configure.in

dnl Copyright 1998 The OpenLDAP Foundation.  All Rights Reserved.
dnl 
dnl Redistribution and use in source and binary forms are permitted only
dnl as authorized by the OpenLDAP Public License.  A copy of this
dnl license is available at http://www.OpenLDAP.org/license.html or
dnl in file LICENSE in the top-level directory of the distribution.
dnl ----

dnl Configure.in for OpenLDAP
AC_INIT(include/ldap.h)dnl
AC_CONFIG_AUX_DIR(build)dnl
AM_INIT_AUTOMAKE(OpenLDAP,[2.0-devel], [no ac_define])dnl

dnl Do not use AutoConf 2.12; it produces a configuration script
dnl that causes an "internal 2K buffer" error on HPUX when run
dnl with /bin/sh.  Autoconf 2.10 seems to be okay.
AC_PREREQ(2.10)dnl Required Autoconf version

AC_CONFIG_HEADER(include/portable.h include/ldap_features.h)dnl

dnl
dnl Start Args
AC_MSG_CHECKING(configure arguments)
AC_PREFIX_DEFAULT(/usr/local)

top_builddir=`pwd`
AC_SUBST(top_builddir)dnl

ldap_subdir="openldap"

AC_ARG_WITH(subdir, [  --with-subdir=DIR change default subdirectory used for installs], [
	if test "$withval" = "no"; then
		ldap_subdir=""
	elif test "$withval" != "yes"; then
		ldap_subdir="$withval"
	fi
])dnl

AC_SUBST(ldap_subdir)dnl

OL_ARG_ENABLE(debug,[  --enable-debug 	enable debugging], yes)dnl
ol_enable_syslog=no
dnl OL_ARG_ENABLE(syslog,[  --enable-syslog	enable syslog support], auto)dnl
OL_ARG_ENABLE(proctitle,[  --enable-proctitle	enable proctitle support], yes)dnl
OL_ARG_ENABLE(cache,[  --enable-cache	enable caching], yes)dnl
OL_ARG_ENABLE(dns,[  --enable-dns		enable V2 DNS  extension], no)dnl
OL_ARG_ENABLE(referrals,[  --enable-referrals	enable V2 Referrals extension], yes)dnl
OL_ARG_ENABLE(cldap,[  --enable-cldap	enable connectionless ldap], no)dnl
OL_ARG_ENABLE(x_compile,[  --enable-x-compile	enable cross compiling],
	no, [yes no])dnl


dnl General "with" options
OL_ARG_ENABLE(dmalloc,[  --enable-dmalloc	enable debug malloc support], no)dnl

OL_ARG_WITH(kerberos,[  --with-kerberos	use Kerberos],
	auto, [auto k5 k4 afs yes no])
OL_ARG_WITH(threads,[  --with-threads	use threads],
	auto, [auto posix mach lwp yes no manual] )
OL_ARG_WITH(yielding_select,[  --with-yielding-select	with implicitly yielding select],
	auto, [auto yes no manual] )

dnl Server options

dnl LDAPD OPTIONS
AC_ARG_WITH(xxldapdoptions,[LDAPD Options:])
OL_ARG_ENABLE(ldapd,[  --enable-ldapd	enable building ldapd], no)dnl

dnl SLAPD OPTIONS
AC_ARG_WITH(xxslapdoptions,[SLAPD Options:])
OL_ARG_ENABLE(slapd,[  --enable-slapd	enable building slapd], yes)dnl
OL_ARG_ENABLE(aclgroups,[    --enable-aclgroups	enable ACL group support], auto)dnl
OL_ARG_ENABLE(cleartext,[    --enable-cleartext	enable cleartext passwords], yes)dnl
OL_ARG_ENABLE(crypt,[    --enable-crypt	enable crypt(3) passwords], auto)dnl
OL_ARG_ENABLE(wrappers,[    --enable-wrappers	enable tcp wrapper support], no)dnl
OL_ARG_ENABLE(phonetic,[    --enable-phonetic	enable phonetic/soundex], no)dnl
OL_ARG_ENABLE(rlookups,[    --enable-rlookups	enable reverse lookups], auto)dnl

dnl SLAPD Backend options
OL_ARG_ENABLE(ldbm,[    --enable-ldbm	enable ldbm backend], yes)dnl
OL_ARG_WITH(ldbm_api,[      --with-ldbm-api	use LDBM API], auto,
	[auto db2 db gdbm ndbm manual])
OL_ARG_WITH(ldbm_type,[      --with-ldbm-type	use LDBM type], auto,
	[auto btree hash])

