=yes
    AC_DEFINE([CLOCK_ARCRON_MSF], [1], [ARCRON support?])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])

AC_MSG_CHECKING([Austron 2200A/2201A GPS receiver])
AC_ARG_ENABLE(
    [AS2201],
    [AS_HELP_STRING(
	[--enable-AS2201],
	[+ Austron 2200A/2201A GPS receiver]
    )],
    [ntp_ok=$enableval],
    [ntp_ok=$ntp_eac]
)
case "$ntp_ok" in
 yes)
    ntp_refclock=yes
    AC_DEFINE([CLOCK_AS2201], [1], [Austron 2200A/2201A GPS receiver?])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])

AC_MSG_CHECKING([ATOM PPS interface])
AC_ARG_ENABLE(
    [ATOM],
    [AS_HELP_STRING(
	[--enable-ATOM],
	[s ATOM PPS interface]
    )],
    [ntp_ok=$enableval],
    [ntp_ok=$ntp_eac]
)
case "$ntp_atom_ok" in
 no) ntp_ok=no ;;
esac
case "$ntp_ok" in
 yes)
    ntp_refclock=yes
    AC_DEFINE([CLOCK_ATOM], [1], [PPS interface?])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])

AC_MSG_CHECKING([Chrono-log K-series WWVB receiver])
AC_ARG_ENABLE(
    [CHRONOLOG],
    [AS_HELP_STRING(
	[--enable-CHRONOLOG],
	[+ Chrono-log K-series WWVB receiver]
    )],
    [ntp_ok=$enableval],
    [ntp_ok=$ntp_eac]
)
case "$ntp_ok" in
 yes)
    ntp_refclock=yes
    AC_DEFINE([CLOCK_CHRONOLOG], [1], [Chronolog K-series WWVB receiver?])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])

AC_MSG_CHECKING([CHU modem/decoder])
AC_ARG_ENABLE(
    [CHU],
    [AS_HELP_STRING(
	[--enable-CHU],
	[+ CHU modem/decoder]
    )],
    [ntp_ok=$enableval],
    [ntp_ok=$ntp_eac]
)
case "$ntp_ok" in
 yes)
    ntp_refclock=yes
    AC_DEFINE([CLOCK_CHU], [1], [CHU modem/decoder])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])
ntp_refclock_chu=$ntp_ok

AC_MSG_CHECKING([CHU audio/decoder])
AC_ARG_ENABLE(
    [AUDIO-CHU],
    [AS_HELP_STRING(
	[--enable-AUDIO-CHU],
	[s CHU audio/decoder]
    )],
    [ntp_ok=$enableval],
    [
	case "$ntp_eac$ntp_refclock_chu$ntp_canaudio" in
	 *no*)	ntp_ok=no  ;;
	 *)	ntp_ok=yes ;;
	esac
    ]
)
AC_MSG_RESULT([$ntp_ok])
# We used to check for sunos/solaris target...
case "$ntp_ok$ntp_refclock_chu$ntp_canaudio" in
 yes*no*) AC_MSG_WARN([*** But the expected answer is...no ***])
esac

# Not under HP-UX
AC_MSG_CHECKING([Datum Programmable Time System])
AC_ARG_ENABLE(
    [DATUM],
    [AS_HELP_STRING(
	[--enable-DATUM],
	[s Datum Programmable Time System]
    )],
    [ntp_ok=$enableval],
    [
	case "$ac_cv_header_termios_h" in
	 yes)
	    ntp_ok=$ntp_eac
	    ;;
	 *) ntp_ok=no
	    ;;
	esac
    ]
)
case "$ntp_ok" in
 yes)
    ntp_refclock=yes
    AC_DEFINE([CLOCK_DATUM], [1], [Datum Programmable Time System?])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])

AC_MSG_CHECKING([Dumb generic hh:mm:ss local clock])
AC_ARG_ENABLE(
    [DUMBCLOCK],
    [AS_HELP_STRING(
	[--enable-DUMBCLOCK],
	[+ Dumb generic hh:mm:ss local clock]
    )],
    [ntp_ok=$enableval],
    [ntp_ok=$ntp_eac]
)
case "$ntp_ok" in
 yes)
    ntp_refclock=yes
    AC_DEFINE([CLOCK_DUMBCLOCK], [1], [Dumb generic hh:mm:ss local clock?])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])

AC_MSG_CHECKING([Forum Graphic GPS])
AC_ARG_ENABLE(
    [FG],
    [AS_HELP_STRING(
	[--enable-FG],
	[+ Forum Graphic GPS]
    )],
    [ntp_ok=$enableval],
    [ntp_ok=$ntp_eac]
)
case "$ntp_ok" in
 yes)
    ntp_refclock=yes
    AC_DEFINE([CLOCK_FG], [1], [Forum Graphic GPS datating station driver?])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])

# Requires modem control
AC_MSG_CHECKING([Heath GC-1000 WWV/WWVH receiver])
AC_ARG_ENABLE(
    [HEATH],
    [AS_HELP_STRING(
	[--enable-HEATH],
	[s Heath GC-1000 WWV/WWVH receiver]
    )],
    [ntp_ok=$enableval],
    [ntp_ok=$ntp_enable_all_modem_control_clocks]
)
case "$ntp_ok" in
 yes)
    ntp_refclock=yes
    AC_DEFINE([CLOCK_HEATH], [1], [Heath GC-1000 WWV/WWVH receiver?])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])

AC_MSG_CHECKING([for hopf serial clock device])
AC_ARG_ENABLE(
    [HOPFSERIAL],
    [AS_HELP_STRING(
	[--enable-HOPFSERIAL],
	[+ hopf serial clock device]
    )],
    [ntp_ok=$enableval],
    [ntp_ok=$ntp_eac]
)
case "$ntp_ok" in
 yes)
    ntp_refclock=yes
    AC_DEFINE([CLOCK_HOPF_SERIAL], [1], [HOPF serial clock device?])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])

AC_MSG_CHECKING([for hopf PCI clock 6039])
AC_ARG_ENABLE(
    [HOPFPCI],
    [AS_HELP_STRING(
	[--enable-HOPFPCI],
	[+ hopf 6039 PCI board]
    )],
    [ntp_ok=$enableval],
    [ntp_ok=$ntp_eac]
)
case "$ntp_ok" in
 yes)
    ntp_refclock=yes
    AC_DEFINE([CLOCK_HOPF_PCI], [1], [HOPF PCI clock device?])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])

AC_MSG_CHECKING([HP 58503A GPS receiver])
AC_ARG_ENABLE(
    [HPGPS],
    [AS_HELP_STRING(
	[--enable-HPGPS],
	[+ HP 58503A GPS receiver]
    )],
    [ntp_ok=$enableval],
    [ntp_ok=$ntp_eac]
)
case "$ntp_ok" in
 yes)
    ntp_refclock=yes
    AC_DEFINE([CLOCK_HPGPS], 1, [HP 58503A GPS receiver?])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])

AC_MSG_CHECKING([IRIG audio decoder])
AC_ARG_ENABLE(
    [IRIG],
    [AS_HELP_STRING(
	[--enable-IRIG],
	[s IRIG audio decoder]
    )],
    [ntp_ok=$enableval],
    [
	case "$ntp_eac$ntp_canaudio" in
	 *no*)	ntp_ok=no  ;;
	 *)	ntp_ok=yes ;;
	esac
    ]
)
case "$ntp_ok" in
 yes)
    ntp_refclock=yes
    AC_DEFINE([CLOCK_IRIG], [1], [IRIG audio decoder?])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])
case "$ntp_ok$ntp_canaudio" in
 yesno) AC_MSG_WARN([*** But the expected answer is... no ***])
esac

AC_MSG_CHECKING([for JJY receiver])
AC_ARG_ENABLE(
    [JJY],
    [AS_HELP_STRING(
	[--enable-JJY],
	[+ JJY receiver]
    )],
    [ntp_ok=$enableval],
    [ntp_ok=$ntp_eac]
)
case "$ntp_ok" in
 yes)
    ntp_refclock=yes
    AC_DEFINE([CLOCK_JJY], [1], [JJY receiver?])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])

AC_MSG_CHECKING([Rockwell Jupiter GPS receiver])
AC_ARG_ENABLE(
    [JUPITER],
    [AS_HELP_STRING(
	[--enable-JUPITER],
	[s Rockwell Jupiter GPS receiver]
    )],
    [ntp_ok=$enableval], [ntp_ok=$ntp_eac])
case "$ntp_jupiter_ok" in
 no) ntp_ok=no ;;
esac
case "$ntp_ok" in
 yes)
    ntp_refclock=yes
    AC_DEFINE([CLOCK_JUPITER], [1], [Rockwell Jupiter GPS clock?])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])

AC_MSG_CHECKING([Leitch CSD 5300 Master Clock System Driver])
AC_ARG_ENABLE(
    [LEITCH],
    [AS_HELP_STRING(
	[--enable-LEITCH],
	[+ Leitch CSD 5300 Master Clock System Driver]
    )],
    [ntp_ok=$enableval],
    [ntp_ok=$ntp_eac]
)
case "$ntp_ok" in
 yes)
    ntp_refclock=yes
    AC_DEFINE([CLOCK_LEITCH], [1],
	[Leitch CSD 5300 Master Clock System Driver?])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])

