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# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
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#
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# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
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#
# See the COPYRIGHT file distributed with this work for additional
# information regarding copyright ownership.
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AC_INIT(BIND, [9.13], [info@isc.org], [], [https://www.isc.org/downloads/BIND/])
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AC_PREREQ([2.60])
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AC_CONFIG_HEADER(config.h)
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AC_CONFIG_MACRO_DIR([m4])
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AC_CANONICAL_HOST
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AC_USE_SYSTEM_EXTENSIONS

# Enable RFC 3542 APIs on macOS
AC_DEFINE([__APPLE_USE_RFC_3542], [1], [Select RFC3542 IPv6 API on macOS])
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AC_PROG_MAKE_SET
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AC_PROG_LIBTOOL
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AC_PROG_INSTALL
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AC_PROG_LN_S
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AX_POSIX_SHELL
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AC_SUBST(STD_CINCLUDES)
AC_SUBST(STD_CDEFINES)
AC_SUBST(STD_CWARNINGS)
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AC_SUBST(CCOPT)
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AC_SUBST(CCNOOPT)
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AC_SUBST(BACKTRACECFLAGS)
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#
# Use pkg-config
#

PKG_PROG_PKG_CONFIG

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# Warn if the user specified libbind, which is now deprecated
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AC_ARG_ENABLE(libbind, AS_HELP_STRING([--enable-libbind], [deprecated]))
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case "$enable_libbind" in
	yes)
		AC_MSG_ERROR(['libbind' is no longer part of the BIND 9 distribution.
It is available from http://www.isc.org as a separate download.])
		;;
	no|'')
		;;
esac

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AC_ARG_ENABLE(buffer_useinline,
	      AS_HELP_STRING([--enable-buffer-useinline],
		             [define ISC_BUFFER_USEINLINE when compiling
				[default=yes]]),
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	      if test yes = "${enable}"
	      then
		      AC_DEFINE([ISC_BUFFER_USEINLINE], [1],
			        [Define if you want to use inline buffers])
	      fi,
	      AC_DEFINE([ISC_BUFFER_USEINLINE], [1]))

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AC_ARG_ENABLE(warn_shadow,
	      AS_HELP_STRING([--enable-warn-shadow],
			     [turn on -Wshadow when compiling]))
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AC_ARG_ENABLE(warn_error,
	      AS_HELP_STRING([--enable-warn-error],
			    [turn on -Werror when compiling]))
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AC_ARG_ENABLE(developer,
	      AS_HELP_STRING([--enable-developer],
			     [enable developer build settings]))
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XTARGETS=
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case "$enable_developer" in
yes)
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	STD_CDEFINES="$STD_CDEFINES -DISC_MEM_DEFAULTFILL=1 -DISC_LIST_CHECKINIT=1"
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	test "${enable_fixed_rrset+set}" = set || enable_fixed_rrset=yes
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	test "${enable_querytrace+set}" = set || enable_querytrace=yes
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	test "${with_cmocka+set}" = set || with_cmocka=yes
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	test "${with_dlz_filesystem+set}" = set || with_dlz_filesystem=yes
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	test "${enable_symtable+set}" = set || enable_symtable=all
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	test "${enable_warn_error+set}" = set || enable_warn_error=yes
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	test "${enable_warn_shadow+set}" = set || enable_warn_shadow=yes
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	test "${with_zlib+set}" = set || with_zlib=yes
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	XTARGETS='${XTARGETS}'
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	;;
esac
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AC_SUBST(XTARGETS)
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AC_ARG_ENABLE([fuzzing],
	      [AS_HELP_STRING([--enable-fuzzing=<afl|libfuzzer>],
			      [Enable fuzzing using American Fuzzy Lop or libFuzzer (default=no)])],
	      [],
	      [enable_fuzzing=no])