OL_ARG_ENABLE(passwd,[    --enable-passwd	enable passwd backend], no)dnl
OL_ARG_ENABLE(shell,[    --enable-shell	enable shell backend], no)dnl

dnl SLURPD OPTIONS
AC_ARG_WITH(xxslurpdoptions,[SLURPD Options:])
OL_ARG_ENABLE(slurpd,[  --enable-slurpd	enable building slurpd], auto)dnl

AC_ARG_WITH(xxliboptions,[Library Generation & Linking Options])
AM_ENABLE_STATIC
dnl AM_DISABLE_SHARED
AM_ENABLE_SHARED

dnl General "enable" options
# validate options
if test $ol_enable_referrals = no ; then
	if test $ol_enable_dns = yes ; then
		AC_MSG_WARN([dns disabled, ignoring --enable-dns argument])
	fi
	ol_enable_dns=no
fi

if test $ol_enable_slapd = no ; then
	dnl SLAPD was specificallly disabled
	if test $ol_enable_ldbm = yes ; then
		AC_MSG_WARN([slapd disabled, ignoring --enable_ldbm argument])
	fi
	if test $ol_enable_passwd = yes ; then
		AC_MSG_WARN([slapd disabled, ignoring --enable_passwd argument])
	fi
	if test $ol_enable_shell = yes ; then
		AC_MSG_WARN([slapd disabled, ignoring --enable_shell argument])
	fi
	if test $ol_enable_aclgroups = yes ; then
		AC_MSG_WARN([slapd disabled, ignoring --enable_aclgroups argument])
	fi
	if test $ol_enable_wrappers = yes ; then
		AC_MSG_WARN([slapd disabled, ignoring --enable_wrappers argument])
	fi
	if test $ol_enable_phonetic = yes ; then
		AC_MSG_WARN([slapd disabled, ignoring --enable_phonetic argument])
	fi
	if test $ol_enable_rlookups = yes ; then
		AC_MSG_WARN([slapd disabled, ignoring --enable_rlookups argument])
	fi
	if test $ol_with_ldbm_api != auto ; then
		AC_MSG_WARN([slapd disabled, ignoring --with_ldbm_api argument])
	fi
	if test $ol_with_ldbm_type != auto ; then
		AC_MSG_WARN([slapd disabled, ignoring --with_ldbm_type argument])
	fi
	if test $ol_enable_slurpd = yes ; then
		AC_MSG_ERROR([slurpd requires slapd])
	fi

	# force settings to no
	ol_enable_ldbm=no
	ol_enable_shell=no
	ol_enable_passwd=no
	ol_enable_aclgroups=no
	ol_enable_wrappers=no
	ol_enable_phonetic=no
	ol_enable_rlookups=no
	ol_with_ldbm_api=no
	ol_with_ldbm_type=no
	ol_enable_slurpd=no

elif test $ol_enable_ldbm = no ; then
	dnl SLAPD without LDBM

	if test $ol_with_ldbm_api != auto ; then
		AC_MSG_WARN([LDBM disabled, ignoring --with_ldbm_api argument])
	fi

	if test $ol_with_ldbm_type != auto ; then
		AC_MSG_WARN([LDBM disabled, ignoring --with_ldbm_type argument])
	fi

	if test $ol_enable_passwd = no -a $ol_enable_shell = no ; then
		AC_MSG_ERROR([slapd requires a backend])
	fi

	ol_with_ldbm_api=no
	ol_with_ldbm_type=no

else
	dnl SLAPD with LDBM

	if test $ol_with_ldbm_api = gdbm -a \
		$ol_with_ldbm_type = btree ; then
		AC_MSG_ERROR([GDBM only supports LDBM type hash])
	fi
	if test $ol_with_ldbm_api = ndbm -a \
		$ol_with_ldbm_type = btree ; then
		AC_MSG_ERROR([NDBM only supports LDBM type hash])
	fi
fi

if test $ol_enable_slurpd = yes ; then
	dnl SLURPD was specifically enabled
	if test $ol_with_threads = no ; then
		AC_MSG_ERROR([slurpd requires threads])
	fi
fi

AC_MSG_RESULT(done)

AC_CANONICAL_HOST

## Initialize vars
LDAP_LIBS=
LDBM_LIBS=
LTHREAD_LIBS=
LUTIL_LIBS=

LDAPD_LIBS=
SLAPD_LIBS=
SLURPD_LIBS=

BUILD_LDAPD=no
BUILD_SLAPD=no
BUILD_SLURPD=no

BUILD_LDBM=no
BUILD_PASSWD=no
BUILD_SHELL=no
BUILD_THREAD=no

KRB_LIBS=
TERMCAP_LIBS=

dnl ----------------------------------------------------------------
dnl Checks for programs