AC_MSG_CHECKING([local clock reference])
AC_ARG_ENABLE(
    [LOCAL-CLOCK],
    [AS_HELP_STRING(
	[--enable-LOCAL-CLOCK],
	[+ local clock reference]
    )],
    [ntp_ok=$enableval],
    [ntp_ok=$ntp_eac]
)
case "$ntp_ok" in
 yes)
    ntp_refclock=yes
    AC_DEFINE([CLOCK_LOCAL], [1], [local clock reference?])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])

dnl Bug 340: longstanding unfixed bugs
dnl AC_MSG_CHECKING([EES M201 MSF receiver])
dnl AC_ARG_ENABLE([MSFEES],
dnl     [AS_HELP_STRING([--enable-MSFEES], [+ EES M201 MSF receiver])],
dnl     [ntp_ok=$enableval], [ntp_ok=$ntp_eac])
dnl if test "$ntp_ok" = "yes"; then
dnl     ntp_refclock=yes
dnl     AC_DEFINE([CLOCK_MSFEES], [1], [EES M201 MSF receiver])
dnl fi
dnl AC_MSG_RESULT([$ntp_ok])

# Not Ultrix
AC_MSG_CHECKING([Magnavox MX4200 GPS receiver])
AC_ARG_ENABLE(
    [MX4200],
    [AS_HELP_STRING(
	[--enable-MX4200 ],
	[s Magnavox MX4200 GPS receiver]
    )],
    [ntp_ok=$enableval],
    [
	case "$ac_cv_var_ppsclock" in
	 yes)
	    ntp_ok=$ntp_eac
	    ;;
	 *)
	    ntp_ok=no
	    ;;
	esac
    ]
)
case "$ntp_ok" in
 yes)
    ntp_refclock=yes
    AC_DEFINE([CLOCK_MX4200], [1], [Magnavox MX4200 GPS receiver])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])
case "$ntp_ok$host" in
 yes*-*-ultrix*) AC_MSG_WARN([*** But the expected answer is... no ***])
esac

AC_MSG_CHECKING([for NeoClock4X receiver])
AC_ARG_ENABLE(
    [NEOCLOCK4X],
    [AS_HELP_STRING(
	[--enable-NEOCLOCK4X],
	[+ NeoClock4X DCF77 / TDF receiver]
    )],
    [ntp_ok=$enableval],
    [ntp_ok=$ntp_eac]
)
case "$ntp_ok" in
 yes)
    ntp_refclock=yes
    AC_DEFINE([CLOCK_NEOCLOCK4X], [1], [NeoClock4X])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])

AC_MSG_CHECKING([NMEA GPS receiver])
AC_ARG_ENABLE(
    [NMEA],
    [AS_HELP_STRING(
	[--enable-NMEA],
	[+ NMEA GPS receiver]
    )],
    [ntp_ok=$enableval],
    [ntp_ok=$ntp_eac]
)
case "$ntp_ok" in
 yes)
    ntp_refclock=yes
    AC_DEFINE([CLOCK_NMEA], [1], [NMEA GPS receiver])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])

AC_CHECK_FUNCS([strtoll])
AC_MSG_CHECKING([for GPSD JSON receiver])
AC_ARG_ENABLE(
    [GPSD],
    [AS_HELP_STRING(
	[--enable-GPSD],
	[+ GPSD JSON receiver]
    )],
    [ntp_ok=$enableval],
    [case "$ac_cv_func_strtoll" in
     yes) ntp_ok=$ntp_eac ;;
     *)   ntp_ok="no" ;;
    esac]
)
case "$ntp_ok" in
 yes)
    ntp_refclock=yes
    AC_DEFINE([CLOCK_GPSDJSON], [1], [GPSD JSON receiver])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])

AC_MSG_CHECKING([for ONCORE Motorola VP/UT Oncore GPS])
AC_ARG_ENABLE(
    [ONCORE],
    [AS_HELP_STRING(
	[--enable-ONCORE],
	[s Motorola VP/UT Oncore GPS receiver]
    )],
    [ntp_ok=$enableval],
    [ntp_ok=$ntp_eac]
)
case "$ntp_oncore_ok" in
 no) ntp_ok=no ;;
esac
case "$ntp_ok" in
 yes)
    ntp_refclock=yes
    AC_DEFINE([CLOCK_ONCORE], 1, [Motorola UT Oncore GPS])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])

# Requires modem control
AC_MSG_CHECKING([for Palisade clock])
AC_ARG_ENABLE(
    [PALISADE],
    [AS_HELP_STRING(
	[--enable-PALISADE],
	[s Palisade clock]
    )],
    [ntp_ok=$enableval],
    [ntp_ok=$ntp_enable_all_modem_control_clocks]
)
case "$ntp_ok" in
 yes)
    ntp_refclock=yes
    AC_DEFINE([CLOCK_PALISADE], [1], [Palisade clock])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])

AC_MSG_CHECKING([Conrad parallel port radio clock])
AC_ARG_ENABLE(
    [PCF],
    [AS_HELP_STRING(
	[--enable-PCF ],
	[+ Conrad parallel port radio clock]
    )],
    [ntp_ok=$enableval],
    [ntp_ok=$ntp_eac]
)
case "$ntp_ok" in
 yes)
    ntp_refclock=yes
    AC_DEFINE([CLOCK_PCF], [1], [Conrad parallel port radio clock])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])

AC_MSG_CHECKING([PST/Traconex 1020 WWV/WWVH receiver])
AC_ARG_ENABLE(
    [PST],
    [AS_HELP_STRING(
	[--enable-PST],
	[+ PST/Traconex 1020 WWV/WWVH receiver]
    )],
    [ntp_ok=$enableval],
    [ntp_ok=$ntp_eac]
)
case "$ntp_ok" in
 yes)
    ntp_refclock=yes
    AC_DEFINE([CLOCK_PST], [1], [PST/Traconex 1020 WWV/WWVH receiver])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])

AC_MSG_CHECKING([RIPENCC specific Trimble driver])
AC_ARG_ENABLE(
    [RIPENCC],
    [AS_HELP_STRING(
	[--enable-RIPENCC],
	[- RIPENCC specific Trimble driver]
    )],
    [ntp_ok=$enableval],
    [ntp_ok=no]
)
# 020629: HMS: s/$ntp_eac -> -/no because of ptr += sprintf(ptr, ...) usage
case "$ntp_ripe_ncc_ok" in
 no) ntp_ok=no ;;
esac
case "$ntp_ok" in
 yes)
    ntp_refclock=yes
    AC_DEFINE([CLOCK_RIPENCC], [],[RIPE NCC Trimble clock])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])

# Danny Meyer says SHM compiles (with a few warnings) under Win32.
# For *IX, we need sys/ipc.h and sys/shm.h.
AC_MSG_CHECKING([for SHM clock attached thru shared memory])
AC_ARG_ENABLE(
    [SHM],
    [AS_HELP_STRING(
	[--enable-SHM],
	[s SHM clock attached thru shared memory]
    )],
    [ntp_ok=$enableval],
    [
	case "$ntp_eac$ntp_canshm" in
	 *no*)	ntp_ok=no  ;;
	 *)	ntp_ok=yes ;;
	esac
    ]
)
case "$ntp_ok" in
 yes)
    ntp_refclock=yes
    AC_DEFINE([CLOCK_SHM], [1], [clock thru shared memory])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])

AC_MSG_CHECKING([Spectracom 8170/Netclock/2 WWVB receiver])
AC_ARG_ENABLE(
    [SPECTRACOM],
    [AS_HELP_STRING(
	[--enable-SPECTRACOM],
	[+ Spectracom 8170/Netclock/2 WWVB receiver]
    )],
    [ntp_ok=$enableval],
    [ntp_ok=$ntp_eac]
)
case "$ntp_ok" in
 yes)
    ntp_refclock=yes
    AC_DEFINE([CLOCK_SPECTRACOM], [1],
	[Spectracom 8170/Netclock/2 WWVB receiver])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])

AC_MSG_CHECKING([KSI/Odetics TPRO/S GPS receiver/IRIG interface])
AC_ARG_ENABLE(
    [TPRO],
    [AS_HELP_STRING(
	[--enable-TPRO],
	[s KSI/Odetics TPRO/S GPS receiver/IRIG interface]
    )],
    [ntp_ok=$enableval],
    [
	case "$ac_cv_header_sys_tpro_h" in
	 yes)
	    ntp_ok=$ntp_eac
	    ;;
	 *)
	    ntp_ok=no
	    ;;
	esac
    ]
)
case "$ntp_ok" in
 yes)
    ntp_refclock=yes
    AC_DEFINE([CLOCK_TPRO], [1],
	[KSI/Odetics TPRO/S GPS receiver/IRIG interface])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])
case "$ntp_ok$ac_cv_header_sys_tpro" in
 yesno) AC_MSG_WARN([*** But the expected answer is... no ***])
esac

# Not on a vax-dec-bsd
AC_MSG_CHECKING([Kinemetrics/TrueTime receivers])
AC_ARG_ENABLE(
    [TRUETIME],
    [AS_HELP_STRING(
	[--enable-TRUETIME],
	[s Kinemetrics/TrueTime receivers]
    )],
    [ntp_ok=$enableval],
    [
	case "$host" in
	 vax-dec-bsd)
	    ntp_ok=no
	    ;;
	 *)
	    ntp_ok=$ntp_eac
	    ;;
	esac
    ]
)    
case "$ntp_ok" in
 yes)
    ntp_refclock=yes
    AC_DEFINE([CLOCK_TRUETIME], [1], [Kinemetrics/TrueTime receivers])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])
case "$ntp_ok$host" in
 yesvax-dec-bsd) AC_MSG_WARN([*** But the expected answer is... no ***])
esac