AC_MSG_CHECKING([whether to enable fuzzing mode])
AS_CASE([$enable_fuzzing],
	[no],[AC_MSG_RESULT([no])],
	[afl],[
	  AC_MSG_RESULT([using AFL])
	  AC_DEFINE([ENABLE_AFL], [1],
		    [Define to enable American Fuzzy Lop test harness])
	  CFLAGS="$CFLAGS -DFUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION=1"
	  LIBS="$LIBS -lpthread"],
	[libfuzzer],[
	  AC_MSG_RESULT([using libFuzzer])
	  CFLAGS="$CFLAGS -DFUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION=1 -fsanitize=fuzzer,address,undefined"
	  LDFLAGS="$LDFLAGS -fsanitize=fuzzer,address,undefined"],
	[*],[AC_MSG_ERROR([You need to explicitly select the fuzzer])])

AS_IF([test "$enable_fuzzing" = "afl"],
      [AC_MSG_CHECKING("for AFL enabled compiler")
       AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],
					  [#ifndef __AFL_COMPILER
					   #error AFL compiler required
					   #endif
					  ])],
			 [AC_MSG_RESULT([yes])],
			 [AC_MSG_ERROR([set CC=afl-<gcc|clang> when --enable-fuzzing=afl is used])])
      ])
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#
# Make very sure that these are the first files processed by
# config.status, since we use the processed output as the input for
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# AC_SUBST_FILE() substitutions in other files.
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#
AC_CONFIG_FILES([make/rules make/includes])

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AC_PATH_PROG(AR, ar)
ARFLAGS="cruv"
AC_SUBST(AR)
AC_SUBST(ARFLAGS)

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# The POSIX ln(1) program.  Non-POSIX systems may substitute
# "copy" or something.
LN=ln
AC_SUBST(LN)

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case "$AR" in
	"")
		AC_MSG_ERROR([
ar program not found.  Please fix your PATH to include the directory in
which ar resides, or set AR in the environment with the full path to ar.
])

		;;
esac

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#
# Etags.
#
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AC_PATH_PROGS(ETAGS, etags emacs-etags)
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#
# Some systems, e.g. RH7, have the Exuberant Ctags etags instead of
# GNU emacs etags, and it requires the -L flag.
#
if test "X$ETAGS" != "X"; then
	AC_MSG_CHECKING(for Exuberant Ctags etags)
	if $ETAGS --version 2>&1 | grep 'Exuberant Ctags' >/dev/null 2>&1; then
		AC_MSG_RESULT(yes)
		ETAGS="$ETAGS -L"
	else
		AC_MSG_RESULT(no)
	fi
fi
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AC_SUBST(ETAGS)

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#
# Perl is optional; it is used only by some of the system test scripts.
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# Note: the backtrace feature (see below) uses perl to build the symbol table,
# but it still compiles without perl, in which case an empty table will be used.
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#
AC_PATH_PROGS(PERL, perl5 perl)
AC_SUBST(PERL)

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#
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# Python is also optional but required by default so that dnssec-keymgr gets
# installed unless explicitly prevented by the user using --without-python.
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#
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testminvers='import sys
if (sys.version_info < (2,7)) or (sys.version_info < (3,2) and sys.version_info >= (3,0)):
   exit(1)'
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testargparse='try: import argparse
except: exit(1)'

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testply='try: import ply
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except: exit(1)'
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AC_ARG_WITH([python],
	    AS_HELP_STRING([--with-python=PATH],
			   [specify path to Python interpreter]),
	    [], [with_python="python python3 python3.7 python3.6 python3.5 python3.4 python3.3 python3.2 python2 python2.7"])
AC_ARG_WITH([python-install-dir],
	    AS_HELP_STRING([--with-python-install-dir=PATH],
			   [installation directory for Python modules]),
	    [], with_python_install_dir="")

AS_IF([test "$with_python" = "no"],
      [AC_MSG_CHECKING([for Python support])
       AC_MSG_RESULT([disabled])],
      [for p in $with_python
       do
	 AS_CASE([$p],
		 [/*],[PYTHON="$p"])