AC_PROG_INSTALL
AM_PROG_LIBTOOL
dnl AC_PROG_MAKE_SET

AC_PATH_PROG(SENDMAIL, sendmail, /usr/lib/sendmail,
	$PATH:/usr/libexec:/usr/lib:/usr/sbin:/usr/etc:/etc)
AC_PATH_PROG(EDITOR, vi, /usr/ucb/vi, $PATH:/usr/ucb)
AC_PATH_PROG(FINGER, finger, /usr/ucb/finger, $PATH:/usr/ucb)

dnl Checks the compiler and UNIX Variants

if test $cross_compiling = yes -a $ol_enable_x_compile = yes; then
	AC_MSG_WARN([cross compiling....  some functionality will be removed.])

elif test $cross_compiling = no -a $ol_enable_x_compile = yes; then
	AC_MSG_WARN([programs compiled here do run here...])
	AC_MSG_ERROR([  if not cross compiling, use --disable-x-compile.])

elif test $cross_compiling = yes -a $ol_enable_x_compile = no; then
	AC_MSG_WARN([programs compiled here do not run here...])
	AC_MSG_ERROR([  if cross compiling,  add --enable-x-compile.])
fi

AC_PROG_CPP

AC_AIX
AC_ISC_POSIX
AC_MINIX

dnl OpenLDAP requires STDC features
AM_PROG_CC_STDC
if test "X${am_cv_prog_cc_stdc}" = "Xno" ; then
	AC_MSG_ERROR([OpenLDAP requires compiler to support STDC prototypes.])
fi

dnl AM_C_PROTOTYPES

dnl Checks for libraries

dnl Find socket()
dnl Likely combinations:
dnl		-lsocket [ -lnsl_s | -lnsl ]
dnl		-linet

AC_CHECK_FUNC(socket, [have_socket=yes], [	
dnl
dnl hopefully we won't include too many libraries
dnl
	AC_CHECK_LIB(socket, main)
	AC_CHECK_LIB(net, main)
	AC_CHECK_LIB(nsl_s, main)
	AC_CHECK_LIB(nsl, main)
	AC_CHECK_LIB(inet, socket)
	AC_CHECK_LIB(gen, main)
])

dnl Check for resolv
AC_CHECK_LIB(resolv, res_search)

dnl HP-UX requires -lV3
AC_CHECK_LIB(V3, sigset)

# ISODE tests
ol_link_isode=no
if test $ol_enable_ldapd != no ; then
	dnl look for ISODE libraries
	AC_CHECK_LIB(xtpp, main, [
		ol_link_isode=yes
		AC_DEFINE(HAVE_XTPP,1)
		LDAPD_LIBS="$LDAPD_LIBS -lxtpp -lxtdsap -lxtisode -losi"
		],:,[-lxtdsap -lxtisode -losi])
	AC_CHECK_LIB(dsap, main, [
		ol_link_isode=yes
		AC_DEFINE(HAVE_DSAP,1)
		LDAPD_LIBS="$LDAPD_LIBS -ldsap"
		],:,[-lisode])
	AC_CHECK_LIB(isode, main, [
		ol_link_isode=yes
		AC_DEFINE(HAVE_ISODE,1)
		LDAPD_LIBS="$LDAPD_LIBS -lisode"
		],:)
fi

if test $ol_link_isode != no; then
	AC_CHECK_LIB(pp, main, [
		AC_DEFINE(HAVE_PP,1)
		LDAPD_LIBS="-lpp $LDAPD_LIBS"
		],:)

	AC_PATH_PROG(PEPSY, pepsy)
fi

dnl
dnl check for kerberos
dnl
ol_link_kerberos=no

if test $ol_with_kerberos = auto -o $ol_with_kerberos = k5 ; then
	AC_CHECK_HEADERS(kerberosIV/krb.h kerberosIV/des.h)

	if test $ac_cv_header_kerberosIV_krb_h = yes ; then
		AC_CHECK_LIB(krb4, main, [have_k5=yes], [have_k5=no],
			[-lkrb5 -ldes425])

		if test $have_k5 = yes ; then
			ol_with_kerberos=found
			ol_link_kerberos=yes

			AC_DEFINE(HAVE_KERBEROS)
			KRB_LIBS="-lkrb4 -lkrb5 -ldes425"
		fi
	fi
fi

if test $ol_with_kerberos = auto -o $ol_with_kerberos = k4 ; then
	AC_CHECK_HEADERS(krb.h des.h)

	if test $ac_cv_header_krb_h = yes ; then
		AC_CHECK_LIB(krb, main, [have_k4=yes], [have_k4=no], [-ldes])