AC_MSG_CHECKING([TrueTime 560 IRIG-B decoder])
AC_ARG_ENABLE(
    [TT560],
    [AS_HELP_STRING(
	[--enable-TT560],
	[- TrueTime 560 IRIG-B decoder]
    )],
    [ntp_ok=$enableval],
    [ntp_ok=no]
)
case "$ntp_ok" in
 yes)
    ntp_refclock=yes
    AC_DEFINE([CLOCK_TT560], [], [TrueTime 560 IRIG-B decoder?])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])

AC_MSG_CHECKING([Ultralink M320 WWVB receiver])
AC_ARG_ENABLE(
    [ULINK],
    [AS_HELP_STRING(
	[--enable-ULINK],
	[+ Ultralink WWVB receiver]
    )],
    [ntp_ok=$enableval],
    [ntp_ok=$ntp_eac]
)
case "$ntp_ok" in
 yes)
    ntp_refclock=yes
    AC_DEFINE([CLOCK_ULINK], [1], [Ultralink M320 WWVB receiver?])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])

AC_MSG_CHECKING([Spectracom TSYNC PCI timing board])
AC_ARG_ENABLE(
    [TSYNCPCI],
    [AS_HELP_STRING(
	[--enable-TSYNCPCI],
	[s Spectracom TSYNC timing board]
    )],
    [ntp_ok=$enableval],
    [
	case "$host" in
	 *-*-*linux*)
	    ntp_ok=$ntp_eac
	    ;;
	 *)
	    ntp_ok=no
	esac
    ]
)
case "$ntp_ok" in
 yes)
    ntp_refclock=yes
    AC_DEFINE([CLOCK_TSYNCPCI], [1], [Spectracom TSYNC timing board])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])

AC_MSG_CHECKING([WWV receiver])
AC_ARG_ENABLE(
    [WWV],
    [AS_HELP_STRING(
	[--enable-WWV],
	[s WWV Audio receiver]
    )],
    [ntp_ok=$enableval],
    [
	case "$ntp_eac$ntp_canaudio" in
	 *no*)	ntp_ok=no  ;;
	 *)	ntp_ok=yes ;;
	esac
    ]
)
case "$ntp_ok" in
 yes)
    ntp_refclock=yes
    AC_DEFINE([CLOCK_WWV], [1], [WWV audio driver])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])
case "$ntp_ok$ntp_canaudio" in
 yesno) AC_MSG_WARN([*** But the expected answer is... no ***])
esac

AC_MSG_CHECKING([for Zyfer receiver])
AC_ARG_ENABLE(
    [ZYFER],
    [AS_HELP_STRING(
	[--enable-ZYFER],
	[+ Zyfer GPStarplus receiver]
    )],
    [ntp_ok=$enableval],
    [ntp_ok=$ntp_eac]
)
case "$ntp_ok" in
 yes)
    ntp_refclock=yes
    AC_DEFINE([CLOCK_ZYFER], [1], [Zyfer GPStarplus])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])

AC_MSG_CHECKING([for default inclusion of all suitable PARSE clocks])
AC_ARG_ENABLE(
    [parse-clocks],
    [AS_HELP_STRING(
	[--enable-parse-clocks],
	[- include all suitable PARSE clocks:]
    )],
    [ntp_eapc=$enableval],
    [
	case "$ntp_eac" in
	 yes)	ntp_eapc=$ntp_canparse ;;
	 *)	ntp_eapc=no ;;
	esac
	# Delete the next line one of these days
	ntp_eapc=no
    ]
)
AC_MSG_RESULT($ntp_eapc)

case "$ntp_eac$ntp_eapc$ntp_canparse" in
 noyes*)
    AC_MSG_ERROR(["--enable-parse-clocks" requires "--enable-all-clocks".])
    ;;
 yesyesno)
    AC_MSG_ERROR([You said "--enable-parse-clocks" but PARSE isn't supported on this platform!])
    ;;
esac

ntp_libparse=no
ntp_parseutil=no
ntp_rawdcf=no

AC_MSG_CHECKING([Diem Computime Radio Clock])
AC_ARG_ENABLE(
    [COMPUTIME],
    [AS_HELP_STRING(
	[--enable-COMPUTIME],
	[s Diem Computime Radio Clock]
    )],
    [ntp_ok=$enableval],
    [ntp_ok=$ntp_eapc]
)
case "$ntp_ok" in
 yes)
    ntp_libparse=yes
    ntp_refclock=yes
    AC_DEFINE([CLOCK_COMPUTIME], [1], [Diems Computime Radio Clock?])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])
case "$ntp_ok$ntp_canparse" in
 yesno)
    AC_MSG_ERROR([That's a parse clock and this system doesn't support it!])
esac

AC_MSG_CHECKING([ELV/DCF7000 clock])
AC_ARG_ENABLE(
    [DCF7000],
    [AS_HELP_STRING(
	[--enable-DCF7000],
	[s ELV/DCF7000 clock]
    )],
    [ntp_ok=$enableval],
    [ntp_ok=$ntp_eapc]
)
case "$ntp_ok" in
 yes)
    ntp_libparse=yes
    ntp_refclock=yes
    AC_DEFINE([CLOCK_DCF7000], [1], [ELV/DCF7000 clock?])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])
case "$ntp_ok$ntp_canparse" in
 yesno)
    AC_MSG_ERROR([That's a parse clock and this system doesn't support it!])
esac

AC_MSG_CHECKING([HOPF 6021 clock])
AC_ARG_ENABLE(
    [HOPF6021],
    [AS_HELP_STRING(
	[--enable-HOPF6021],
	[s HOPF 6021 clock]
    )],
    [ntp_ok=$enableval],
    [ntp_ok=$ntp_eapc]
)
case "$ntp_ok" in
 yes)
    ntp_libparse=yes
    ntp_refclock=yes
    AC_DEFINE([CLOCK_HOPF6021], [1], [HOPF 6021 clock?])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])
case "$ntp_ok$ntp_canparse" in
 yesno)
    AC_MSG_ERROR([That's a parse clock and this system doesn't support it!])
esac

AC_MSG_CHECKING([Meinberg clocks])
AC_ARG_ENABLE(
    [MEINBERG],
    [AS_HELP_STRING(
	[--enable-MEINBERG],
	[s Meinberg clocks]
    )],
    [ntp_ok=$enableval],
    [ntp_ok=$ntp_eapc]
)
case "$ntp_ok" in
 yes)
    ntp_libparse=yes
    ntp_refclock=yes
    AC_DEFINE([CLOCK_MEINBERG], [1], [Meinberg clocks])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])
case "$ntp_ok$ntp_canparse" in
 yesno)
    AC_MSG_ERROR([That's a parse clock and this system doesn't support it!])
esac

AC_MSG_CHECKING([DCF77 raw time code])
AC_ARG_ENABLE(
    [RAWDCF],
    [AS_HELP_STRING(
	[--enable-RAWDCF],
	[s DCF77 raw time code]
    )],
    [ntp_ok=$enableval],
    [ntp_ok=$ntp_eapc]
)
case "$ntp_ok" in
 yes)
    ntp_libparse=yes
    ntp_parseutil=yes
    ntp_refclock=yes
    ntp_rawdcf=yes
    AC_DEFINE([CLOCK_RAWDCF], [1], [DCF77 raw time code])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])
case "$ntp_ok$ntp_canparse" in
 yesno)
    AC_MSG_ERROR([That's a parse clock and this system doesn't support it!])
esac

case "$ntp_rawdcf" in
 yes)
    AC_CACHE_CHECK([if we must enable parity for RAWDCF],
	[ntp_cv_rawdcf_parity],
	[
	    ans=no
	    case "$host" in
	     *-*-*linux*)
		ans=yes
		;;
	    esac
	    ntp_cv_rawdcf_parity=$ans
	]
    )
    case "$ntp_cv_rawdcf_parity" in
     yes)
	AC_DEFINE([RAWDCF_NO_IGNPAR], [1],
	    [Should we not IGNPAR (Linux)?]) ;;
    esac
esac

AC_MSG_CHECKING([RCC 8000 clock])
AC_ARG_ENABLE(
    [RCC8000],
    [AS_HELP_STRING(
	[--enable-RCC8000],
	[s RCC 8000 clock]
    )],
    [ntp_ok=$enableval],
    [ntp_ok=$ntp_eapc]
)
case "$ntp_ok" in
 yes)
    ntp_libparse=yes
    ntp_refclock=yes
    AC_DEFINE([CLOCK_RCC8000], [1], [RCC 8000 clock])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])
case "$ntp_ok$ntp_canparse" in
 yesno)
    AC_MSG_ERROR([That's a parse clock and this system doesn't support it!])
esac

AC_MSG_CHECKING([Schmid DCF77 clock])
AC_ARG_ENABLE(
    [SCHMID],
    [AS_HELP_STRING(
	[--enable-SCHMID ],
	[s Schmid DCF77 clock]
    )],
    [ntp_ok=$enableval],
    [ntp_ok=$ntp_eapc]
)
case "$ntp_ok" in
 yes)
    ntp_libparse=yes
    ntp_refclock=yes
    AC_DEFINE([CLOCK_SCHMID], [1], [Schmid DCF77 clock])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])
case "$ntp_ok$ntp_canparse" in
 yesno)
    AC_MSG_ERROR([That's a parse clock and this system doesn't support it!])
esac