	 AC_PATH_PROG([PYTHON], [$p])
	 # Do not cache the result of the check from the previous line.  If the
	 # first found Python interpreter has missing module dependencies and
	 # the result of the above check is cached, subsequent module checks
	 # will erroneously keep on using the cached path to the first found
	 # Python interpreter instead of different ones.
	 unset ac_cv_path_PYTHON

	 AS_IF([test -z "$PYTHON"], [continue])

	 AC_MSG_CHECKING([if $PYTHON is python2 version >= 2.7 or python3 version >= 3.2])
	 AS_IF(["$PYTHON" -c "$testminvers" 2>/dev/null],
	       [AC_MSG_RESULT([yes])],
	       [AC_MSG_RESULT([no])
		unset PYTHON
		continue])

	 AC_MSG_CHECKING([Python module 'argparse'])
	 AS_IF(["$PYTHON" -c "$testargparse" 2>/dev/null],
	       [AC_MSG_RESULT([yes])],
	       [AC_MSG_RESULT([no])
		unset PYTHON
		continue])

	 AC_MSG_CHECKING([Python module 'ply'])
	 AS_IF(["$PYTHON" -c "$testply" 2>/dev/null],
	       [AC_MSG_RESULT([yes])],
	       [AC_MSG_RESULT([no])
		unset PYTHON
		continue])

	 # Stop looking any further once we find a Python interpreter
	 # satisfying all requirements.
	 break
       done

       AS_IF([test "X$PYTHON" = "X"],
	     [AC_MSG_CHECKING([for Python support])
	      AC_MSG_RESULT([no])
	      AC_MSG_ERROR([Python required for dnssec-keymgr])])])
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PYTHON_TOOLS=''
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CHECKDS=''
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COVERAGE=''
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KEYMGR=''
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AS_IF([test "X$PYTHON" != "X"],
      [PYTHON_TOOLS=python
       CHECKDS=checkds
       COVERAGE=coverage
       KEYMGR=keymgr
       PYTHON_INSTALL_DIR="$with_python_install_dir"
       AS_IF([test -n "$with_python_install_dir"],
	     [PYTHON_INSTALL_LIB="--install-lib=$with_python_install_dir"])])
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AC_SUBST(CHECKDS)
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AC_SUBST(COVERAGE)
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AC_SUBST(KEYMGR)
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AC_SUBST(PYTHON_TOOLS)
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AC_SUBST(PYTHON_INSTALL_DIR)
AC_SUBST(PYTHON_INSTALL_LIB)
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#
# Special processing of paths depending on whether --prefix,
# --sysconfdir or --localstatedir arguments were given.  What's
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# desired is some compatibility with the way previous versions
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# of BIND built; they defaulted to /usr/local for most parts of
# the installation, but named.boot/named.conf was in /etc
# and named.pid was in /var/run.
#
# So ... if none of --prefix, --sysconfdir or --localstatedir are
# specified, set things up that way.  If --prefix is given, use
# it for sysconfdir and localstatedir the way configure normally
# would.  To change the prefix for everything but leave named.conf
# in /etc or named.pid in /var/run, then do this the usual configure way:
# ./configure --prefix=/somewhere --sysconfdir=/etc
# ./configure --prefix=/somewhere --localstatedir=/var
#
# To put named.conf and named.pid in /usr/local with everything else,
# set the prefix explicitly to /usr/local even though that's the default:
# ./configure --prefix=/usr/local
#
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case "$prefix" in
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	NONE)
		case "$sysconfdir" in
			'${prefix}/etc')
				sysconfdir=/etc
				;;
		esac
		case "$localstatedir" in
			'${prefix}/var')
				localstatedir=/var
				;;
		esac
		;;
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esac
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expanded_sysconfdir=`eval echo $sysconfdir`
AC_SUBST(expanded_sysconfdir)
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#
# Make sure INSTALL uses an absolute path, else it will be wrong in all
# Makefiles, since they use make/rules.in and INSTALL will be adjusted by
# configure based on the location of the file where it is substituted.
# Since in BIND9 INSTALL is only substituted into make/rules.in, an immediate
# subdirectory of install-sh, This relative path will be wrong for all
# directories more than one level down from install-sh.
#
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case "$INSTALL" in
	/*)
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		;;
	*)
		#
		# Not all systems have dirname.
		#
		changequote({, })
		ac_dir="`echo $INSTALL | sed 's%/[^/]*$%%'`"
		changequote([, ])