		if test $have_k4 = yes ; then
			ol_with_kerberos=found
			ol_link_kerberos=yes

			AC_DEFINE(HAVE_KERBEROS)
			KRB_LIBS="-lkrb -ldes"
		fi
	fi
fi

dnl	if test $ol_link_kerberos = yes ; then
dnl		save_LIBS=$LIBS
dnl		LIBS="$KRB_LIBS $LIBS"
dnl		AC_CHECK_FUNCS(des_string_to_key)
dnl		LIBS=$save_LIBS
dnl fi

ol_link_threads=no
if test $ol_with_threads = auto -o $ol_with_threads = yes \
	-o $ol_with_threads = posix ; then

	AC_CHECK_HEADERS(pthread.h sched.h)

	if test $ac_cv_header_pthread_h = yes ; then
		OL_POSIX_THREAD_VERSION

		if test $ol_cv_pthread_version = final ; then
			AC_DEFINE(HAVE_PTHREADS_FINAL)
		elif test $ol_cv_pthread_version = draft4 ; then
			AC_DEFINE(HAVE_PTHREADS_D4)
		else
			AC_MSG_ERROR([unknown pthread version])
		fi

		# consider threads found
		ol_with_threads=found

		OL_LINUX_THREADS

		if test $ol_cv_linux_threads = yes ; then
			AC_DEFINE(HAVE_LINUX_THREADS,1)
		fi

		dnl Now the hard part, how to link

		dnl Check for pthread support in current $LIBS
		AC_CHECK_FUNC(pthread_create,[ol_link_threads=yes])

		if test $ol_link_threads = no ; then
			dnl try -pthread
			AC_CACHE_CHECK([for pthread_create with -pthread],
				[ol_cv_pthread_flag], [
				dnl save the flags
				save_LIBS="$LIBS"
				LIBS="-pthread $LIBS"
				AC_TRY_LINK([char pthread();],[
					pthread_create();
					], ol_cv_pthread_flag=yes, ol_cv_pthread_flag=no)
				dnl restore the LIBS
				LIBS="$save_LIBS"
			])

			if test $ol_cv_pthread_flag = yes ; then
				LTHREAD_LIBS="$LTHREAD_LIBS -pthread"
				ol_link_threads=posix
			fi
		fi

		if test $ol_link_threads = no ; then
			dnl try -pthreads
			AC_CACHE_CHECK([for pthread_create with -pthreads],
				[ol_cv_pthreads_flag], [
				dnl save the flags
				save_LIBS="$LIBS"
				LIBS="-pthreads $LIBS"
				AC_TRY_LINK([char pthread();],[
					pthread_create();
					], ol_cv_pthreads_flag=yes, ol_cv_pthreads_flag=no)
				dnl restore the LIBS
				LIBS="$save_LIBS"
			])

			if test $ol_cv_pthreads_flag = yes ; then
				LTHREAD_LIBS="$LTHREAD_LIBS -pthreads"
				ol_link_threads=posix
			fi
		fi

		if test $ol_link_threads = no ; then
			dnl try -thread
			AC_CACHE_CHECK([for pthread_create with -thread],
				[ol_cv_thread_flag], [
				dnl save the flags
				save_LIBS="$LIBS"
				LIBS="-thread $LIBS"
				AC_TRY_LINK([char pthread();],[
					pthread_create();
					], ol_cv_thread_flag=yes, ol_cv_thread_flag=no)
				dnl restore the LIBS
				LIBS="$save_LIBS"
			])

			if test $ol_cv_thread_flag = yes ; then
				LTHREAD_LIBS="$LTHREAD_LIBS -thread"
				ol_link_threads=posix
			fi
		fi

		if test $ol_link_threads = no ; then
			dnl try DEC Threads -lpthread -lexc
			save_LIBS="$LIBS"
			AC_CHECK_LIB(pthread, pthread_join, [
				ol_link_threads=posix
				LTHREAD_LIBS="$LTHREAD_LIBS -lpthread -lexc"
				if test $ol_with_yielding_select = auto ; then
					ol_with_yielding_select=yes
				fi
				],,[-lexc])
			LIBS="$save_LIBS"
		fi

		if test $ol_link_threads = no ; then
			dnl try DEC Threads -lpthreads -lmach -lexc -lc_r
			save_LIBS="$LIBS"
			AC_CHECK_LIB(pthreads, pthread_join, [
				ol_link_threads=posix
				LTHREAD_LIBS="$LTHREAD_LIBS -lpthreads -lmach -lexc -lc_r"
				if test $ol_with_yielding_select = auto ; then
					ol_with_yielding_select=yes
				fi
				],,[-lmach -lexc -lc_r])
			LIBS="$save_LIBS"
		fi

