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dnl OpenLDAP Autoconf Macros
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dnl $OpenLDAP$
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dnl This work is part of OpenLDAP Software <http://www.openldap.org/>.
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dnl
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dnl Copyright 1998-2003 The OpenLDAP Foundation.
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dnl All rights reserved.
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dnl
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dnl Redistribution and use in source and binary forms, with or without
dnl modification, are permitted only as authorized by the OpenLDAP
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dnl Public License.
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dnl
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dnl A copy of this license is available in the file LICENSE in the
dnl top-level directory of the distribution or, alternatively, at
dnl <http://www.OpenLDAP.org/license.html>.
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dnl
dnl --------------------------------------------------------------------
dnl Restricted form of AC_ARG_ENABLE that limits user options
dnl
dnl $1 = option name
dnl $2 = help-string
dnl $3 = default value	(auto)
dnl $4 = allowed values (auto yes no)
AC_DEFUN([OL_ARG_ENABLE], [# OpenLDAP --enable-$1
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	AC_ARG_ENABLE($1,changequote(<,>)<$2 [>ifelse($3,,auto,$3)<]>changequote([,]),[
	ol_arg=invalid
	for ol_val in ifelse($4,,[auto yes no],[$4]) ; do
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		if test "$enableval" = "$ol_val" ; then
			ol_arg="$ol_val"
		fi
	done
	if test "$ol_arg" = "invalid" ; then
		AC_MSG_ERROR(bad value $enableval for --enable-$1)
	fi
	ol_enable_$1="$ol_arg"
],
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[	ol_enable_$1=ifelse($3,,"auto","$3")])dnl
dnl AC_VERBOSE(OpenLDAP -enable-$1 $ol_enable_$1)
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# end --enable-$1
])dnl
dnl
dnl --------------------------------------------------------------------
dnl Restricted form of AC_ARG_WITH that limits user options
dnl
dnl $1 = option name
dnl $2 = help-string
dnl $3 = default value (no)
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dnl $4 = allowed values (yes or no)
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AC_DEFUN([OL_ARG_WITH], [# OpenLDAP --with-$1
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	AC_ARG_WITH($1,changequote(<,>)<$2 [>ifelse($3,,yes,$3)<]>changequote([,]),[
	ol_arg=invalid
	for ol_val in ifelse($4,,[yes no],[$4]) ; do
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		if test "$withval" = "$ol_val" ; then
			ol_arg="$ol_val"
		fi
	done
	if test "$ol_arg" = "invalid" ; then
		AC_MSG_ERROR(bad value $withval for --with-$1)
	fi
	ol_with_$1="$ol_arg"
],
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[	ol_with_$1=ifelse($3,,"no","$3")])dnl
dnl AC_VERBOSE(OpenLDAP --with-$1 $ol_with_$1)
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# end --with-$1
])dnl
dnl
dnl ====================================================================
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dnl
AC_DEFUN(AC_COMPILE_CHECK_SIZEOF,
[changequote(<<, >>)dnl 
dnl The name to #define. 
define(<<AC_TYPE_NAME>>, translit(sizeof_$1, [a-z *], [A-Z_P]))dnl 
dnl The cache variable name. 
define(<<AC_CV_NAME>>, translit(ac_cv_sizeof_$1, [ *], [_p]))dnl 
changequote([, ])dnl 
AC_MSG_CHECKING(size of $1) 
AC_CACHE_VAL(AC_CV_NAME, 
[for ac_size in 4 8 1 2 16 $2 ; do # List sizes in rough order of prevalence. 
  AC_TRY_COMPILE([#include "confdefs.h" 
#include <sys/types.h> 
$2 
], [switch (0) case 0: case (sizeof ($1) == $ac_size):;], AC_CV_NAME=$ac_size) 
  if test x$AC_CV_NAME != x ; then break; fi 
done 
]) 
if test x$AC_CV_NAME = x ; then 
  AC_MSG_ERROR([cannot determine a size for $1]) 
fi 
AC_MSG_RESULT($AC_CV_NAME) 
AC_DEFINE_UNQUOTED(AC_TYPE_NAME, $AC_CV_NAME, [The number of bytes in type $1]) 
undefine([AC_TYPE_NAME])dnl 
undefine([AC_CV_NAME])dnl 
])
dnl ====================================================================
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dnl check if hard links are supported.
dnl
AC_DEFUN([OL_PROG_LN_H], [# test for ln hardlink support
AC_MSG_CHECKING(whether ln works)
AC_CACHE_VAL(ol_cv_prog_LN_H,
[rm -f conftest.src conftest.dst
echo "conftest" > conftest.src
if ln conftest.src conftest.dst 2>/dev/null
then
  ol_cv_prog_LN_H="ln"
else
  ol_cv_prog_LN_H="cp"
fi
rm -f conftest.src conftest.dst
])dnl
LN_H="$ol_cv_prog_LN_H"
if test "$ol_cv_prog_LN_H" = "ln"; then
	AC_MSG_RESULT(yes)
else
	AC_MSG_RESULT(no)
fi
AC_SUBST(LN_H)dnl
])dnl
dnl
dnl ====================================================================
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dnl Check for dependency generation flag
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AC_DEFUN([OL_MKDEPEND], [# test for make depend flag
OL_MKDEP=
OL_MKDEP_FLAGS=
if test -z "${MKDEP}"; then
	OL_MKDEP="${CC-cc}"
	if test -z "${MKDEP_FLAGS}"; then
		AC_CACHE_CHECK([for ${OL_MKDEP} depend flag], ol_cv_mkdep, [
			ol_cv_mkdep=no
			for flag in "-M" "-xM"; do
				cat > conftest.c <<EOF
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 noCode;
EOF
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				if AC_TRY_COMMAND($OL_MKDEP $flag conftest.c) \
					| egrep '^conftest\.'"${ac_objext}" >/dev/null 2>&1
				then
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					if test ! -f conftest."${ac_object}" ; then
						ol_cv_mkdep=$flag
						OL_MKDEP_FLAGS="$flag"
						break
					fi
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				fi
			done
			rm -f conftest*
		])
	else
		cc_cv_mkdep=yes
		OL_MKDEP_FLAGS="${MKDEP_FLAGS}"
	fi
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else
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	cc_cv_mkdep=yes
	OL_MKDEP="${MKDEP}"
	OL_MKDEP_FLAGS="${MKDEP_FLAGS}"
fi
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AC_SUBST(OL_MKDEP)
AC_SUBST(OL_MKDEP_FLAGS)
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])
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dnl
dnl ====================================================================
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dnl Check if system uses EBCDIC instead of ASCII
AC_DEFUN([OL_CPP_EBCDIC], [# test for EBCDIC
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AC_CACHE_CHECK([for EBCDIC],ol_cv_cpp_ebcdic,[
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	AC_TRY_CPP([
#if !('M' == 0xd4)
#include <__ASCII__/generate_error.h>
#endif
],
	[ol_cv_cpp_ebcdic=yes],
	[ol_cv_cpp_ebcdic=no])])
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if test $ol_cv_cpp_ebcdic = yes ; then
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	AC_DEFINE(HAVE_EBCDIC,1, [define if system uses EBCDIC instead of ASCII])
fi
])
dnl
dnl --------------------------------------------------------------------
dnl OpenLDAP version of STDC header check w/ EBCDIC support
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AC_DEFUN(OL_HEADER_STDC,
[AC_REQUIRE_CPP()dnl
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AC_REQUIRE([OL_CPP_EBCDIC])dnl
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AC_CACHE_CHECK([for ANSI C header files], ol_cv_header_stdc,
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[AC_TRY_CPP([#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <float.h>], ol_cv_header_stdc=yes, ol_cv_header_stdc=no)