		ac_prog="`echo $INSTALL | sed 's%.*/%%'`"
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		test "X$ac_dir" = "X$ac_prog" && ac_dir=.
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		test -d "$ac_dir" && ac_dir="`(cd \"$ac_dir\" && pwd)`"
		INSTALL="$ac_dir/$ac_prog"
		;;
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esac

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AC_PROG_CC
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AC_PROG_CC_C99
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#
# CCNOOPT defaults to -O0 on gcc and disables optimization when is last
#
if test "X$CCNOOPT" = "X" -a "X$GCC" = "Xyes"; then
	CCNOOPT="-O0"
fi

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AC_HEADER_STDC

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AC_CHECK_HEADERS(fcntl.h regex.h sys/time.h unistd.h sys/mman.h sys/sockio.h sys/select.h sys/param.h sys/sysctl.h net/if6.h sys/socket.h net/route.h linux/netlink.h linux/rtnetlink.h,,,
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[$ac_includes_default
#ifdef HAVE_SYS_PARAM_H
# include <sys/param.h>
#endif
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#ifdef HAVE_SYS_SOCKET_H
# include <sys/socket.h>
#endif
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])
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#
# Check for thread local storage
#
AC_CHECK_HEADERS([threads.h],
		 [
		     AC_MSG_CHECKING([for C11 Thread-Local Storage using thread_local])
		     AC_COMPILE_IFELSE(
			 [AC_LANG_PROGRAM(
			      [
				  #include <threads.h>
			      ],[
				  static thread_local int tls = 0;
				  return (tls);
			      ])
			 ],[
			     AC_MSG_RESULT([yes])
			     AC_DEFINE([HAVE_THREAD_LOCAL],[1],[Define if thread_local keyword is available])
			     AC_DEFINE([HAVE_TLS],[1],[Define if Thread-Local Storage is available])
			 ],[
			     AC_MSG_RESULT([no])
			 ])
		 ],[
		     AC_MSG_CHECKING([for Thread-Local Storage using __thread])
		     AC_COMPILE_IFELSE(
			 [AC_LANG_PROGRAM(
			      [
			      ],[
				  static __thread int tls = 0;
				  return (tls);
			      ])
			 ],[
			     AC_MSG_RESULT([yes])
			     AC_DEFINE([HAVE___THREAD],[1],[Define if __thread keyword is available])
			     AC_DEFINE([HAVE_TLS],[1],[Define if Thread-Local Storage is available])
			 ],[
			     AC_MSG_RESULT([no])
			 ])
		 ])

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AC_C_CONST
AC_C_INLINE
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AC_C_VOLATILE
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AC_C_FLEXIBLE_ARRAY_MEMBER
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#
# Check for yield support on ARM processors
#
AS_CASE([$host],
	[arm*],[
	  AC_MSG_CHECKING([for yield instruction support])
	  AC_COMPILE_IFELSE(
	    [AC_LANG_PROGRAM(
	       [[]],
	       [[__asm__ __volatile__ ("yield")]]
	     )],
	    [AC_MSG_RESULT([yes])],
	    [AC_MSG_ERROR([no, try adding -march=native or -march=armv7-a to CFLAGS (see PLATFORM.md for more information)])])])

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AC_CHECK_FUNCS([sysctlbyname])

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#
# Check for the existence of mmap to enable the fast format zones
#
AC_CHECK_FUNCS(mmap)

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#
# Older versions of HP/UX don't define seteuid() and setegid()
#
AC_CHECK_FUNCS(seteuid setresuid)
AC_CHECK_FUNCS(setegid setresgid)