		if test $ol_link_threads = no ; then
			dnl try -lpthread
			save_LIBS="$LIBS"
			AC_CHECK_LIB(pthread, pthread_create, [
				ol_link_threads=posix
				LTHREAD_LIBS="$LTHREAD_LIBS -lpthread"])
			LIBS="$save_LIBS"
		fi

		if test $ol_link_threads = no ; then
			dnl try -lc_r
			save_LIBS="$LIBS"
			AC_CHECK_LIB(c_r, pthread_create, [
				ol_link_threads=posix
				LTHREAD_LIBS="$LTHREAD_LIBS -lc_r"])
			LIBS="$save_LIBS"
		fi

		if test $ol_link_threads = no ; then
			dnl try -lpthreads
			save_LIBS="$LIBS"
			AC_CHECK_LIB(pthreads, pthread_create, [
				ol_link_threads=posix
				LTHREAD_LIBS="$LTHREAD_LIBS -lpthreads"])
			LIBS="$save_LIBS"
		fi

		if test $ol_link_threads != no ; then
			AC_DEFINE(HAVE_PTHREADS)

			dnl save flags
			save_CPPFLAGS="$CPPFLAGS"
			save_LIBS="$LIBS"
			LIBS="$LTHREAD_LIBS $LIBS"

			dnl All POSIX Thread (final) implementations should have
			dnl sched_yield instead of pthread yield.
			dnl check for both
			AC_CHECK_FUNCS(sched_yield pthread_yield)

			if test $ac_cv_func_sched_yield = no -a \
				$ac_cv_func_pthread_yield = no ; then
				dnl Digital UNIX has sched_yield() in -lrt
				AC_CHECK_LIB(rt, sched_yield,
					[LTHREAD_LIBS="$LTHREAD_LIBS -lrt"
					AC_DEFINE(HAVE_SCHED_YIELD,1)
					ac_cv_func_sched_yield=yes],
					[ac_cv_func_sched_yield=no])
			fi
			if test $ac_cv_func_sched_yield = no -a \
				$ac_cv_func_pthread_yield = no ; then
				dnl Solaris has sched_yield() in -lposix4
				AC_CHECK_LIB(posix4, sched_yield,
					[LTHREAD_LIBS="$LTHREAD_LIBS -lposix4"
					AC_DEFINE(HAVE_SCHED_YIELD,1)
					ac_cv_func_sched_yield=yes],
					[ac_cv_func_sched_yield=no])
			fi
			if test $ac_cv_func_sched_yield = no -a \
				$ac_cv_func_pthread_yield = no ; then
				AC_MSG_WARN([could not locate sched_yield() or pthread_yield()])
				AC_MSG_ERROR([POSIX Threads are not usable])
			fi

			dnl Check functions for compatibility
			AC_CHECK_FUNCS(pthread_kill)
			AC_CHECK_FUNCS( \
				pthread_attr_create pthread_attr_init \
				pthread_attr_destroy pthread_attr_delete \
				pthread_attr_setdetachstate pthread_attr_setdetach_np \
			)

			dnl Check for setconcurreny functions
			AC_CHECK_FUNCS(	\
				pthread_setconcurrency \
				thr_setconcurrency \
			)

			AC_MSG_CHECKING([if pthread_create() works])
			AC_CACHE_VAL(ol_cv_pthread_create_works,[
			AC_TRY_RUN([
#include <pthread.h>
#ifndef NULL
#define NULL (void*)0
#endif

static void *task(p)
	void *p;
{
	return (void *) (p == NULL);
}

int main(argc, argv)
	int argc;
	char **argv;
{
	pthread_t t;
	exit(pthread_create(&t, NULL, task, NULL));
}
],
				[ol_cv_pthread_create_works=yes],
				[ol_cv_pthread_create_works=no],
				[dnl assume yes
				ol_cv_pthread_create_works=yes])])
			AC_MSG_RESULT($ol_cv_pthread_create_works)

			if test $ol_cv_pthread_create_works = no ; then
				AC_MSG_ERROR([pthread.h and pthread_create are not compatible])
			fi

			dnl Check if select causes an yield
			if test $ol_with_yielding_select = auto ; then
				AC_MSG_CHECKING([if select yields when using pthreads])
				AC_CACHE_VAL(ol_cv_pthread_select_yields,[
				AC_TRY_RUN([
#include <sys/types.h>
#include <sys/time.h>
#include <unistd.h>
#include <pthread.h>
#ifndef NULL
#define NULL (void*) 0
#endif

static int fildes[2];

static void *task(p)
	void *p;
{
	int i;
	struct timeval tv;

	fd_set rfds;

	tv.tv_sec=10;
	tv.tv_usec=0;