if test $ol_cv_header_stdc = yes; then
  # SunOS 4.x string.h does not declare mem*, contrary to ANSI.
AC_EGREP_HEADER(memchr, string.h, , ol_cv_header_stdc=no)
fi

if test $ol_cv_header_stdc = yes; then
  # ISC 2.0.2 stdlib.h does not declare free, contrary to ANSI.
AC_EGREP_HEADER(free, stdlib.h, , ol_cv_header_stdc=no)
fi

if test $ol_cv_header_stdc = yes; then
  # /bin/cc in Irix-4.0.5 gets non-ANSI ctype macros unless using -ansi.
AC_TRY_RUN([#include <ctype.h>
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#ifndef HAVE_EBCDIC
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#	define ISLOWER(c) ('a' <= (c) && (c) <= 'z')
#	define TOUPPER(c) (ISLOWER(c) ? 'A' + ((c) - 'a') : (c))
#else
#	define ISLOWER(c) (('a' <= (c) && (c) <= 'i') \
		|| ('j' <= (c) && (c) <= 'r') \
		|| ('s' <= (c) && (c) <= 'z'))
#	define TOUPPER(c)	(ISLOWER(c) ? ((c) | 0x40) : (c))
#endif
#define XOR(e, f) (((e) && !(f)) || (!(e) && (f)))
int main () { int i; for (i = 0; i < 256; i++)
if (XOR (islower (i), ISLOWER (i)) || toupper (i) != TOUPPER (i)) exit(2);
exit (0); }
], , ol_cv_header_stdc=no, :)
fi])
if test $ol_cv_header_stdc = yes; then
  AC_DEFINE(STDC_HEADERS)
fi
ac_cv_header_stdc=disable
])
dnl
dnl ====================================================================
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dnl Check if struct passwd has pw_gecos
AC_DEFUN([OL_STRUCT_PASSWD_PW_GECOS], [# test for pw_gecos in struct passwd
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AC_CACHE_CHECK([struct passwd for pw_gecos],ol_cv_struct_passwd_pw_gecos,[
	AC_TRY_COMPILE([#include <pwd.h>],[
	struct passwd pwd;
	pwd.pw_gecos = pwd.pw_name;
],
	[ol_cv_struct_passwd_pw_gecos=yes],
	[ol_cv_struct_passwd_pw_gecos=no])])
if test $ol_cv_struct_passwd_pw_gecos = yes ; then
	AC_DEFINE(HAVE_PW_GECOS,1, [define if struct passwd has pw_gecos])
fi
])
dnl
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dnl --------------------------------------------------------------------
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dnl Check if struct passwd has pw_passwd
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AC_DEFUN([OL_STRUCT_PASSWD_PW_PASSWD], [# test for pw_passwd in struct passwd
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AC_CACHE_CHECK([struct passwd for pw_passwd],ol_cv_struct_passwd_pw_passwd,[
	AC_TRY_COMPILE([#include <pwd.h>],[
	struct passwd pwd;
	pwd.pw_passwd = pwd.pw_name;
],
	[ol_cv_struct_passwd_pw_passwd=yes],
	[ol_cv_struct_passwd_pw_passwd=no])])
if test $ol_cv_struct_passwd_pw_passwd = yes ; then
	AC_DEFINE(HAVE_PW_PASSWD,1, [define if struct passwd has pw_passwd])
fi
])
dnl
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dnl ====================================================================
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dnl Berkeley DB macros
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dnl
dnl --------------------------------------------------------------------
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dnl Try to link
AC_DEFUN([OL_BERKELEY_DB_TRY],
[if test $ol_cv_lib_db = no ; then
	AC_CACHE_CHECK([for Berkeley DB link (]ifelse($2,,default,$2)[)],[$1],
[
	ol_DB_LIB=ifelse($2,,,$2)
	ol_LIBS=$LIBS
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	LIBS="$ol_DB_LIB $LTHREAD_LIBS $LIBS"
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	AC_TRY_LINK([
#ifdef HAVE_DB_185_H
# include <db_185.h>
#else
# include <db.h>
#endif

#ifndef DB_VERSION_MAJOR
# define DB_VERSION_MAJOR 1
#endif

#ifndef NULL
#define NULL ((void*)0)
#endif
],[
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#if DB_VERSION_MAJOR > 1
	{
		char *version;
		int major, minor, patch;

		version = db_version( &major, &minor, &patch );

		if( major != DB_VERSION_MAJOR ||
			minor < DB_VERSION_MINOR )
		{
			printf("Berkeley DB version mismatch\n"
				"\texpected: %s\n\tgot: %s\n",
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				DB_VERSION_STRING, version);
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			return 1;
		}
	}
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#endif
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#if DB_VERSION_MAJOR > 2
	db_env_create( NULL, 0 );
#elif DB_VERSION_MAJOR > 1
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	db_appexit( NULL );
#else
	(void) dbopen( NULL, 0, 0, 0, NULL);
#endif
],[$1=yes],[$1=no])