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AC_TYPE_SIZE_T
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AC_TYPE_SSIZE_T
AC_TYPE_UINTPTR_T

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AC_HEADER_TIME

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#
# check for uname library routine
#
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AC_MSG_CHECKING([for uname])
AC_COMPILE_IFELSE(
  [AC_LANG_PROGRAM(
     [[#include <sys/utsname.h>
       #include <stdio.h>
      ]],
     [[
       struct utsname uts;
       uname(&uts);
       printf("running on %s %s %s for %s\n",
	      uts.sysname, uts.release, uts.version, uts.machine);
     ]])],
  [AC_MSG_RESULT(yes)
   AC_DEFINE([HAVE_UNAME], [1], [define if uname is available])
  ],
  [AC_MSG_RESULT(no)
   AC_MSG_WARN([uname is not correctly supported])
  ])
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#
# check for GCC noreturn attribute
#
AC_MSG_CHECKING(for GCC noreturn attribute)
AC_TRY_COMPILE([],[void foo() __attribute__((noreturn));],
	[AC_MSG_RESULT(yes)
		ISC_PLATFORM_NORETURN_PRE="#define ISC_PLATFORM_NORETURN_PRE"
		ISC_PLATFORM_NORETURN_POST="#define ISC_PLATFORM_NORETURN_POST __attribute__((noreturn))"],
	[AC_MSG_RESULT(no)
		ISC_PLATFORM_NORETURN_PRE="#define ISC_PLATFORM_NORETURN_PRE"
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		ISC_PLATFORM_NORETURN_POST="#define ISC_PLATFORM_NORETURN_POST"])
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AC_SUBST(ISC_PLATFORM_NORETURN_PRE)
AC_SUBST(ISC_PLATFORM_NORETURN_POST)

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#
# check if we have kqueue
#
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AC_ARG_ENABLE([kqueue],
	      [AS_HELP_STRING([--enable-kqueue],
			      [use BSD kqueue when available [default=yes]])],
	      [], enable_kqueue="yes")

AS_IF([test "$enable_kqueue" = "yes"],
      [AC_CHECK_FUNCS([kqueue])])
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#
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# check if we have epoll.  Linux kernel 2.4 has epoll_create() which fails,
# so we need to try running the code, not just test its existence.
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#
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AC_ARG_ENABLE([epoll],
	      [AS_HELP_STRING([--enable-epoll],
			      [use Linux epoll when available [default=auto]])],
	      [], [enable_epoll="yes"])

AS_IF([test "$enable_epoll" = "yes"],
      [AC_CHECK_FUNCS([epoll_create1])])
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#
# check if we support /dev/poll
#
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AC_ARG_ENABLE([devpoll],
	      [AS_HELP_STRING([--enable-devpoll],
			      [use /dev/poll when available [default=yes]])],
	      [], [enable_devpoll="yes"])
AS_IF([test "$enable_devpoll" = "yes"],
      [AC_CHECK_HEADERS([sys/devpoll.h devpoll.h])])
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#
# Find the machine's endian flavor.
#
AC_C_BIGENDIAN