AC_MSG_CHECKING([Trimble GPS receiver/TAIP protocol])
AC_ARG_ENABLE(
    [TRIMTAIP],
    [AS_HELP_STRING(
	[--enable-TRIMTAIP],
	[s Trimble GPS receiver/TAIP protocol]
    )],
    [ntp_ok=$enableval],
    [ntp_ok=$ntp_eapc]
)
case "$ntp_ok" in
 yes)
    ntp_libparse=yes
    ntp_refclock=yes
    AC_DEFINE([CLOCK_TRIMTAIP], [1],
	[Trimble GPS receiver/TAIP protocol])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])
case "$ntp_ok$ntp_canparse" in
 yesno)
    AC_MSG_ERROR([That's a parse clock and this system doesn't support it!])
esac

AC_MSG_CHECKING([Trimble GPS receiver/TSIP protocol])
AC_ARG_ENABLE(
    [TRIMTSIP],
    [AS_HELP_STRING(
	[--enable-TRIMTSIP],
	[s Trimble GPS receiver/TSIP protocol]
    )],
    [ntp_ok=$enableval],
    [ntp_ok=$ntp_eapc]
)
case "$ntp_ok" in
 yes)
    ntp_libparse=yes
    ntp_refclock=yes
    AC_DEFINE([CLOCK_TRIMTSIP], [1],
	[Trimble GPS receiver/TSIP protocol])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])
case "$ntp_ok$ntp_canparse" in
 yesno)
    AC_MSG_ERROR([That's a parse clock and this system doesn't support it!])
esac

AC_MSG_CHECKING([WHARTON 400A Series clock])
AC_ARG_ENABLE(
    [WHARTON],
    [AS_HELP_STRING(
	[--enable-WHARTON],
	[s WHARTON 400A Series clock]
    )],
    [ntp_ok=$enableval],
    [ntp_ok=$ntp_eapc]
)
case "$ntp_ok" in
 yes)
    ntp_libparse=yes
    ntp_refclock=yes
    AC_DEFINE([CLOCK_WHARTON_400A], [1], [WHARTON 400A Series clock])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])
case "$ntp_ok$ntp_canparse" in
 yesno)
    AC_MSG_ERROR([That's a parse clock and this system doesn't support it!])
esac

AC_MSG_CHECKING([VARITEXT clock])
AC_ARG_ENABLE(
    [VARITEXT],
    [AS_HELP_STRING(
	[--enable-VARITEXT],
	[s VARITEXT clock]
    )],
    [ntp_ok=$enableval],
    [ntp_ok=$ntp_eapc]
)
case "$ntp_ok" in
 yes)
    ntp_libparse=yes
    ntp_refclock=yes
    AC_DEFINE([CLOCK_VARITEXT], [1], [VARITEXT clock])
    ;;
esac
AC_MSG_RESULT([$ntp_ok])
case "$ntp_ok$ntp_canparse" in
 yesno)
    AC_MSG_ERROR([That's a parse clock and this system doesn't support it!])
esac

AC_MSG_CHECKING(SEL240X clock)
AC_ARG_ENABLE(SEL240X,
    AC_HELP_STRING([--enable-SEL240X], [s SEL240X clock]),
    [ntp_ok=$enableval], [ntp_ok=$ntp_eapc])
if test "$ntp_ok" = "yes"; then
    ntp_libparse=yes
    ntp_refclock=yes
    AC_DEFINE(CLOCK_SEL240X, 1, [SEL240X protocol])
fi
AC_MSG_RESULT($ntp_ok)
case "$ntp_ok$ntp_canparse" in
 yesno)
    AC_MSG_ERROR(That's a parse clock and this system doesn't support it!)
    ;;
esac

AC_SUBST([LIBPARSE])
AC_SUBST([MAKE_LIBPARSE])
AC_SUBST([MAKE_LIBPARSE_KERNEL])
AC_SUBST([MAKE_CHECK_Y2K])

AC_MSG_CHECKING([if we need to make and use the parse libraries])
ans=no
case "$ntp_libparse" in
 yes)
    ans=yes
    AC_DEFINE([CLOCK_PARSE], [1], [PARSE driver interface])
    LIBPARSE=../libparse/libparse.a
    MAKE_LIBPARSE=libparse.a
    # HMS: check_y2k trips the 34 year problem now...
    false && MAKE_CHECK_Y2K=check_y2k
esac
AC_MSG_RESULT([$ans])

NTP_OPENSSL

NTP_CRYPTO_RAND

# if we are using OpenSSL (--with-crypto), by default Autokey is enabled
AC_MSG_CHECKING([if we want to include NTP Autokey protocol support])
AC_ARG_ENABLE(
    [autokey],
    AS_HELP_STRING(
	[--enable-autokey],
	[+ support NTP Autokey protocol]
	),
    [ntp_autokey=$enableval],
    [ntp_autokey=$ntp_openssl]
)
case "$ntp_autokey" in
 no)
    ;;
 *)
    case "$ntp_openssl" in
     no)
	AC_MSG_WARN([Disabling Autokey, --enable-autokey requires --with-crypto.])
	ntp_autokey=no
	;;
     *)
	AC_DEFINE([AUTOKEY], [1], [Support NTP Autokey protocol?])
	ntp_autokey=yes
	;;
    esac
    ;;
esac
AC_MSG_RESULT([$ntp_autokey])

AC_SUBST([MAKE_CHECK_LAYOUT])
AC_MSG_CHECKING([if we want to run check-layout])
case "$cross_compiling$PATH_PERL" in
 no/*)
    MAKE_CHECK_LAYOUT=check-layout
    ans=yes
    ;;
 *)
    ans=no
    ;;
esac
AC_MSG_RESULT([$ans])

AC_SUBST([TESTDCF])
AC_SUBST([DCFD])
AC_MSG_CHECKING([if we can make dcf parse utilities])
ans=no
case "$ntp_parseutil" in
 yes)
    case "$host" in
     *-*-sunos4*|*-*-solaris2*|*-*-*linux*|*-*-netbsd*)
	ans="dcfd testdcf"
	DCFD=dcfd
	TESTDCF=testdcf
    esac
    ;;
esac
AC_MSG_RESULT([$ans])

AC_SUBST([MAKE_PARSEKMODULE])
AC_MSG_CHECKING([if we can build kernel streams modules for parse])
ans=no
case "$ntp_parseutil$ac_cv_header_sys_stropts_h" in
 yesyes)
    case "$host" in
     sparc-*-sunos4*)
        case "$ntp_cv_var_kernel_pll" in
	yes)
	    AC_DEFINE([PPS_SYNC], [1], [PARSE kernel PLL PPS support])
	    ;;
	esac
	ans=parsestreams
	MAKE_PARSEKMODULE=parsestreams.loadable_module.o
	;;
     sparc-*-solaris2*)
	ans=parsesolaris
	MAKE_PARSEKMODULE=parse
	AC_CHECK_HEADERS([strings.h])
	;;
    esac
    ;;
esac
AC_MSG_RESULT([$ans])

AC_MSG_CHECKING([if we need basic refclock support])
case "$ntp_refclock" in
 yes)
    AC_DEFINE([REFCLOCK], [1], [Basic refclock support?])
    ;;
esac
AC_MSG_RESULT($ntp_refclock)

dnl Things that can be made in clockstuff
AC_SUBST([PROPDELAY], [propdelay])
AC_SUBST([CHUTEST]) dnl needs work to compile

AC_SUBST([MAKE_ADJTIMED])
AC_MSG_CHECKING([if we want HP-UX adjtimed support])
case "$host" in
 *-*-hpux[[56789]]*)
    ans=yes
    ;;
 *) ans=no
    ;;
esac
case "$ans" in
 yes)
    MAKE_ADJTIMED=adjtimed
    AC_DEFINE([NEED_HPUX_ADJTIME], [1],
	[Do we need HPUX adjtime() library support?])
    ;;
 *) ADJTIMED_DB=
    ADJTIMED_DL=
    ADJTIMED_DS=
    ADJTIMED_MS=
    ;;
esac
AC_MSG_RESULT([$ans])

AC_MSG_CHECKING([if we want QNX adjtime support])
case "$host" in
 *-*-qnx*)
    ans=yes
    ;;
 *) ans=no
    ;;
esac
case "$ans" in
 yes)
    AC_DEFINE([NEED_QNX_ADJTIME], [1],
	[Do we need the qnx adjtime call?])
    ;;
esac
AC_MSG_RESULT([$ans])

AC_MSG_CHECKING([if we can read kmem])

#  the default is to enable it if the system has the capability

case "$ac_cv_func_nlist$ac_cv_func_K_open$ac_cv_func_kvm_open" in
 *yes*)
    ans=yes
    ;;
 *) ans=no
    ;;
esac

case "$host" in
 *-*-domainos)	# Won't be found...
    ans=no
    ;;
 *-*-hpux*)
    #ans=no
    ;;
 *-*-irix[[456]]*)
    ans=no
    ;;
 *-*-*linux*)
    ans=no
    ;;
 *-*-winnt3.5)
    ans=no
    ;;
 *-*-unicosmp*)
    ans=no
    ;;
esac