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	LIBS="$ol_LIBS"
])
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	if test $$1 = yes ; then
		ol_cv_lib_db=ifelse($2,,yes,$2)
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	fi
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fi
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])
dnl
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dnl --------------------------------------------------------------------
dnl Try to locate appropriate library
AC_DEFUN([OL_BERKELEY_DB_LINK],
[ol_cv_lib_db=no
OL_BERKELEY_DB_TRY(ol_cv_db_none)
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OL_BERKELEY_DB_TRY(ol_cv_db_db42,[-ldb42])
OL_BERKELEY_DB_TRY(ol_cv_db_db_42,[-ldb-42])
OL_BERKELEY_DB_TRY(ol_cv_db_db_4_dot_2,[-ldb-4.2])
OL_BERKELEY_DB_TRY(ol_cv_db_db_4_2,[-ldb-4-2])
OL_BERKELEY_DB_TRY(ol_cv_db_db_4,[-ldb-4])
OL_BERKELEY_DB_TRY(ol_cv_db_db4,[-ldb4])
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OL_BERKELEY_DB_TRY(ol_cv_db_db41,[-ldb41])
OL_BERKELEY_DB_TRY(ol_cv_db_db_41,[-ldb-41])
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OL_BERKELEY_DB_TRY(ol_cv_db_db_4_dot_1,[-ldb-4.1])
OL_BERKELEY_DB_TRY(ol_cv_db_db_4_1,[-ldb-4-1])
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OL_BERKELEY_DB_TRY(ol_cv_db_db_4,[-ldb-4])
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OL_BERKELEY_DB_TRY(ol_cv_db_db,[-ldb])
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OL_BERKELEY_DB_TRY(ol_cv_db_db3,[-ldb3])
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OL_BERKELEY_DB_TRY(ol_cv_db_db_3,[-ldb-3])
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OL_BERKELEY_DB_TRY(ol_cv_db_db2,[-ldb2])
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OL_BERKELEY_DB_TRY(ol_cv_db_db_2,[-ldb-2])
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OL_BERKELEY_DB_TRY(ol_cv_db_db1,[-ldb1])
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OL_BERKELEY_DB_TRY(ol_cv_db_db_1,[-ldb-1])
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])
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dnl
dnl --------------------------------------------------------------------
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dnl Check if Berkeley DB supports DB_THREAD
AC_DEFUN([OL_BERKELEY_DB_THREAD],
[AC_CACHE_CHECK([for Berkeley DB thread support], [ol_cv_berkeley_db_thread], [
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	ol_LIBS="$LIBS"
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	LIBS="$LTHREAD_LIBS $LIBS"
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	if test $ol_cv_lib_db != yes ; then
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		LIBS="$ol_cv_lib_db $LIBS"
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	fi

	AC_TRY_RUN([
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#ifdef HAVE_DB_185_H
	choke me;
#else
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#include <db.h>
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#endif
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#ifndef NULL
#define NULL ((void *)0)
#endif
main()
{
	int rc;
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	u_int32_t flags = DB_CREATE |
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#ifdef DB_PRIVATE
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		DB_PRIVATE |
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#endif
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		DB_THREAD;
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#if DB_VERSION_MAJOR > 2
	DB_ENV *env = NULL;

	rc = db_env_create( &env, 0 );

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	flags |= DB_INIT_MPOOL;
#ifdef DB_MPOOL_PRIVATE
	flags |= DB_MPOOL_PRIVATE;
#endif

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	if( rc ) {
		printf("BerkeleyDB: %s\n", db_strerror(rc) );
		return rc;
	}
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#if (DB_VERSION_MAJOR > 3) || (DB_VERSION_MINOR >= 1)
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	rc = env->open( env, NULL, flags, 0 );
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#else
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	rc = env->open( env, NULL, NULL, flags, 0 );
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#endif
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	if ( rc == 0 ) {
		rc = env->close( env, 0 );
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	}

	if( rc ) {
		printf("BerkeleyDB: %s\n", db_strerror(rc) );
		return rc;
	}
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#else
	DB_ENV env;
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	memset( &env, '\0', sizeof(env) );

	rc = db_appinit( NULL, NULL, &env, flags );

	if( rc == 0 ) {
		db_appexit( &env );
	}
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	unlink("__db_mpool.share");
	unlink("__db_lock.share");
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#endif
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	return rc;
}],
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	[ol_cv_berkeley_db_thread=yes],
	[ol_cv_berkeley_db_thread=no],
	[ol_cv_berkeley_db_thread=cross])
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	LIBS="$ol_LIBS"
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])
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	if test $ol_cv_berkeley_db_thread != no ; then
		AC_DEFINE(HAVE_BERKELEY_DB_THREAD, 1,
			[define if Berkeley DB has DB_THREAD support])
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	fi
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])dnl
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dnl
dnl --------------------------------------------------------------------
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dnl Find any DB
AC_DEFUN([OL_BERKELEY_DB],
[ol_cv_berkeley_db=no
AC_CHECK_HEADERS(db.h)
if test $ac_cv_header_db_h = yes; then
	OL_BERKELEY_DB_LINK
	if test "$ol_cv_lib_db" != no ; then
		ol_cv_berkeley_db=yes
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		OL_BERKELEY_DB_THREAD
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	fi
fi
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])
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dnl --------------------------------------------------------------------
dnl Check for version compatility with back-bdb
AC_DEFUN([OL_BDB_COMPAT],
[AC_CACHE_CHECK([Berkeley DB version for BDB backend], [ol_cv_bdb_compat],[
	AC_EGREP_CPP(__db_version_compat,[
#include <db.h>

 /* this check could be improved */
#ifndef DB_VERSION_MAJOR
#	define DB_VERSION_MAJOR 1
#endif
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#ifndef DB_VERSION_MINOR
#	define DB_VERSION_MINOR 0
#endif
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/* require 4.2 or later */
#if (DB_VERSION_MAJOR >= 4) && (DB_VERSION_MINOR >= 2)
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	__db_version_compat
#endif
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	], [ol_cv_bdb_compat=yes], [ol_cv_bdb_compat=no])])
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])