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#
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# GeoIP support?
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#
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GEOIPLINKSRCS=
GEOIPLINKOBJS=
AC_ARG_WITH(geoip,
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	    AS_HELP_STRING([--with-geoip=PATH],
			   [Build with GeoIP support (yes|no|path)]),
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    use_geoip="$withval", use_geoip="no")
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if test "yes" = "$use_geoip"
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then
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	for d in /usr /usr/local /opt/local
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	do
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		if test -f $d/include/GeoIP.h
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		then
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			use_geoip=$d
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			break
		fi
	done
fi
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case "$use_geoip" in
	no|'')
		AC_MSG_CHECKING([for GeoIP support])
		AC_MSG_RESULT([disabled])
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		;;
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	*)
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		if test -d "$use_geoip" -o -L "$use_geoip"
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		then
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			CFLAGS="$CFLAGS -I$use_geoip/include"
			CPPFLAGS="$CPPFLAGS -I$use_geoip/include"
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			LIBS="$LIBS -L$use_geoip/lib"
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			case "$host_os" in
				netbsd*|openbsd*|solaris*)
					LIBS="$LIBS -Wl,-rpath=$use_geoip/lib"
					;;
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			esac
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		elif test "yes" = "$use_geoip"
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		then
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			AC_MSG_ERROR([GeoIP path not found])
		else
			AC_MSG_ERROR([GeoIP path $use_geoip does not exist])
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		fi
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		AC_CHECK_HEADER(GeoIP.h, [],
			[AC_MSG_ERROR([GeoIP header file not found])]
		)
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		AC_SEARCH_LIBS(GeoIP_id_by_addr_gl, GeoIP, [],
			[AC_MSG_ERROR([suitable GeoIP library not found])]
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		)
		AC_SEARCH_LIBS(fabsf, m, [],
			[AC_MSG_ERROR([Math library not found])]
		)
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		AC_DEFINE(HAVE_GEOIP, 1, Build with GeoIP support)
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		GEOIPLINKSRCS='${GEOIPLINKSRCS}'
		GEOIPLINKOBJS='${GEOIPLINKOBJS}'
		AC_MSG_CHECKING([for GeoIP support])
		AC_MSG_RESULT([yes])
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		AC_MSG_CHECKING([for GeoIP Country IPv6 support])
		AC_COMPILE_IFELSE(
			[AC_LANG_PROGRAM([
				#include <GeoIP.h>
				#include <netinet/in.h>
			], [
				struct in6_addr in6;
				GeoIP_country_name_by_ipnum_v6(NULL, in6);
			])],
			[
				AC_MSG_RESULT([yes])
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				AC_DEFINE(HAVE_GEOIP_V6, 1, Build with GeoIP Country IPv6 support)
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			],
			[AC_MSG_RESULT([no])]
		)
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		AC_MSG_CHECKING([for GeoIP City IPv6 support])
		AC_COMPILE_IFELSE(
			[AC_LANG_PROGRAM([
				#include <GeoIP.h>
				#include <GeoIPCity.h>
				#include <netinet/in.h>
			], [
				struct in6_addr in6;
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				int i = GEOIP_CITY_EDITION_REV0_V6;
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				GeoIP_record_by_ipnum_v6(NULL, in6);
			])],
			[
				AC_MSG_RESULT([yes])
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				AC_DEFINE(HAVE_GEOIP_CITY_V6, 1, Build with GeoIP City IPv6 support)
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			],
			[AC_MSG_RESULT([no])]
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		)
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		;;
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esac
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AC_SUBST(GEOIPLINKSRCS)
AC_SUBST(GEOIPLINKOBJS)
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#
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# Do we have arc4random(), etc ?
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#
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AC_CHECK_FUNCS(arc4random arc4random_buf arc4random_uniform getrandom)
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AX_PTHREAD
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LIBS="$PTHREAD_LIBS $LIBS"
CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
CC="$PTHREAD_CC"
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#
# We'd like to use sigwait() too
#
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AC_CHECK_FUNCS([sigwait pthread_attr_getstacksize pthread_attr_setstacksize])
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AC_ARG_WITH([locktype],
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	    AS_HELP_STRING([--with-locktype=ARG],
			   [Specify mutex lock type
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			    (adaptive or standard)]),
	    [], [with_locktype="adaptive"])