	FD_ZERO(&rfds);
	FD_SET(fildes[0], &rfds);

	/* we're not interested in any fds */
	i = select(FD_SETSIZE, &rfds, NULL, NULL, &tv);

	if(i < 0) {
		perror("select");
		exit(10);
	}

	exit(0); /* if we exit here, the select blocked the whole process */
}

int main(argc, argv)
	int argc;
	char **argv;
{
	pthread_t t;

	/* create a pipe to select */
	if(pipe(&fildes[0])) {
		perror("select");
		exit(1);
	}

#ifdef HAVE_PTHREAD_SETCONCURRENCY
	(void) pthread_setconcurrency(2);
#else
#ifdef HAVE_THR_SETCONCURRENCY
	/* Set Solaris LWP concurrency to 2 */
	thr_setconcurrency(2);
#endif
#endif

	pthread_create(&t, NULL, task, NULL);

#if HAVE_SCHED_YIELD
	sched_yield();	/* make sure task runs first */
#else
#ifdef HAVE_PTHREAD_YIELD
	pthread_yield();	/* make sure task runs first */
#endif
#endif

	exit(2);
}],
				[ol_cv_pthread_select_yields=no],
				[ol_cv_pthread_select_yields=yes], [
				AC_MSG_ERROR([crossing compiling: use --with-yielding_select=yes|no|manual])])])
				AC_MSG_RESULT($ol_cv_pthread_select_yields)

				if test $ol_cv_pthread_select_yields = yes ; then
					ol_with_yielding_select=yes
				fi
			fi

			dnl restore flags
			CPPFLAGS="$save_CPPFLAGS"
			LIBS="$save_LIBS"
		else
			AC_MSG_ERROR([could not link with POSIX Threads])
		fi
	fi

	if test $ol_with_threads = posix ; then
		AC_MSG_ERROR([could not locate POSIX Threads])
	fi
fi

if test $ol_with_threads = auto -o $ol_with_threads = yes \
	-o $ol_with_threads = mach ; then

	dnl check for Mach CThreads
	AC_CHECK_HEADERS(mach/cthreads.h)
	if test $ac_cv_header_mach_cthreads_h = yes ; then
		ol_with_threads=found

		dnl check for cthread support in current $LIBS
		AC_CHECK_FUNC(cthread_fork,[ol_link_threads=yes])

		if test $ol_link_threads = no ; then
			dnl try -all_load
			dnl this test needs work
			AC_CACHE_CHECK([for cthread_fork with -all_load],
				[ol_cv_cthread_all_load], [
				dnl save the flags
				save_LIBS="$LIBS"
				LIBS="-all_load $LIBS"
				AC_TRY_LINK([#include <mach/cthreads.h>],[
					cthread_fork((void *)0, (void *)0);
					], ol_cv_cthread_all_load=yes, ol_cv_cthread_all_load=no)
				dnl restore the LIBS
				LIBS="$save_LIBS"
			])

			if test $ol_cv_cthread_all_load = yes ; then
				LTHREAD_LIBS="$LTHREAD_LIBS -all_load"
				ol_link_threads=mach
			fi
		fi

		if test $ol_link_threads != no ; then
			: check for cthread specific functionality here
			AC_DEFINE(HAVE_MACH_CTHREADS,1)
		else
			AC_MSG_ERROR([could not link with Mach CThreads])
		fi
	fi

	if test $ol_with_threads = mach ; then
		AC_MSG_ERROR([could not locate Mach CThreads])
	fi
fi

if test $ol_with_threads = auto -o $ol_with_threads = yes \
	-o $ol_with_threads = lwp ; then

	dnl check for SunOS5 LWP
	AC_CHECK_HEADERS(thread.h synch.h)
	if test $ac_cv_header_thread_h = yes -a $ac_cv_header_synch_h = yes ; then
		AC_CHECK_LIB(thread, thr_create, [have_thr=yes], [have_thr=no])

		if test $have_thr = yes ; then
			AC_DEFINE(HAVE_THR)
			LTHREAD_LIBS="$LTHREAD_LIBS -lthread"
			ol_link_threads=thr

			if test $ol_with_yielding_select = auto ; then
				ol_with_yielding_select=yes
			fi
		fi
	fi

	dnl check for SunOS4 LWP
	AC_CHECK_HEADERS(lwp/lwp.h)
	if test $ac_cv_header_lwp_lwp_h = yes ; then
		AC_CHECK_LIB(lwp, lwp_create, [have_lwp=yes], [have_lwp=no])

		if test $have_lwp = yes ; then
			AC_DEFINE(HAVE_LWP)
			LTHREAD_LIBS="$LTHREAD_LIBS -llwp"
			ol_link_threads=lwp

			if test $ol_with_yielding_select = auto ; then
				ol_with_yielding_select=no
			fi
		fi
	fi
fi

if test $ol_with_yielding_select = yes ; then
	AC_DEFINE(HAVE_YIELDING_SELECT,1)
fi

if test $ol_with_threads = manual ; then
	dnl User thinks he can manually configure threads.
	ol_link_threads=yes