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dnl --------------------------------------------------------------------
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dnl Find old Berkeley DB 1.85/1.86
AC_DEFUN([OL_BERKELEY_COMPAT_DB],
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[AC_CHECK_HEADERS(db_185.h db.h)
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if test $ac_cv_header_db_185_h = yes -o $ac_cv_header_db_h = yes; then
	AC_CACHE_CHECK([if Berkeley DB header compatibility], [ol_cv_header_db1],[
		AC_EGREP_CPP(__db_version_1,[
#if HAVE_DB_185_H
#	include <db_185.h>
#else
#	include <db.h>
#endif

 /* this check could be improved */
#ifndef DB_VERSION_MAJOR
#	define DB_VERSION_MAJOR 1
#endif

#if DB_VERSION_MAJOR == 1 
	__db_version_1
#endif
],	[ol_cv_header_db1=yes], [ol_cv_header_db1=no])])

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	if test $ol_cv_header_db1 = yes ; then
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		OL_BERKELEY_DB_LINK
		if test "$ol_cv_lib_db" != no ; then
			ol_cv_berkeley_db=yes
		fi
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	fi
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fi
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])
dnl
dnl ====================================================================
dnl Check if GDBM library exists
dnl Check for gdbm_open in standard libraries or -lgdbm
dnl
dnl defines ol_cv_lib_gdbm to 'yes' or '-lgdbm' or 'no'
dnl		'yes' implies gdbm_open is in $LIBS
dnl
dnl uses:
dnl		AC_CHECK_FUNC(gdbm_open)
dnl		AC_CHECK_LIB(gdbm,gdbm_open)
dnl
AC_DEFUN([OL_LIB_GDBM],
[AC_CACHE_CHECK(for GDBM library, [ol_cv_lib_gdbm],
[	ol_LIBS="$LIBS"
	AC_CHECK_FUNC(gdbm_open,[ol_cv_lib_gdbm=yes], [
		AC_CHECK_LIB(gdbm,gdbm_open,[ol_cv_lib_gdbm=-lgdbm],[ol_cv_lib_gdbm=no])
	])
	LIBS="$ol_LIBS"
])
])dnl
dnl
dnl --------------------------------------------------------------------
dnl Check if GDBM exists
dnl
dnl defines ol_cv_gdbm to 'yes' or 'no'
dnl 
dnl uses:
dnl		OL_LIB_GDBM
dnl		AC_CHECK_HEADERS(gdbm.h)
dnl
AC_DEFUN([OL_GDBM],
[AC_REQUIRE([OL_LIB_GDBM])
 AC_CHECK_HEADERS(gdbm.h)
 AC_CACHE_CHECK(for db, [ol_cv_gdbm], [
	if test $ol_cv_lib_gdbm = no -o $ac_cv_header_gdbm_h = no ; then
		ol_cv_gdbm=no
	else
		ol_cv_gdbm=yes
	fi
])
 if test $ol_cv_gdbm = yes ; then
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	AC_DEFINE(HAVE_GDBM,1, [define if GNU DBM is available])
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 fi
])dnl
dnl
dnl ====================================================================
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dnl Check if MDBM library exists
dnl Check for mdbm_open in standard libraries or -lmdbm
dnl
dnl defines ol_cv_lib_mdbm to 'yes' or '-lmdbm' or 'no'
dnl		'yes' implies mdbm_open is in $LIBS
dnl
dnl uses:
dnl		AC_CHECK_FUNC(mdbm_set_chain)
dnl		AC_CHECK_LIB(mdbm,mdbm_set_chain)
dnl
AC_DEFUN([OL_LIB_MDBM],
[AC_CACHE_CHECK(for MDBM library, [ol_cv_lib_mdbm],
[	ol_LIBS="$LIBS"
	AC_CHECK_FUNC(mdbm_set_chain,[ol_cv_lib_mdbm=yes], [
		AC_CHECK_LIB(mdbm,mdbm_set_chain,[ol_cv_lib_mdbm=-lmdbm],[ol_cv_lib_mdbm=no])
	])
	LIBS="$ol_LIBS"
])
])dnl
dnl
dnl --------------------------------------------------------------------
dnl Check if MDBM exists
dnl
dnl defines ol_cv_mdbm to 'yes' or 'no'
dnl 
dnl uses:
dnl		OL_LIB_MDBM
dnl		AC_CHECK_HEADERS(mdbm.h)
dnl
AC_DEFUN([OL_MDBM],
[AC_REQUIRE([OL_LIB_MDBM])
 AC_CHECK_HEADERS(mdbm.h)
 AC_CACHE_CHECK(for db, [ol_cv_mdbm], [
	if test $ol_cv_lib_mdbm = no -o $ac_cv_header_mdbm_h = no ; then
		ol_cv_mdbm=no
	else
		ol_cv_mdbm=yes
	fi
])
 if test $ol_cv_mdbm = yes ; then
	AC_DEFINE(HAVE_MDBM,1, [define if MDBM is available])
 fi
])dnl
dnl
dnl ====================================================================
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dnl Check if NDBM library exists
dnl Check for dbm_open in standard libraries or -lndbm or -ldbm
dnl
dnl defines ol_cv_lib_ndbm to 'yes' or '-lndbm' or -ldbm or 'no'
dnl		'yes' implies ndbm_open is in $LIBS
dnl
dnl uses:
dnl		AC_CHECK_FUNC(dbm_open)
dnl		AC_CHECK_LIB(ndbm,dbm_open)
dnl		AC_CHECK_LIB(dbm,dbm_open)
dnl
dnl restrictions:
dnl		should also check SVR4 case: dbm_open() in -lucb but that
dnl		would requiring dealing with -L/usr/ucblib
dnl
AC_DEFUN([OL_LIB_NDBM],
[AC_CACHE_CHECK(for NDBM library, [ol_cv_lib_ndbm],
[	ol_LIBS="$LIBS"
	AC_CHECK_FUNC(dbm_open,[ol_cv_lib_ndbm=yes], [
		AC_CHECK_LIB(ndbm,dbm_open,[ol_cv_lib_ndbm=-lndbm], [
			AC_CHECK_LIB(dbm,dbm_open,[ol_cv_lib_ndbm=-ldbm],
				[ol_cv_lib_ndbm=no])dnl
		])
	])
	LIBS="$ol_LIBS"
])
])dnl
dnl
dnl --------------------------------------------------------------------
dnl Check if NDBM exists
dnl
dnl defines ol_cv_ndbm to 'yes' or 'no'
dnl 
dnl uses:
dnl		OL_LIB_NDBM
dnl		AC_CHECK_HEADERS(ndbm.h)
dnl
dnl restrictions:
dnl		Doesn't handle SVR4 case (see above)
dnl
AC_DEFUN([OL_NDBM],
[AC_REQUIRE([OL_LIB_NDBM])
 AC_CHECK_HEADERS(ndbm.h)
 AC_CACHE_CHECK(for db, [ol_cv_ndbm], [
	if test $ol_cv_lib_ndbm = no -o $ac_cv_header_ndbm_h = no ; then
		ol_cv_ndbm=no
	else
		ol_cv_ndbm=yes
	fi
])
 if test $ol_cv_ndbm = yes ; then
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	AC_DEFINE(HAVE_NDBM,1, [define if NDBM is available])
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 fi
])dnl
dnl
dnl ====================================================================
dnl Check POSIX Thread version 
dnl
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dnl defines ol_cv_pthread_version to 4, 5, 6, 7, 8, 10, depending on the