AS_CASE([$with_locktype],
	[adaptive],[
	  AC_MSG_CHECKING([for PTHREAD_MUTEX_ADAPTIVE_NP])
	  AC_COMPILE_IFELSE(
	    [AC_LANG_PROGRAM(
	       [[
		 #ifndef _GNU_SOURCE
		 #define _GNU_SOURCE
		 #endif
		 #include <pthread.h>
	       ]],
	       [[
		 return (PTHREAD_MUTEX_ADAPTIVE_NP);
	       ]]
	     )],
	    [AC_MSG_RESULT([using adaptive lock type])
	     AC_DEFINE([HAVE_PTHREAD_MUTEX_ADAPTIVE_NP], 1,
		       [Support for PTHREAD_MUTEX_ADAPTIVE_NP]) ],
	    [AC_MSG_RESULT([using standard lock type])]
	  )],
	[standard],[AC_MSG_RESULT([using standard lock type])],
	[AC_MSG_ERROR([You must specify "adaptive" or "standard" for --with-locktype.])]
       )

AC_CHECK_HEADERS([sched.h])

AC_SEARCH_LIBS([sched_yield],[rt])
AC_CHECK_FUNCS([sched_yield pthread_yield pthread_yield_np])
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AC_CHECK_HEADERS([sys/cpuset.h])
AC_CHECK_HEADERS([sys/procset.h])
AC_CHECK_FUNCS([pthread_setaffinity_np cpuset_setaffinity processor_bind sched_setaffinity])

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# Look for functions relating to thread naming
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AC_CHECK_FUNCS([pthread_setname_np pthread_set_name_np])
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AC_CHECK_HEADERS([pthread_np.h], [], [], [#include <pthread.h>])

#
# Look for sysconf to allow detection of the number of processors.
#
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AC_CHECK_FUNCS([sysconf])
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AC_SUBST(ALWAYS_DEFINES)
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AC_MSG_CHECKING(for libtool)
AC_ARG_WITH(libtool, AS_HELP_STRING([--with-libtool], [use GNU libtool]),
	    use_libtool="$withval", use_libtool="no")
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case $use_libtool in
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	yes)
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		AC_MSG_RESULT(yes)
		AM_PROG_LIBTOOL
		O=lo
		A=la
		LIBTOOL_MKDEP_SED='s;\.o;\.lo;'
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		LIBTOOL_MODE_COMPILE='--mode=compile'
		LIBTOOL_MODE_INSTALL='--mode=install'
		LIBTOOL_MODE_LINK='--mode=link'
		LIBTOOL_MODE_UNINSTALL='--mode=uninstall'
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		INSTALL_LIBRARY='${INSTALL_PROGRAM}'
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		;;
	*)
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		AC_MSG_RESULT(no)
		O=o
		A=a
		LIBTOOL=
		AC_SUBST(LIBTOOL)
		LIBTOOL_MKDEP_SED=
		LIBTOOL_MODE_COMPILE=
		LIBTOOL_MODE_INSTALL=
		LIBTOOL_MODE_LINK=
		LIBTOOL_MODE_UNINSTALL=
		INSTALL_LIBRARY='${INSTALL_DATA}'
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		;;
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esac
AC_SUBST(INSTALL_LIBRARY)
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#
# If PIC is disabled, shared libraries must also be
#
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AS_IF([test "$pic_mode" = "no"],
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      [enable_shared="no"])

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CRYPTO=OpenSSL
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#
# was --with-openssl specified?
#
AX_CHECK_OPENSSL([:],[AC_MSG_FAILURE([OpenSSL/LibreSSL not found])])

save_CFLAGS="$CFLAGS"
save_LIBS="$LIBS"
save_LDFLAGS="$LDFLAGS"
CFLAGS="$CFLAGS $OPENSSL_INCLUDES"
LIBS="$LIBS $OPENSSL_LIBS"
LDFLAGS="$LDFLAGS $OPENSSL_LDFLAGS"

AC_MSG_CHECKING([for OpenSSL >= 1.0.0 or LibreSSL])
AC_COMPILE_IFELSE(
    [AC_LANG_PROGRAM([[#include <openssl/opensslv.h>]],
		     [[#if !defined(LIBRESSL_VERSION_NUMBER) && (OPENSSL_VERSION_NUMBER < 0x1000000fL)
		       #error OpenSSL >= 1.0.0 or LibreSSL required
		       #endif
		      ]])],
    [AC_MSG_RESULT([yes])],
    [AC_MSG_FAILURE([not found])])