# --enable-kmem / --disable-kmem controls if present
AC_ARG_ENABLE(
    [kmem],
    [AS_HELP_STRING(
	[--enable-kmem],
	[s read /dev/kmem for tick and/or tickadj]
    )],
    [ans=$enableval]
)

AC_MSG_RESULT([$ans])

case "$ans" in
 yes)
    can_kmem=yes
    ;;
 *)
    can_kmem=no
    AC_DEFINE([NOKMEM], [1], [Should we NOT read /dev/kmem?])
esac


AC_MSG_CHECKING([if adjtime is accurate])

# target-dependent defaults

case "$host" in
 i386-sequent-ptx*)
    ans=no
    ;;
 i386-unknown-osf1*)
    ans=yes
    ;;
 mips-sgi-irix[[456]]*)
    ans=yes
    ;;
 *-fujitsu-uxp*)
    ans=yes
    ;;
 *-ibm-aix[[4-9]]*)
    # XXX only verified thru AIX6.
    ans=yes
    ;;
 *-*-*linux*)
    ans=yes
    ;;
 *-*-solaris2.[[01]])
    ans=no
    ;;
 *-*-solaris2*)
    ans=yes
    ;;
 *-*-unicosmp*)
    ans=yes
    ;;
 *) ans=no
    ;;
esac

# --enable-accurate-adjtime / --disable-accurate-adjtime
# override the default
AC_ARG_ENABLE(
    [accurate-adjtime],
    [AS_HELP_STRING(
	[--enable-accurate-adjtime],
	[s the adjtime() call is accurate]
    )],
    [ans=$enableval]
)

AC_MSG_RESULT([$ans])

case "$ans" in
 yes)
    AC_DEFINE([ADJTIME_IS_ACCURATE], [1], [Is adjtime() accurate?])
    adjtime_is_accurate=yes
    ;;
 *)
    adjtime_is_accurate=no
    ;;
esac

AC_CACHE_CHECK(
    [the name of 'tick' in the kernel],
    [ntp_cv_nlist_tick],
    [
	ans=_tick
	case "$host" in
	 m68*-hp-hpux*) # HP9000/300?
	    ans=_old_tick
	    ;;
	 *-apple-aux[[23]]*)
	    ans=tick
	    ;;
	 *-hp-hpux*)
	    ans=old_tick
	    ;;
	 *-ibm-aix[[3-9]]*)
	    # XXX only verified thru AIX6.
	    ans=no
	    ;;
	 *-*-mpeix*)
	    ans=no
	    ;;
	 *-*-ptx*)
	    ans=tick
	    ;;
	 *-*-sco3.2v[[45]]*)
	    ans=no
	    ;;
	 *-*-solaris2*)
	    ans=nsec_per_tick
	    ;;
	 *-*-sysv4*)
	    ans=tick
	    ;;
	esac
	ntp_cv_nlist_tick=$ans
    ]
)
case "$ntp_cv_nlist_tick" in
 ''|no)
    ;;	# HMS: I think we can only get 'no' here...
 *)
    AC_DEFINE_UNQUOTED([K_TICK_NAME], ["$ntp_cv_nlist_tick"],
	[What is the name of TICK in the kernel?])
esac

AC_CACHE_CHECK(
    [for the units of 'tick'],
    [ntp_cv_tick_nano],
    [
	ans=usec
	case "$host" in
	 *-*-solaris2*)
	    ans=nsec
	    ;;
	esac
	ntp_cv_tick_nano=$ans
    ]
)
case "$ntp_cv_tick_nano" in
 nsec)
    AC_DEFINE([TICK_NANO], [1], [Is K_TICK_NAME in nanoseconds?])
esac

AC_CACHE_CHECK(
    [the name of 'tickadj' in the kernel],
    [ntp_cv_nlist_tickadj],
    [
	ans=_tickadj
	case "$host" in
	 m68*-hp-hpux*) # HP9000/300?
	    ans=_tickadj
	    ;;
	 *-apple-aux[[23]]*)
	    ans=tickadj
	    ;;
	 *-hp-hpux10*)
	    ans=no
	    ;;
	 *-hp-hpux9*)
	    ans=no
	    ;;
	 *-hp-hpux*)
	    ans=tickadj
	    ;;
	 *-*-aix*)
	    ans=tickadj
	    ;;
	 *-*-mpeix*)
	    ans=no
	    ;;
	 *-*-ptx*)
	    ans=tickadj
	    ;;
	 *-*-sco3.2v4*)
	    ans=no
	    ;;
	 *-*-sco3.2v5.0*)
	    ans=clock_drift
	    ;;
	 *-*-solaris2*)
	    ans=no	# hrestime_adj
	    ;;
	 *-*-sysv4*)
	    ans=tickadj
	    ;;
	esac
	ntp_cv_nlist_tickadj=$ans
    ]
)
case "$ntp_cv_nlist_tickadj" in
 ''|no)
    ;;	# HMS: I think we can only get 'no' here...
 *)
    AC_DEFINE_UNQUOTED([K_TICKADJ_NAME], ["$ntp_cv_nlist_tickadj"],
	[What is the name of TICKADJ in the kernel?])
esac

AC_CACHE_CHECK(
    [for the units of 'tickadj'],
    [ntp_cv_tickadj_nano],
    [
	ans=usec
	case "$host" in
	 *-*-solaris2*)
	    ans=nsec
	    ;;
	esac
	ntp_cv_tickadj_nano=$ans
    ]
)
case "$ntp_cv_tickadj_nano" in
 nsec)
    AC_DEFINE([TICKADJ_NANO], [1], [Is K_TICKADJ_NAME in nanoseconds?])
esac

AC_CACHE_CHECK(
    [half-heartedly for 'dosynctodr' in the kernel],
    [ntp_cv_nlist_dosynctodr],
    [
	case "$host" in
	 *-apple-aux[[23]]*)
	    ans=no
	    ;;
	 *-sni-sysv*)
	    ans=dosynctodr
	    ;;
	 *-stratus-vos)
	    ans=no
	    ;;
	 *-*-aix*)
	    ans=dosynctodr
	    ;;
	 *-*-hpux*)
	    ans=no
	    ;;
	 *-*-mpeix*)
	    ans=no
	    ;;
	 *-*-nextstep*)
	    ans=_dosynctodr
	    ;;
	 *-*-ptx*)
	    ans=doresettodr
	    ;;
	 *-*-sco3.2v4*)
	    ans=no
	    ;;
	 *-*-sco3.2v5*)
	    ans=track_rtc
	    ;;
	 *-*-solaris2*)
	    ans=dosynctodr
	    ;;
	 *-*-sysv4*)
	    ans=doresettodr
	    ;;
	 *)
	    ans=_dosynctodr
	    ;;
	esac
	ntp_cv_nlist_dosynctodr=$ans
    ]
)
case "$ntp_cv_nlist_dosynctodr" in
 no)
    ;;
 *)
    AC_DEFINE_UNQUOTED([K_DOSYNCTODR_NAME], ["$ntp_cv_nlist_dosynctodr"],
	[What is (probably) the name of DOSYNCTODR in the kernel?])
    ;;
esac

AC_CACHE_CHECK(
    [half-heartedly for 'noprintf' in the kernel],
    [ntp_cv_nlist_noprintf],
    [
	case "$host" in
	 *-apple-aux[[23]]*)
	    ans=no
	    ;;
	 *-sni-sysv*)
	    ans=noprintf
	    ;;
	 *-stratus-vos)
	    ans=no
	    ;;
	 *-*-aix*)
	    ans=noprintf
	    ;;
	 *-*-hpux*)
	    ans=no
	    ;;
	 *-*-mpeix*)
	    ans=no
	    ;;
	 *-*-ptx*)
	    ans=noprintf
	    ;;
	 *-*-nextstep*)
	    ans=_noprintf
	    ;;
	 *-*-solaris2*)
	    ans=noprintf
	    ;;
	 *-*-sysv4*)
	    ans=noprintf
	    ;;
	 *)
	    ans=_noprintf
	    ;;
	esac
	ntp_cv_nlist_noprintf=$ans
    ]
)
case "$ntp_cv_nlist_noprintf" in
 no)
    ;;
 *)
    AC_DEFINE_UNQUOTED([K_NOPRINTF_NAME], ["$ntp_cv_nlist_noprintf"],
	[What is (probably) the name of NOPRINTF in the kernel?])
    ;;
esac

dnl The tick/tickadj sections were written by Skippy, who never learned
dnl that it's impolite (horridly gross) to show your guts in public.

dnl	tick		tickadj
dnl	10000		80	    Unixware
dnl	1000000L/hz	tick/16     (Solaris,UXPV,HPUX) && ADJTIME_IS_ACCURATE
dnl	10000		150	    sgi IRIX
dnl	1000000L/hz	1000	    RS6000 && NOKMEM
dnl	1000000L/hz	668	    DOMAINOS && NOKMEM
dnl	1000000L/hz	500/HZ	    other && NOKMEM
dnl	txc.tick	1	    Linux
dnl	(every / 10)	50	    WinNT - tickadj is roughly 500/hz
dnl	1000000L/hz	(nlist)     (Solaris && !ADJTIME_IS_ACCURATE),
dnl				    (RS6000 && !NOKMEM), SINIX MIPS

dnl But we'll only use these "values" if we can't find anything else.