	AC_MSG_WARN([thread defines and link options must be set manually])

	AC_CHECK_HEADERS(pthread.h sched.h)
	AC_CHECK_FUNCS(sched_yield pthread_yield)
	OL_LINUX_THREADS

	AC_CHECK_HEADERS(mach/cthreads.h)
	AC_CHECK_HEADERS(lwp/lwp.h)
	AC_CHECK_HEADERS(thread.h synch.h)
fi

if test $ol_link_threads != no ; then  
	dnl needed to get reentrant/threadsafe versions
	dnl
	AC_DEFINE(REENTRANT,1)
	AC_DEFINE(_REENTRANT,1)
	AC_DEFINE(THREAD_SAFE,1)
	AC_DEFINE(_THREAD_SAFE,1)
	AC_DEFINE(THREADSAFE,1)
	AC_DEFINE(_THREADSAFE,1)

	dnl this might cause the errno symbol to be
	dnl replaced with a function to get a thread specific errno.
	dnl check to see if everything needs to be compiled
	dnl with the thread libraries
	AC_CACHE_CHECK([for thread specific errno],
		[ol_cv_errno_thread_specific], [
		AC_TRY_LINK([
#include <errno.h>
			], [
int x = errno;
			],
			[ol_cv_errno_thread_specific=yes],
			[ol_cv_errno_thread_specific=no])
	])

	if test $ol_cv_errno_thread_specific != yes ; then
		LIBS="$LTHREAD_LIBS $LIBS"
		LTHREAD_LIBS=""
	fi

dnl When in thread environment, use 
dnl		#if defined( HAVE_REENTRANT_FUNCTIONS ) \ 
dnl			|| defined( HAVE_FUNC_R )
dnl			func_r(...);
dnl		#else
dnl		#	if defined( HAVE_THREADS ) 
dnl				/* lock */
dnl		#	endif
dnl				func(...);
dnl		#	if defined( HAVE_THREADS ) 
dnl				/* unlock */
dnl		#	endif
dnl		#endif
dnl
dnl HAVE_REENTRANT_FUNCTIONS is derived from:
dnl		_POSIX_REENTRANT_FUNCTIONS
dnl		_POSIX_THREAD_SAFE_FUNCTIONS
dnl		_POSIX_THREADSAFE_FUNCTIONS
dnl
dnl		and is currently defined in lthread.h
dnl
dnl HAVE_THREADS is defined by lthread.h iff -UNO_THREADS
dnl 
dnl libldap/*.c should only include <lthread.h> iff
dnl LDAP_R_COMPILE is defined.  ie:
dnl		#ifdef LDAP_R_COMPILE
dnl		#	include LDAP_R_COMPILE
dnl		#endif
dnl
dnl LDAP_R_COMIPLE is defined by libldap_r/Makefile.in
dnl specifically for compiling the threadsafe version of
dnl	the ldap library (-lldap_r).
dnl		
dnl	dnl check for reentrant/threadsafe functions
dnl	dnl
dnl	dnl note: these should only be used when linking
dnl	dnl       with $LTHREAD_LIBS
dnl	dnl
dnl	save_CPPFLAGS="$CPPFLAGS"
dnl	save_LIBS="$LIBS"
dnl	LIBS="$LTHREAD_LIBS $LIBS"
dnl	AC_CHECK_FUNCS(	\
dnl		strtok_r \
dnl		gmtime_r \
dnl		gethostbyaddr_r gethostbyname_r \
dnl		feof_unlocked unlocked_feof \
dnl		putc_unlocked unlocked_putc \
dnl		flockfile ftrylockfile \
dnl	)
dnl	CPPFLAGS="$save_CPPFLAGS"
dnl	LIBS="$save_LIBS"
fi  

dnl ----------------------------------------------------------------

if test $ol_link_threads = no ; then
	if test $ol_with_threads = yes ; then
		AC_MSG_ERROR([no suitable thread support])
	fi

	if test $ol_with_threads = auto ; then
		AC_MSG_WARN([no suitable thread support, disabling threads])
		ol_with_threads=no
	fi