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dnl	version of the POSIX.4a Draft that is implemented.
dnl	10 == POSIX.4a Final == POSIX.1c-1996 for our purposes.
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dnl	Existence of pthread.h should be tested separately.
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dnl tests:
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dnl	pthread_detach() was dropped in Draft 8, it is present
dnl		in every other version
dnl	PTHREAD_CREATE_UNDETACHED is only in Draft 7, it was called
dnl		PTHREAD_CREATE_JOINABLE after that
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dnl	pthread_attr_create was renamed to pthread_attr_init in Draft 6.
dnl		Draft 6-10 has _init, Draft 4-5 has _create.
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dnl	pthread_attr_default was dropped in Draft 6, only 4 and 5 have it
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dnl	PTHREAD_MUTEX_INITIALIZER was introduced in Draft 5. It's not
dnl		interesting to us because we don't try to statically
dnl		initialize mutexes. 5-10 has it.
dnl
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dnl Draft 9 and 10 are equivalent for our purposes.
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dnl
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AC_DEFUN([OL_POSIX_THREAD_VERSION],
[AC_CACHE_CHECK([POSIX thread version],[ol_cv_pthread_version],[
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	AC_TRY_COMPILE([
#		include <pthread.h>
	],[
		int i = PTHREAD_CREATE_JOINABLE;
	],[
	AC_EGREP_HEADER(pthread_detach,pthread.h,
	ol_cv_pthread_version=10, ol_cv_pthread_version=8)],[
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	AC_EGREP_CPP(draft7,[
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#		ifdef PTHREAD_CREATE_UNDETACHED
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		draft7
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#		endif
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	], ol_cv_pthread_version=7, [
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	AC_EGREP_HEADER(pthread_attr_init,pthread.h,
	ol_cv_pthread_version=6, [
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	AC_EGREP_CPP(draft5,[
#		include <pthread.h>
#ifdef		PTHREAD_MUTEX_INITIALIZER
		draft5
#endif
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	], ol_cv_pthread_version=5, ol_cv_pthread_version=4) ]) ]) ])
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])
])dnl
dnl
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dnl --------------------------------------------------------------------
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AC_DEFUN([OL_PTHREAD_TEST_INCLUDES],
[/* pthread test headers */
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#include <pthread.h>
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#if HAVE_PTHREADS < 7
#include <errno.h>
#endif
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#ifndef NULL
#define NULL (void*)0
#endif
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static void *task(p)
	void *p;
{
	return (void *) (p == NULL);
}
])
AC_DEFUN([OL_PTHREAD_TEST_FUNCTION],[
	/* pthread test function */
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#ifndef PTHREAD_CREATE_DETACHED
#define	PTHREAD_CREATE_DETACHED	1
#endif
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	pthread_t t;
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	int status;
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	int detach = PTHREAD_CREATE_DETACHED;
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#if HAVE_PTHREADS > 4
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	/* Final pthreads */
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	pthread_attr_t attr;
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	status = pthread_attr_init(&attr);
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	if( status ) return status;
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#if HAVE_PTHREADS < 7
	status = pthread_attr_setdetachstate(&attr, &detach);
	if( status < 0 ) status = errno;
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#else
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	status = pthread_attr_setdetachstate(&attr, detach);
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#endif
	if( status ) return status;
	status = pthread_create( &t, &attr, task, NULL );
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#if HAVE_PTHREADS < 7
	if( status < 0 ) status = errno;
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#endif
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	if( status ) return status;
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#else
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	/* Draft 4 pthreads */
	status = pthread_create( &t, pthread_attr_default, task, NULL );
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	if( status ) return errno;
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	/* give thread a chance to complete */
	/* it should remain joinable and hence detachable */
	sleep( 1 );
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	status = pthread_detach( &t );
	if( status ) return errno;
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#endif
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#ifdef HAVE_LINUX_THREADS
	pthread_kill_other_threads_np();
#endif
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	return 0;
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])