AC_MSG_CHECKING([for a default value for 'tick'])

# target-dependent default for tick

case "$host" in
 *-*-pc-cygwin*)
    AC_MSG_ERROR([tick needs work for cygwin])
    ;;
 *-univel-sysv*)
    ans=10000
    ;;
 *-*-irix*)
    ans=10000
    ;;
 *-*-*linux*)
    ans=txc.tick
    ;;
 *-*-mpeix*)
    ans=no
    ;;
 *-*-winnt3.5)
    ans='(every / 10)'
    ;;
 *-*-unicosmp*)
    ans=10000
    ;;
 *)
    ans='1000000L/hz'
    ;;
esac

AC_ARG_ENABLE(
    [tick],
    [AS_HELP_STRING(
	[--enable-tick=VALUE],
	[s force a value for 'tick']
    )],
    [ans=$enableval]
)

AC_MSG_RESULT([$ans])

case "$ans" in
 ''|no)
    ;;	# HMS: I think we can only get 'no' here...
 *)
    AC_DEFINE_UNQUOTED([PRESET_TICK], [$ans],
	[Preset a value for 'tick'?])
esac

AC_MSG_CHECKING([for a default value for 'tickadj'])

# target-specific default
ans='500/hz'
case "$host" in
 *-fujitsu-uxp*)
    case "$adjtime_is_accurate" in
     yes)
	ans='tick/16'
    esac
    ;;
 *-univel-sysv*)
    ans=80
    ;;
 *-*-aix*)
    case "$can_kmem" in
     no)
	ans=1000
	;;
    esac
    ;;
 *-*-domainos)	# Skippy: won't be found...
    case "$can_kmem" in
     no)
	ans=668
	;;
    esac
    ;;
 *-*-hpux*)
    case "$adjtime_is_accurate" in
     yes)
	ans='tick/16'
	;;
    esac
    ;;
 *-*-irix*)
    ans=150
    ;;
 *-*-mpeix*)
    ans=no
    ;;
 *-*-sco3.2v5.0*)
    ans=10000L/hz
    ;;
 *-*-winnt3.5)
    ans=50
    ;;
 *-*-unicosmp*)
    ans=150
    ;;
esac

AC_ARG_ENABLE(
    [tickadj],
    [AS_HELP_STRING(
	[--enable-tickadj=VALUE],
	[s force a value for 'tickadj']
    )],
    [ans=$enableval]
)

AC_MSG_RESULT([$ans])

default_tickadj=$ans

case "$default_tickadj" in
 ''|no)
    ;;	# HMS: I think we can only get 'no' here...
 *)
    AC_DEFINE_UNQUOTED([PRESET_TICKADJ], [$default_tickadj],
	[Preset a value for 'tickadj'?]) ;;
esac

# Newer versions of ReliantUNIX round adjtime() values down to
# 1/100s (system tick). Sigh ...
# Unfortunately, there is no easy way to know if particular release
# has this "feature" or any obvious way to test for it.
case "$host" in
 mips-sni-sysv4*)
    AC_DEFINE([RELIANTUNIX_CLOCK], [1],
	[Do we want the ReliantUNIX clock hacks?])
esac

case "$host" in
 *-*-sco3.2v5*)
    AC_DEFINE([SCO5_CLOCK], [1], [Do we want the SCO clock hacks?])
esac

ntp_cv_make_tickadj=yes
case "$can_kmem$ac_cv_var_tick$default_tickadj" in
 nonono)	# Don't read KMEM, no presets.  Bogus.
    AC_MSG_WARN([Can't read kmem, no PRESET_TICK or PRESET_TICKADJ.  No tickadj.])
    ntp_cv_make_tickadj=no
    ;;
 nono*)		# Don't read KMEM, no PRESET_TICK but PRESET_TICKADJ.  Bogus.
    AC_MSG_WARN([Can't read kmem but no PRESET_TICK.  No tickadj.])
    ntp_cv_make_tickadj=no
    ;;
 no*no)		# Don't read KMEM, PRESET_TICK but no PRESET_TICKADJ.  Bogus.
    AC_MSG_WARN([Can't read kmem but no PRESET_TICKADJ.  No tickadj.])
    ntp_cv_make_tickadj=no
    ;;
 no*)		# Don't read KMEM, PRESET_TICK and PRESET_TICKADJ.  Cool.
    ;;
 yesnono)	# Read KMEM, no presets.  Cool.
    ;;
 yesno*)	# Read KMEM, no PRESET_TICK but PRESET_TICKADJ.  Bogus.
    AC_MSG_WARN([PRESET_TICKADJ is defined but not PRESET_TICK.  Please report this.])
    ;;
 yes*no)	# Read KMEM, PRESET_TICK but no PRESET_TICKADJ.  Cool.
    ;;
 yes*)		# READ KMEM, PRESET_TICK and PRESET_TICKADJ.
    ;;
 *)		# Generally bogus.
    AC_MSG_ERROR([This shouldn't happen.])
    ;;
esac

AC_SUBST(MAKE_NTPTIME)
AC_CACHE_CHECK([if we want and can make the ntptime utility], ac_cv_make_ntptime,
[case "$host" in
 *) case "$ntp_cv_struct_ntptimeval$ntp_cv_var_kernel_pll" in
     yesyes)
	ans=yes
	;;
     *)
	ans=no
	;;
    esac
    ;;
esac
ac_cv_make_ntptime=$ans])
case "$ac_cv_make_ntptime" in
 yes)
    MAKE_NTPTIME=ntptime
    ;;
 *)
    NTPTIME_DB=
    NTPTIME_DL=
    NTPTIME_DS=
    NTPTIME_MS=
    ;;
esac

AC_SUBST([MAKE_TICKADJ])
case "$host" in
 mips-sni-sysv4*)
    # tickadj is pretty useless on newer versions of ReliantUNIX
    # Do not bother
    ntp_cv_make_tickadj=no
    ;;
 *-*-irix*)
    ntp_cv_make_tickadj=no
    ;;
 *-*-solaris2*)
    # DLM says tickadj is a no-no starting with solaris2.5
    case "$host" in
     *-*-solaris2.1[[0-9]]*)
	ntp_cv_make_tickadj=no
	;;
     *-*-solaris2.[[0-4]]*) ;;
     *) ntp_cv_make_tickadj=no ;;
    esac
    ;;
 *-*-unicosmp*)
    ntp_cv_make_tickadj=no
    ;;
esac

#
# Despite all the above, we always make tickadj.  Setting
# ntp_cv_make_tickadj before AC_CACHE_CHECK will cause a false
# report that the configuration variable was cached.  It may
# be better to simply remove the hunk above, I did not want
# to remove it if there is hope it will be used again.
#
AS_UNSET([ntp_cv_make_tickadj])

AC_CACHE_CHECK(
    [if we want and can make the tickadj utility],
    [ntp_cv_make_tickadj],
    [ntp_cv_make_tickadj=yes]
)
case "$ntp_cv_make_tickadj" in
 yes)
    MAKE_TICKADJ=tickadj
    ;;
 *)
    CALC_TICKADJ_DB=
    CALC_TICKADJ_DL=
    CALC_TICKADJ_DS=
    CALC_TICKADJ_MS=
    TICKADJ_DB=
    TICKADJ_DL=
    TICKADJ_DS=
    TICKADJ_MS=
    ;;
esac

AC_SUBST([MAKE_TIMETRIM])
AC_CACHE_CHECK(
    [if we want and can make the timetrim utility],
    [ntp_cv_make_timetrim],
    [
	case "$host" in
	 *-*-irix*)
	    ntp_cv_make_timetrim=yes
	    ;;
	 *-*-unicosmp*)
	    ntp_cv_make_timetrim=yes
	    ;;
	 *)
	    ntp_cv_make_timetrim=no
	    ;;
	esac
    ]
)
case "$ntp_cv_make_timetrim" in
 yes)
    MAKE_TIMETRIM=timetrim
    ;;
 *) TIMETRIM_DB=
    TIMETRIM_DL=
    TIMETRIM_DS=
    TIMETRIM_MS=
    ;;
esac

AC_SUBST([MAKE_LIBNTPSIM])
AC_SUBST([MAKE_NTPDSIM])

AC_MSG_CHECKING([if we want to build the NTPD simulator])
AC_ARG_ENABLE(
    [simulator],
    [AS_HELP_STRING(
	[--enable-simulator],
	[- build/install the NTPD simulator?]
    )],
    [ans=$enableval],
    [ans=no]
)
AC_MSG_RESULT([$ans])
case "$ans" in
 yes)
    MAKE_NTPDSIM=ntpdsim
    MAKE_LIBNTPSIM=libntpsim.a
    ;;
 *)
    NTPDSIM_DB=
    NTPDSIM_DL=
    NTPDSIM_DS=
    NTPDSIM_MS=
    ;;
esac

case "$build" in
 $host)
    ;;
 *) case "$host" in
     *-*-vxworks*)
	LDFLAGS="$LDFLAGS -r"
	;;
    esac
    ;;
esac