	AC_DEFINE(NO_THREADS,1)
	LTHREAD_LIBS=""
fi

ol_link_ldbm=no 
if test $ol_with_ldbm_api = auto -o $ol_with_ldbm_api = db2 ; then
	OL_BERKELEY_DB2

	if test $ol_cv_berkeley_db2 = yes ; then
		ol_link_ldbm=db2
		ol_with_ldbm_api=db2

		if test $ol_with_ldbm_type = hash ; then
			AC_DEFINE(LDBM_USE_DBHASH,1)
		else
			AC_DEFINE(LDBM_USE_DBBTREE,1)
		fi

		dnl $ol_cv_lib_db2 should be yes or -ldb
		dnl (it could be no, but that would be an error
		if test $ol_cv_lib_db2 != yes ; then
			LDBM_LIBS="$LDBM_LIBS $ol_cv_lib_db2"
		fi
	fi
fi

if test $ol_with_ldbm_api = auto -o $ol_with_ldbm_api = db ; then
	OL_BERKELEY_DB

	if test $ol_cv_berkeley_db = yes ; then
		ol_link_ldbm=db
		ol_with_ldbm_api=db

		if test $ol_with_ldbm_type = hash ; then
			AC_DEFINE(LDBM_USE_DBHASH,1)
		else
			AC_DEFINE(LDBM_USE_DBBTREE,1)
		fi

		dnl $ol_cv_lib_db should be yes or -ldb
		dnl (it could be no, but that would be an error
		if test $ol_cv_lib_db != yes ; then
			LDBM_LIBS="$LDBM_LIBS $ol_cv_lib_db"
		fi
	fi
fi

if test $ol_with_ldbm_api = manual ; then
	dnl User thinks he can manually configure LDBM api.
	ol_link_ldbm=yes

	AC_MSG_WARN([LDBM defines and link options must be set manually])

	AC_CHECK_HEADERS(db.h db_185.h gdbm.h ndbm.h)
fi

if test $ol_link_ldbm = no -a $ol_with_ldbm_type = btree ; then
	AC_MSG_WARN(Could not find LDBM with BTREE support)
	ol_with_ldbm_api=none
fi

if test $ol_with_ldbm_api = auto -o $ol_with_ldbm_api = gdbm ; then
	OL_GDBM

	if test $ol_cv_gdbm = yes ; then
		ol_link_ldbm=gdbm
		ol_with_ldbm_api=gdbm

		if test $ol_cv_lib_gdbm != yes ; then
			LDBM_LIBS="$LDBM_LIBS $ol_cv_lib_gdbm"
		fi
	fi
fi

if test $ol_with_ldbm_api = auto ; then
	AC_MSG_WARN([skipping automatic checking for NDBM, must be manually enabled.])
elif test $ol_with_ldbm_api = ndbm ; then
	OL_NDBM

	if test $ol_cv_ndbm = yes ; then
		ol_link_ldbm=ndbm
		ol_with_ldbm_api=ndbm

		if test $ol_cv_lib_ndbm != yes ; then
			LDBM_LIBS="$LDBM_LIBS $ol_cv_lib_ndbm"
		fi
	fi
fi

if test $ol_link_ldbm = no -a $ol_enable_ldbm != no ; then
	AC_MSG_WARN(could not find suitable LDBM backend)
	if test $ol_enable_ldbm = yes ; then
		AC_MSG_ERROR(select appropriate LDBM options or disable)
	fi

	AC_MSG_WARN(disabling LDBM)
	ol_enable_ldbm=no
fi

if test $ol_enable_wrappers != no ; then
	AC_CHECK_LIB(wrap, main,
		[have_wrappers=yes], [have_wrappers=no])

	if test $have_wrappers = yes ; then
		AC_DEFINE(HAVE_TCPD)
		SLAPD_LIBS="$SLAPD_LIBS -lwrap"
	else
		AC_MSG_WARN(could not find -lwrap)
		if test $ol_enable_wrappers = yes ; then
			AC_MSG_ERROR(could not find wrappers, select appropriate options or disable)
		fi

		AC_MSG_WARN(disabling wrappers support)
		ol_enable_wrappers=no
	fi

fi

if test $ol_enable_syslog != no ; then
	AC_CHECK_FUNC(openlog)
	if test $ac_cv_func_openlog = no -a $ol_enable_syslog = yes; then
		AC_MSG_ERROR(could not find syslog, select appropriate options or disable)
	fi
	ol_enable_syslog=$ac_cv_func_openlog
fi

if test $ol_enable_dmalloc != no ; then