AC_DEFUN([OL_PTHREAD_TEST_PROGRAM],
[OL_PTHREAD_TEST_INCLUDES

int main(argc, argv)
	int argc;
	char **argv;
{
OL_PTHREAD_TEST_FUNCTION
}
])
dnl --------------------------------------------------------------------
AC_DEFUN([OL_PTHREAD_TRY], [# Pthread try link: $1 ($2)
if test "$ol_link_threads" = no ; then
	# try $1
	AC_CACHE_CHECK([for pthread link with $1], [$2], [
		# save the flags
		ol_LIBS="$LIBS"
		LIBS="$1 $LIBS"

		AC_TRY_RUN(OL_PTHREAD_TEST_PROGRAM,
			[$2=yes], [$2=no],
			[AC_TRY_LINK(OL_PTHREAD_TEST_INCLUDES,OL_PTHREAD_TEST_FUNCTION,
				[$2=yes], [$2=no])])
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		# restore the LIBS
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		LIBS="$ol_LIBS"
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	])
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	if test $$2 = yes ; then
		ol_link_pthreads="$1"
		ol_link_threads=posix
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	fi
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fi
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])
dnl
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dnl ====================================================================
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dnl Check GNU Pth pthread Header
dnl
dnl defines ol_cv_header linux_threads to 'yes' or 'no'
dnl		'no' implies pthreads.h is not LinuxThreads or pthreads.h
dnl		doesn't exists.  Existance of pthread.h should separately
dnl		checked.
dnl 
AC_DEFUN([OL_HEADER_GNU_PTH_PTHREAD_H], [
	AC_CACHE_CHECK([for GNU Pth pthread.h],
		[ol_cv_header_gnu_pth_pthread_h],
		[AC_EGREP_CPP(__gnu_pth__,
			[#include <pthread.h>
#ifdef _POSIX_THREAD_IS_GNU_PTH
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	__gnu_pth__;
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#endif
],
			[ol_cv_header_gnu_pth_pthread_h=yes],
			[ol_cv_header_gnu_pth_pthread_h=no])
		])
])dnl
dnl ====================================================================
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dnl Check for NT Threads
AC_DEFUN([OL_NT_THREADS], [
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	AC_CHECK_FUNC(_beginthread)
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	if test $ac_cv_func__beginthread = yes ; then
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		AC_DEFINE(HAVE_NT_THREADS,1,[if you have NT Threads])
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		ol_cv_nt_threads=yes
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	fi
])
dnl ====================================================================
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dnl Check LinuxThreads Header
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dnl
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dnl defines ol_cv_header linux_threads to 'yes' or 'no'
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dnl		'no' implies pthreads.h is not LinuxThreads or pthreads.h
dnl		doesn't exists.  Existance of pthread.h should separately
dnl		checked.
dnl 
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AC_DEFUN([OL_HEADER_LINUX_THREADS], [
	AC_CACHE_CHECK([for LinuxThreads pthread.h],
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		[ol_cv_header_linux_threads],
		[AC_EGREP_CPP(pthread_kill_other_threads_np,
			[#include <pthread.h>],
			[ol_cv_header_linux_threads=yes],
			[ol_cv_header_linux_threads=no])
		])
	if test $ol_cv_header_linux_threads = yes; then
		AC_DEFINE(HAVE_LINUX_THREADS,1,[if you have LinuxThreads])
	fi
])dnl
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dnl --------------------------------------------------------------------
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dnl	Check LinuxThreads Implementation
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dnl
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dnl	defines ol_cv_sys_linux_threads to 'yes' or 'no'
dnl	'no' implies pthreads implementation is not LinuxThreads.
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dnl 
AC_DEFUN([OL_SYS_LINUX_THREADS], [
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	AC_CHECK_FUNCS(pthread_kill_other_threads_np)
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	AC_CACHE_CHECK([for LinuxThreads implementation],
		[ol_cv_sys_linux_threads],
		[ol_cv_sys_linux_threads=$ac_cv_func_pthread_kill_other_threads_np])
])dnl
dnl
dnl --------------------------------------------------------------------
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dnl Check LinuxThreads consistency
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AC_DEFUN([OL_LINUX_THREADS], [
	AC_REQUIRE([OL_HEADER_LINUX_THREADS])
	AC_REQUIRE([OL_SYS_LINUX_THREADS])
	AC_CACHE_CHECK([for LinuxThreads consistency], [ol_cv_linux_threads], [
		if test $ol_cv_header_linux_threads = yes -a \
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			$ol_cv_sys_linux_threads = yes; then
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			ol_cv_linux_threads=yes
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		elif test $ol_cv_header_linux_threads = no -a \
			$ol_cv_sys_linux_threads = no; then
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			ol_cv_linux_threads=no
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		else
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			ol_cv_linux_threads=error
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		fi
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	])
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])dnl
dnl
dnl ====================================================================
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dnl Check for POSIX Regex
AC_DEFUN([OL_POSIX_REGEX], [
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AC_CACHE_CHECK([for compatible POSIX regex],ol_cv_c_posix_regex,[
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	AC_TRY_RUN([
#include <sys/types.h>
#include <regex.h>
static char *pattern, *string;
main()
{
	int rc;
	regex_t re;

	pattern = "^A";

	if(regcomp(&re, pattern, 0)) {
		return -1;
	}
	
	string = "ALL MATCH";
	
	rc = regexec(&re, string, 0, (void*)0, 0);

	regfree(&re);