NTP_WITHSNTP

AC_MSG_CHECKING([if we want to build ntpsnmpd])
AC_ARG_WITH(
    [ntpsnmpd],
    [AS_HELP_STRING(
	[--with-ntpsnmpd],
	[s Build ntpsnmpd MIB agent?]
    )],
    [ans=$withval],
    [
	case "$PATH_NET_SNMP_CONFIG" in
	 /*)	ans=yes ;;
	 *)	ans=no  ;;
	esac
    ]
)
AC_MSG_RESULT([$ans])
case "$ans" in
 yes)
    case "$PATH_NET_SNMP_CONFIG" in
     /*)
	SNMP_LIBS=`$PATH_NET_SNMP_CONFIG --agent-libs`
	# Bug 2815.  This is a bit of a hack, but it works...
	case "$ntp_cv_net_snmp_version" in
	 5.3*)	SNMP_LIBS=`echo $SNMP_LIBS | $SED -e 's/-lnetsnmpagent/-lnetsnmpagent -lnetsnmpmibs/'`
		;;
	esac
	AC_SUBST([SNMP_LIBS])
	# HMS: we really want to separate CPPFLAGS and CFLAGS
	foo=`$PATH_NET_SNMP_CONFIG --cflags`
	SNMP_CPPFLAGS=
	SNMP_CFLAGS=
	for i in $foo; do
	    case "$i" in
	     -D*|-U*|-I*)
		SNMP_CPPFLAGS="$SNMP_CPPFLAGS $i"
		;;
	    *)	SNMP_CFLAGS="$SNMP_CFLAGS $i"
		;;
	    esac
	done
	AC_SUBST([SNMP_CPPFLAGS])
	AC_SUBST([SNMP_CFLAGS])

	save_CFLAGS=$CFLAGS
	save_CPPFLAGS=$CPPFLAGS
	save_LIBS=$LIBS
	CFLAGS=$SNMP_CFLAGS
	CPPFLAGS=$SNMP_CPPFLAGS

	AC_CHECK_HEADER(
	    [net-snmp/net-snmp-config.h],
	    [MAKE_NTPSNMPD=ntpsnmpd],
	    [AC_MSG_WARN([net-snmp-config present but net-snmp headers are not available!])]
	)

	# Do this last, as we're messing up LIBS.
	# check -lnetsnmp for netsnmp_daemonize
	LIBS=`$PATH_NET_SNMP_CONFIG --libs`
	AC_CHECK_LIB(
	    [netsnmp],
	    [netsnmp_daemonize],
	    [ans=yes],
	    [ans=no]
	)
	case "$ans" in
	 no)
	    AC_DEFINE([NEED_NETSNMP_DAEMONIZE], [1],
		[We need to provide netsnmp_daemonize()])
	esac
	
	CFLAGS=$save_CFLAGS
	AS_UNSET([save_CFLAGS])
	CPPFLAGS=$save_CPPFLAGS
	AS_UNSET([save_CPPFLAGS])
	LIBS=$save_LIBS
	AS_UNSET([save_LIBS])
	;;
     *) 
	AC_MSG_WARN([Cannot build ntpsnmpd - net-snmp-config cannot be found])
	;;
    esac
    ;;
esac
AC_SUBST([MAKE_NTPSNMPD])

case "$MAKE_NTPSNMPD" in
 '')
    NTPSNMPD_DB=
    NTPSNMPD_DL=
    NTPSNMPD_DS=
    NTPSNMPD_MS=
    ;;
esac

AC_MSG_CHECKING([if we should always slew the time])

# target-specific defaults

case "$host" in
 *-apple-aux[[23]]*)
    ans=yes
    ;;
 *-*-bsdi[[012]]*)
    ans=no
    ;;
 *-*-bsdi*)
    ans=yes
    ;;
 *-*-openvms*)	# HMS: won't be found
    ans=yes
    ;;
 *) ans=no
    ;;
esac

# --enable-slew-always / --disable-slew-always overrides default

AC_ARG_ENABLE(
    [slew-always],
    [AS_HELP_STRING(
	[--enable-slew-always],
	[s always slew the time]
    )],
    [ans=$enableval]
)

AC_MSG_RESULT([$ans])

case "$ans" in
 yes)
    AC_DEFINE([SLEWALWAYS], [1], [Slew always?])
esac

AC_MSG_CHECKING([if we should step and slew the time])

case "$host" in
 *-sni-sysv*)
    ans=yes
    ;;
 *-stratus-vos)
    ans=no
    ;;
 *-univel-sysv*)
    ans=no
    ;;
 *-*-ptx*)
    ans=yes
    ;;
 *-*-solaris2.1[[0-9]]*)
    ans=no
    ;;
 *-*-solaris2.[[012]]*)
    ans=yes
    ;;
 *-*-sysv4*)	# HMS: Does this catch Fujitsu UXP?
    ans=yes
    ;;
 *) ans=no
    ;;
esac

AC_ARG_ENABLE(
    [step-slew],
    [AS_HELP_STRING(
	[--enable-step-slew],
	[s step and slew the time]
    )],
    [ans=$enableval]
)

AC_MSG_RESULT([$ans])

case "$ans" in
 yes)
    AC_DEFINE([STEP_SLEW], [1], [Step, then slew the clock?])
esac

AC_MSG_CHECKING([if ntpdate should step the time])

case "$host" in
 *-apple-aux[[23]]*)
    ans=yes
    ;;
 *) ans=no
    ;;
esac

AC_ARG_ENABLE(
    [ntpdate-step],
    [AS_HELP_STRING(
	[--enable-ntpdate-step],
	[s if ntpdate should step the time]
    )],
    [ans=$enableval]
)

AC_MSG_RESULT([$ans])

case "$ans" in
 yes)
    AC_DEFINE([FORCE_NTPDATE_STEP], [1],
	[force ntpdate to step the clock if !defined(STEP_SLEW) ?])
esac


AC_MSG_CHECKING([if we should sync TODR clock every hour])

case "$host" in
 *-*-nextstep*)
    ans=yes
    ;;
 *-*-openvms*)	# HMS: won't be found
    ans=yes
    ;;
 *)
    ans=no
    ;;
esac

AC_ARG_ENABLE(
    [hourly-todr-sync],
    [AS_HELP_STRING(
	[--enable-hourly-todr-sync],
	[s if we should sync TODR hourly]
    )],
    [ans=$enableval]
)

AC_MSG_RESULT([$ans])

case "$ac_cv_var_sync_todr" in
 yes)
    AC_DEFINE([DOSYNCTODR], [1], [synch TODR hourly?]) ;;
esac


AC_MSG_CHECKING([if we should avoid kernel FLL bug])

case "$host" in
 *-*-solaris2.6)
    unamev=`uname -v`
    case "$unamev" in
     Generic_105181-*)
	old_IFS="$IFS"
	IFS="-"
	set $unamev
	IFS="$old_IFS"
	if test "$2" -ge 17
	then
	    # Generic_105181-17 and higher
	    ans=no
	else
	    ans=yes
	fi
	;;
     *)
	ans=yes
	;;
    esac
    ;;
 *-*-solaris2.7)
    unamev=`uname -v`
    case "$unamev" in
     Generic_106541-*)
	old_IFS="$IFS"
	IFS="-"
	set $unamev
	IFS="$old_IFS"
	if test "$2" -ge 07
	then
	    # Generic_106541-07 and higher
	    ans=no
	else
	    ans=yes
	fi
	;;
     *)
	ans=yes
	;;
    esac
    ;;
 *)
    ans=no
    ;;
esac

AC_ARG_ENABLE(
    [kernel-fll-bug],
    [AS_HELP_STRING(
	[--enable-kernel-fll-bug],
	[s if we should avoid a kernel FLL bug]
    )],
    [ans=$enableval]
)

AC_MSG_RESULT([$ans])

case "$ans" in
 yes)
    AC_DEFINE([KERNEL_FLL_BUG], [1], [Does the kernel have an FLL bug?])
esac


AC_MSG_CHECKING([if we want new session key behavior])
AC_ARG_ENABLE(
    [bug1243-fix],
    [AS_HELP_STRING(
	[--enable-bug1243-fix],
	[+ use unmodified autokey session keys]
    )],
    [ans=$enableval],
    [ans=yes]
)
AC_MSG_RESULT([$ans])
case "$ans" in
 no)
    AC_DEFINE([DISABLE_BUG1243_FIX], [1],
	[use old autokey session key behavior?])
esac


AC_MSG_CHECKING([if we want the explicit 127.0.0.0/8 martian filter])
AC_ARG_ENABLE(
    [bug3020-fix],
    [AS_HELP_STRING(
	[--enable-bug3020-fix],
	[+ Provide the explicit 127.0.0.0/8 martian filter]
    )],
    [ans=$enableval],
    [ans=yes]
)
AC_MSG_RESULT([$ans])
case "$ans" in
 yes)
    AC_DEFINE([ENABLE_BUG3020_FIX], [1],
	[Provide the explicit 127.0.0.0/8 martian filter?])
esac


AC_MSG_CHECKING([if we should use the IRIG sawtooth filter])

case "$host" in
 *-*-solaris2.[[89]])
    ans=yes
    ;;
 *-*-solaris2.1[[0-9]]*)
    ans=yes
    ;;
 *) ans=no
    ;;
esac

AC_ARG_ENABLE(
    [irig-sawtooth],
    [AS_HELP_STRING(
	[--enable-irig-sawtooth],
	[s if we should enable the IRIG sawtooth filter]
    )],
    [ans=$enableval]
)

AC_MSG_RESULT([$ans])

case "$ans" in
 yes)
    AC_DEFINE([IRIG_SUCKS], [1],
	[Should we use the IRIG sawtooth filter?])
esac

AC_MSG_CHECKING([if we should enable NIST lockclock scheme])
AC_ARG_ENABLE(
	[nist],
	[AS_HELP_STRING(
	    [--enable-nist],
	    [- if we should enable the NIST lockclock scheme]
	)],
	[ans=$enableval],
	[ans=no]
)

AC_MSG_RESULT([$ans])

case "$ans" in
 yes)
    AC_DEFINE([LOCKCLOCK], [1],
	[Should we align with the NIST lockclock scheme?]) ;;
esac

AC_MSG_CHECKING([if we want support for Samba's signing daemon])
AC_ARG_ENABLE(
    [ntp-signd],
    [AS_HELP_STRING(
	[--enable-ntp-signd],
	[- Provide support for Samba's signing daemon, =/var/run/ntp_signd]
    )],
    [ans=$enableval],
    [ans=no]
)

AC_MSG_RESULT([$ans])

case "$ans" in
 no)
    ntp_signd_path=
    ;;
 yes)
    ntp_signd_path=/var/run/ntp_signd
    ;;
 *)
    ntp_signd_path="$ans"
esac

case "$ntp_signd_path" in
 '')
    ;;
 *)
    AC_DEFINE([HAVE_NTP_SIGND], [1],
	[Do we want support for Samba's signing daemon?])
    AC_DEFINE_UNQUOTED([NTP_SIGND_PATH], ["$ntp_signd_path"],
	[Path to sign daemon rendezvous socket])
    ;;
esac

AC_CHECK_HEADERS([libscf.h])
LSCF=
case "$ac_cv_header_libscf_h" in
 yes)
    LSCF='-lscf'
esac
AC_SUBST([LSCF])

NTP_IPV6


#
# Look for a sysctl call to get the list of network interfaces.
#
AC_CACHE_CHECK(
    [for interface list sysctl],
    [ntp_cv_iflist_sysctl],
    [AC_PREPROC_IFELSE(
	[AC_LANG_SOURCE([
	    #include <sys/param.h>
	    #include <sys/sysctl.h>
	    #include <sys/socket.h>
	    #ifndef NET_RT_IFLIST
	    # error
	    #endif
	])],
	[ntp_cv_iflist_sysctl=yes],
	[ntp_cv_iflist_sysctl=no]
    )]
)
case "$ntp_cv_iflist_sysctl" in
 yes)
    AC_DEFINE([HAVE_IFLIST_SYSCTL], [1], [have iflist_sysctl?])
esac

###

AC_MSG_CHECKING([if we want the saveconfig mechanism])
AC_ARG_ENABLE(
    [saveconfig],
    [AS_HELP_STRING(
	[--enable-saveconfig],
	[+ saveconfig mechanism]
    )],
    [ntp_ok=$enableval],
    [ntp_ok=yes]
)
ntp_saveconfig_enabled=0
case "$ntp_ok" in
 yes)
    ntp_saveconfig_enabled=1
    AC_DEFINE([SAVECONFIG], [1], [saveconfig mechanism])
    ;;
esac
AM_CONDITIONAL([SAVECONFIG_ENABLED], [test x$ntp_saveconfig_enabled = x1])
AC_MSG_RESULT([$ntp_ok])

###

AC_MSG_CHECKING([if we want the experimental leap smear code])
AC_ARG_ENABLE(
    [leap-smear],
    [AS_HELP_STRING(
	[--enable-leap-smear],
	[- experimental leap smear code]
    )],
    [ntp_ok=$enableval],
    [ntp_ok=no]
)
ntp_leap_smear_enabled=0
case "$ntp_ok" in
 yes)
    ntp_leap_smear_enabled=1
    AC_DEFINE([LEAP_SMEAR], [1], [leap smear mechanism])
    AC_SUBST([HAVE_LEAPSMEARINTERVAL])
    HAVE_LEAPSMEARINTERVAL="leapsmearinterval 0"
    ;;
esac
AC_MSG_RESULT([$ntp_ok])

###

AC_MSG_CHECKING([if we want dynamic interleave support])
AC_ARG_ENABLE(
    [dynamic-interleave],
    [AS_HELP_STRING(
	[--enable-dynamic-interleave],
	[- dynamic interleave support]
    )],
    [ntp_ok=$enableval],
    [ntp_ok=no]
)
ntp_dynamic_interleave=0
case "$ntp_ok" in
 yes)
    ntp_dynamic_interleave=1
    ;;
esac
AC_DEFINE_UNQUOTED([DYNAMIC_INTERLEAVE], [$ntp_dynamic_interleave],
    [support dynamic interleave?])
AC_MSG_RESULT([$ntp_ok])

NTP_UNITYBUILD

dnl  gtest is needed for our tests subdirs. It would be nice if we could
dnl  require a C++ compiler only if we will use gtest, but AC_PROG_CXX
dnl  can't be conditionalized.
NTP_GOOGLETEST

NTP_PROBLEM_TESTS

###

AC_DEFINE_DIR([NTP_KEYSDIR], [sysconfdir],
    [Default location of crypto key info])

AC_CONFIG_FILES([Makefile])
AC_CONFIG_FILES([adjtimed/Makefile])
AC_CONFIG_FILES([clockstuff/Makefile])
AC_CONFIG_FILES([include/Makefile])
AC_CONFIG_FILES([include/isc/Makefile])
AC_CONFIG_FILES([kernel/Makefile])
AC_CONFIG_FILES([kernel/sys/Makefile])
AC_CONFIG_FILES([libntp/Makefile])
AC_CONFIG_FILES([libparse/Makefile])
AC_CONFIG_FILES([ntpd/Makefile])
AC_CONFIG_FILES([ntpd/complete.conf],	[sed -e '/^rlimit$/d' -e '/^$/d' < ntpd/complete.conf > ntpd/complete.conf.new && mv ntpd/complete.conf.new ntpd/complete.conf])
AC_CONFIG_FILES([ntpdate/Makefile])
AC_CONFIG_FILES([ntpdc/Makefile])
AC_CONFIG_FILES([ntpdc/nl.pl],		[chmod +x ntpdc/nl.pl])
AC_CONFIG_FILES([ntpq/Makefile])
AC_CONFIG_FILES([ntpsnmpd/Makefile])
AC_CONFIG_FILES([parseutil/Makefile])
AC_CONFIG_FILES([scripts/Makefile])
AC_CONFIG_FILES([scripts/build/Makefile])
AC_CONFIG_FILES([scripts/build/genAuthors],	[chmod +x scripts/build/genAuthors])
AC_CONFIG_FILES([scripts/build/mkver],	[chmod +x scripts/build/mkver])
AC_CONFIG_FILES([scripts/calc_tickadj/Makefile])
AC_CONFIG_FILES([scripts/calc_tickadj/calc_tickadj], [chmod +x scripts/calc_tickadj/calc_tickadj])
AC_CONFIG_FILES([scripts/lib/Makefile])
AC_CONFIG_FILES([scripts/ntp-wait/Makefile])
AC_CONFIG_FILES([scripts/ntp-wait/ntp-wait],	[chmod +x scripts/ntp-wait/ntp-wait])
AC_CONFIG_FILES([scripts/ntpsweep/Makefile])
AC_CONFIG_FILES([scripts/ntpsweep/ntpsweep],	[chmod +x scripts/ntpsweep/ntpsweep])
AC_CONFIG_FILES([scripts/ntptrace/Makefile])
AC_CONFIG_FILES([scripts/ntptrace/ntptrace],	[chmod +x scripts/ntptrace/ntptrace])
AC_CONFIG_FILES([scripts/ntpver],	[chmod +x scripts/ntpver])
AC_CONFIG_FILES([scripts/plot_summary],	[chmod +x scripts/plot_summary])
AC_CONFIG_FILES([scripts/summary],	[chmod +x scripts/summary])
AC_CONFIG_FILES([scripts/update-leap/Makefile])
AC_CONFIG_FILES([scripts/update-leap/update-leap], [chmod +x scripts/update-leap/update-leap])
AC_CONFIG_FILES([tests/Makefile])
AC_CONFIG_FILES([tests/bug-2803/Makefile])
AC_CONFIG_FILES([tests/libntp/Makefile])
AC_CONFIG_FILES([tests/ntpd/Makefile])
AC_CONFIG_FILES([tests/ntpq/Makefile])
AC_CONFIG_FILES([tests/sandbox/Makefile])
AC_CONFIG_FILES([tests/sec-2853/Makefile])
AC_CONFIG_FILES([util/Makefile])

perllibdir="${datadir}/ntp/lib"
AC_DEFINE_DIR([PERLLIBDIR], [perllibdir], [data dir])

calc_tickadj_opts="$srcdir/scripts/calc_tickadj/calc_tickadj-opts"
AC_SUBST_FILE([calc_tickadj_opts])
ntp_wait_opts="$srcdir/scripts/ntp-wait/ntp-wait-opts"
AC_SUBST_FILE([ntp_wait_opts])
ntpsweep_opts="$srcdir/scripts/ntpsweep/ntpsweep-opts"
AC_SUBST_FILE([ntpsweep_opts])
ntptrace_opts="$srcdir/scripts/ntptrace/ntptrace-opts"
AC_SUBST_FILE([ntptrace_opts])
summary_opts="$srcdir/scripts/summary-opts"
AC_SUBST_FILE([summary_opts])
plot_summary_opts="$srcdir/scripts/plot_summary-opts"
AC_SUBST_FILE([plot_summary_opts])

AC_CONFIG_SUBDIRS([sntp])

AC_OUTPUT