	return rc;
}],
	[ol_cv_c_posix_regex=yes],
	[ol_cv_c_posix_regex=no],
	[ol_cv_c_posix_regex=cross])])
])
dnl
dnl ====================================================================
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dnl Check if toupper() requires islower() to be called first
AC_DEFUN([OL_C_UPPER_LOWER],
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[AC_CACHE_CHECK([if toupper() requires islower()],ol_cv_c_upper_lower,[
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	AC_TRY_RUN([
#include <ctype.h>
main()
{
	if ('C' == toupper('C'))
		exit(0);
	else
		exit(1);
}],
	[ol_cv_c_upper_lower=no],
	[ol_cv_c_upper_lower=yes],
	[ol_cv_c_upper_lower=safe])])
if test $ol_cv_c_upper_lower != no ; then
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	AC_DEFINE(C_UPPER_LOWER,1, [define if toupper() requires islower()])
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fi
])
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dnl
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dnl ====================================================================
dnl Check for declaration of sys_errlist in one of stdio.h and errno.h.
dnl Declaration of sys_errlist on BSD4.4 interferes with our declaration.
dnl Reported by Keith Bostic.
AC_DEFUN([OL_SYS_ERRLIST],
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	AC_TRY_COMPILE([
#include <stdio.h>
#include <sys/types.h>
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#include <errno.h>
#ifdef WINNT
#include <stdlib.h>
#endif ],
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	[char *c = (char *) *sys_errlist],
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	ol_cv_have_sys_errlist=yes],
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	[ol_cv_dcl_sys_errlist=no])])
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#
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# It's possible (for near-UNIX clones) that sys_errlist doesn't exist
if test $ol_cv_dcl_sys_errlist = no ; then
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	AC_DEFINE(DECL_SYS_ERRLIST,1,
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	AC_CACHE_CHECK([existence of sys_errlist],ol_cv_have_sys_errlist,[
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		AC_TRY_LINK([#include <errno.h>],
			[char *c = (char *) *sys_errlist],
			[ol_cv_have_sys_errlist=yes],
			[ol_cv_have_sys_errlist=no])])
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fi
if test $ol_cv_have_sys_errlist = yes ; then
	AC_DEFINE(HAVE_SYS_ERRLIST,1,
		[define if you actually have sys_errlist in your libs])
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fi
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])dnl
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dnl ====================================================================
dnl Early MIPS compilers (used in Ultrix 4.2) don't like
dnl "int x; int *volatile a = &x; *a = 0;"
dnl 	-- borrowed from PDKSH
AC_DEFUN(OL_C_VOLATILE,
 [AC_CACHE_CHECK(if compiler understands volatile, ol_cv_c_volatile,
    [AC_TRY_COMPILE([int x, y, z;],
      [volatile int a; int * volatile b = x ? &y : &z;
      /* Older MIPS compilers (eg., in Ultrix 4.2) don't like *b = 0 */
      *b = 0;], ol_cv_c_volatile=yes, ol_cv_c_volatile=no)])
  if test $ol_cv_c_volatile = yes; then
    : 
  else
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    AC_DEFINE(volatile,,[define as empty if volatile is not supported])
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  fi
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dnl ====================================================================
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dnl Look for fetch(3)
AC_DEFUN([OL_LIB_FETCH],
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[ol_LIBS=$LIBS
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LIBS="-lfetch -lcom_err $LIBS"
AC_CACHE_CHECK([fetch(3) library],ol_cv_lib_fetch,[
	AC_TRY_LINK([
#include <sys/param.h>
#include <stdio.h>
#include <fetch.h>],
	[struct url *u = fetchParseURL("file:///"); ],
	[ol_cv_lib_fetch=yes],
	[ol_cv_lib_fetch=no])])
LIBS=$ol_LIBS
if test $ol_cv_lib_fetch != no ; then
	ol_link_fetch="-lfetch -lcom_err"
	AC_DEFINE(HAVE_FETCH,1,
		[define if you actually have FreeBSD fetch(3)])
fi
])dnl
dnl
dnl ====================================================================
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dnl Define sig_atomic_t if not defined in signal.h
AC_DEFUN(OL_TYPE_SIG_ATOMIC_T,
 [AC_CACHE_CHECK(for sig_atomic_t, ol_cv_type_sig_atomic_t,
    [AC_TRY_COMPILE([#include <signal.h>], [sig_atomic_t atomic;],
		ol_cv_type_sig_atomic_t=yes, ol_cv_type_sig_atomic_t=no)])
  if test $ol_cv_type_sig_atomic_t = no; then
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    AC_DEFINE(sig_atomic_t,int,
		[define to atomic type if sig_atomic_t is not available])
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  fi
 ])dnl
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dnl
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dnl ====================================================================
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dnl Define socklen_t if not defined in sys/types.h or sys/socket.h
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AC_DEFUN(OL_TYPE_SOCKLEN_T,
 [AC_CACHE_CHECK(for socklen_t, ol_cv_type_socklen_t,
    [AC_TRY_COMPILE([
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
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#ifdef HAVE_SYS_SOCKET_H
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#include <sys/socket.h>
#endif
], [socklen_t len;],
		ol_cv_type_socklen_t=yes, ol_cv_type_socklen_t=no)])
  if test $ol_cv_type_socklen_t = no; then
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    AC_DEFINE(socklen_t, int,
		[define to int if socklen_t is not available])
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  fi
 ])dnl
dnl
dnl ====================================================================
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dnl Define inet_aton is available
AC_DEFUN(OL_FUNC_INET_ATON,
 [AC_CACHE_CHECK([for inet_aton()], ol_cv_func_inet_aton,
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    [AC_TRY_LINK([
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#ifdef HAVE_SYS_TYPES_H
#	include <sys/types.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#	include <sys/socket.h>
#	ifdef HAVE_SYS_SELECT_H
#		include <sys/select.h>
#	endif
#	include <netinet/in.h>
#	ifdef HAVE_ARPA_INET_H
#		include <arpa/inet.h>
#	endif
#endif
], [struct in_addr in;
int rc = inet_aton( "255.255.255.255", &in );],
		ol_cv_func_inet_aton=yes, ol_cv_func_inet_aton=no)])
  if test $ol_cv_func_inet_aton != no; then
    AC_DEFINE(HAVE_INET_ATON, 1,
		[define to you inet_aton(3) is available])
  fi
 ])dnl
dnl
dnl ====================================================================
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dnl check no of arguments for ctime_r
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AC_DEFUN(OL_FUNC_CTIME_R_NARGS,
 [AC_CACHE_CHECK(number of arguments of ctime_r, ol_cv_func_ctime_r_nargs,
   [AC_TRY_COMPILE([#include <time.h>],
		[time_t ti; char *buffer; ctime_r(&ti,buffer,32);],
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			ol_cv_func_ctime_r_nargs3=yes,
			ol_cv_func_ctime_r_nargs3=no)

	AC_TRY_COMPILE([#include <time.h>],
		[time_t ti; char *buffer; ctime_r(&ti,buffer);],
			ol_cv_func_ctime_r_nargs2=yes,
			ol_cv_func_ctime_r_nargs2=no)

	if test $ol_cv_func_ctime_r_nargs3 = yes -a \
		$ol_cv_func_ctime_r_nargs2 = no ; then

		ol_cv_func_ctime_r_nargs=3

	elif test $ol_cv_func_ctime_r_nargs3 = no -a \
		$ol_cv_func_ctime_r_nargs2 = yes ; then

		ol_cv_func_ctime_r_nargs=2

	else
		ol_cv_func_ctime_r_nargs=0
	fi
  ])

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  if test $ol_cv_func_ctime_r_nargs -gt 1 ; then
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 	AC_DEFINE_UNQUOTED(CTIME_R_NARGS, $ol_cv_func_ctime_r_nargs,
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		[set to the number of arguments ctime_r() expects])
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  fi
])dnl
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dnl
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dnl --------------------------------------------------------------------
dnl check return type of ctime_r()
AC_DEFUN(OL_FUNC_CTIME_R_TYPE,
 [AC_CACHE_CHECK(return type of ctime_r, ol_cv_func_ctime_r_type,
   [AC_TRY_COMPILE([#include <time.h>],
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		[extern int (ctime_r)();],
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			ol_cv_func_ctime_r_type="int", ol_cv_func_ctime_r_type="charp")
	])
  if test $ol_cv_func_ctime_r_type = "int" ; then
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	AC_DEFINE(CTIME_R_RETURNS_INT,1, [define if ctime_r() returns int])
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  fi
])dnl
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dnl ====================================================================
dnl check no of arguments for gethostbyname_r
AC_DEFUN(OL_FUNC_GETHOSTBYNAME_R_NARGS,
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 [AC_CACHE_CHECK(number of arguments of gethostbyname_r,
	ol_cv_func_gethostbyname_r_nargs,
	[AC_TRY_COMPILE([#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#define BUFSIZE (sizeof(struct hostent)+10)],
		[struct hostent hent; char buffer[BUFSIZE];
		int bufsize=BUFSIZE;int h_errno;
		(void)gethostbyname_r("segovia.cs.purdue.edu", &hent,
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			buffer, bufsize, &h_errno);],
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		ol_cv_func_gethostbyname_r_nargs5=yes, 
		ol_cv_func_gethostbyname_r_nargs5=no)

	AC_TRY_COMPILE([#include <sys/types.h>
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#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#define BUFSIZE (sizeof(struct hostent)+10)],
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		[struct hostent hent;struct hostent *rhent;
		char buffer[BUFSIZE];
		int bufsize=BUFSIZE;int h_errno;
		(void)gethostbyname_r("localhost", &hent, buffer, bufsize,
			&rhent, &h_errno);],
		ol_cv_func_gethostbyname_r_nargs6=yes,
		ol_cv_func_gethostbyname_r_nargs6=no)

	if test $ol_cv_func_gethostbyname_r_nargs5 = yes -a \
		$ol_cv_func_gethostbyname_r_nargs6 = no ; then

		ol_cv_func_gethostbyname_r_nargs=5

	elif test $ol_cv_func_gethostbyname_r_nargs5 = no -a \
		$ol_cv_func_gethostbyname_r_nargs6 = yes ; then

		ol_cv_func_gethostbyname_r_nargs=6

	else
		ol_cv_func_gethostbyname_r_nargs=0
	fi
  ])
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  if test $ol_cv_func_gethostbyname_r_nargs -gt 1 ; then
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	AC_DEFINE_UNQUOTED(GETHOSTBYNAME_R_NARGS,
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		$ol_cv_func_gethostbyname_r_nargs,
		[set to the number of arguments gethostbyname_r() expects])
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  fi
])dnl
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dnl
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dnl check no of arguments for gethostbyaddr_r
AC_DEFUN(OL_FUNC_GETHOSTBYADDR_R_NARGS,
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 [AC_CACHE_CHECK(number of arguments of gethostbyaddr_r,
	[ol_cv_func_gethostbyaddr_r_nargs],
	[AC_TRY_COMPILE([#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#define BUFSIZE (sizeof(struct hostent)+10)],
	   [struct hostent hent; char buffer[BUFSIZE]; 
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	    struct in_addr add;
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	    size_t alen=sizeof(struct in_addr);
	    int bufsize=BUFSIZE;int h_errno;
		(void)gethostbyaddr_r( (void *)&(add.s_addr),
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			alen, AF_INET, &hent, buffer, bufsize, &h_errno);],
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		ol_cv_func_gethostbyaddr_r_nargs7=yes,
		ol_cv_func_gethostbyaddr_r_nargs7=no)

	AC_TRY_COMPILE([#include <sys/types.h>
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#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#define BUFSIZE (sizeof(struct hostent)+10)],
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		[struct hostent hent;
		struct hostent *rhent; char buffer[BUFSIZE]; 
		struct in_addr add;
		size_t alen=sizeof(struct in_addr);
		int bufsize=BUFSIZE;int h_errno;
		(void)gethostbyaddr_r( (void *)&(add.s_addr),
			alen, AF_INET, &hent, buffer, bufsize, 
			&rhent, &h_errno);],
		ol_cv_func_gethostbyaddr_r_nargs8=yes,
		ol_cv_func_gethostbyaddr_r_nargs8=no)

	if test $ol_cv_func_gethostbyaddr_r_nargs7 = yes -a \
		$ol_cv_func_gethostbyaddr_r_nargs8 = no ; then

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		ol_cv_func_gethostbyaddr_r_nargs=7
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	elif test $ol_cv_func_gethostbyaddr_r_nargs7 = no -a \
		$ol_cv_func_gethostbyaddr_r_nargs8 = yes ; then

		ol_cv_func_gethostbyaddr_r_nargs=8

	else
		ol_cv_func_gethostbyaddr_r_nargs=0
	fi
  ])
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  if test $ol_cv_func_gethostbyaddr_r_nargs -gt 1 ; then
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    AC_DEFINE_UNQUOTED(GETHOSTBYADDR_R_NARGS,
		$ol_cv_func_gethostbyaddr_r_nargs,
		[set to the number of arguments gethostbyaddr_r() expects])
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  fi
])dnl
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dnl
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dnl --------------------------------------------------------------------
dnl Check for Cyrus SASL version compatility, need 2.1.3 or newer
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AC_DEFUN([OL_SASL_COMPAT],
[AC_CACHE_CHECK([Cyrus SASL library version], [ol_cv_sasl_compat],[
	AC_EGREP_CPP(__sasl_compat,[
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#ifdef HAVE_SASL_SASL_H
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#include <sasl/sasl.h>
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#else
#include <sasl.h>
#endif
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/* require 2.1.3 or later */
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#if SASL_VERSION_MAJOR == 2  && SASL_VERSION_MINOR > 1
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	char *__sasl_compat = "2.2+ or better okay (we guess)";
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#elif SASL_VERSION_MAJOR == 2  && SASL_VERSION_MINOR == 1 \
	&& SASL_VERSION_STEP >=3
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	char *__sasl_compat = "2.1.3+ or better okay";
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#endif
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	],	[ol_cv_sasl_compat=yes], [ol_cv_sasl_compat=no])])
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])
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dnl ====================================================================
dnl check for msg_accrights in msghdr
AC_DEFUN(OL_MSGHDR_MSG_ACCRIGHTS,
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 [AC_CACHE_CHECK(for msg_accrights in msghdr, ol_cv_msghdr_msg_accrights,
   [AC_TRY_COMPILE([#include <sys/socket.h>],
		[struct msghdr m; m.msg_accrightslen=0],
		ol_cv_msghdr_msg_accrights=yes, ol_cv_msghdr_msg_accrights=no)
	])
  if test $ol_cv_msghdr_msg_accrights = "yes" ; then
	AC_DEFINE(HAVE_MSGHDR_MSG_ACCRIGHTS,1,
		[define if struct msghdr has msg_accrights])
  fi
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])dnl