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#
# Check for functions added in OpenSSL or LibreSSL
#

AC_CHECK_FUNCS([CRYPTO_zalloc])
AC_CHECK_FUNCS([EVP_CIPHER_CTX_new EVP_CIPHER_CTX_free])
AC_CHECK_FUNCS([EVP_MD_CTX_new EVP_MD_CTX_free EVP_MD_CTX_reset])
AC_CHECK_FUNCS([HMAC_CTX_new HMAC_CTX_free HMAC_CTX_reset HMAC_CTX_get_md])

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#
# Check for algorithm support in OpenSSL
#

AC_CHECK_FUNCS([ECDSA_sign ECDSA_verify], [:],
	       [AC_MSG_FAILURE([ECDSA support in OpenSSL is mandatory.])])

AC_MSG_CHECKING([for ECDSA P-256 support])
AC_COMPILE_IFELSE(
    [AC_LANG_PROGRAM([[#include <openssl/evp.h>]],
		     [[EVP_PKEY_CTX *ctx = NID_X9_62_prime256v1;]])],
    [AC_MSG_RESULT([yes])],
    [AC_MSG_FAILURE([not found.  ECDSA P-256 support in OpenSSL is mandatory.])])

AC_MSG_CHECKING([for ECDSA P-384 support])
AC_COMPILE_IFELSE(
    [AC_LANG_PROGRAM([[#include <openssl/evp.h>]],
		     [[EVP_PKEY_CTX *ctx = NID_secp384r1;]])],
    [AC_MSG_RESULT([yes])],
    [AC_MSG_FAILURE([not found.  ECDSA P-384 support in OpenSSL is mandatory.])])

AC_MSG_CHECKING([for Ed25519 support])
AC_COMPILE_IFELSE(
    [AC_LANG_PROGRAM([[#include <openssl/evp.h>]],
		     [[EVP_PKEY_CTX *ctx = NID_ED25519;]])],
    [AC_DEFINE([HAVE_OPENSSL_ED25519], [1], [define if OpenSSL supports Ed25519])
     AC_MSG_RESULT([yes])],
    [AC_MSG_RESULT([no])])
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AC_MSG_CHECKING([for Ed448 support])
AC_MSG_RESULT([broken])
#AC_COMPILE_IFELSE(
#    [AC_LANG_PROGRAM([[#include <openssl/evp.h>]],
#		     [[EVP_PKEY_CTX *ctx = NID_ED448;]])],
#    [AC_DEFINE([HAVE_OPENSSL_ED448], [1], [define if OpenSSL supports Ed448])
#     AC_MSG_RESULT([yes])],
#    [AC_MSG_RESULT([no])])
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#
# Check for OpenSSL SHA-1 support
#
AC_CHECK_FUNCS([EVP_sha1], [:],
	       [AC_MSG_FAILURE([SHA-1 support in OpenSSL is mandatory.])])
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#
# Check for OpenSSL SHA-2 support
#
AC_CHECK_FUNCS([EVP_sha224 EVP_sha256 EVP_sha384 EVP_sha512], [:],
	       [AC_MSG_FAILURE([SHA-2 support in OpenSSL is mandatory.])])
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#
# Check for OpenSSL AES support
#
AC_CHECK_FUNCS([EVP_aes_128_ecb EVP_aes_192_ecb EVP_aes_256_ecb], [:],
	       [AC_MSG_FAILURE([AES support in OpenSSL is mandatory.])])
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#
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# Check for OpenSSL 1.1.x/LibreSSL functions
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#
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AC_CHECK_FUNCS([DH_get0_key ECDSA_SIG_get0 RSA_set0_key])
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#
# Check whether FIPS mode is available and whether we should enable it
#
AC_ARG_ENABLE([fips-mode],
	      [AS_HELP_STRING([--enable-fips-mode],
			      [enable FIPS mode in OpenSSL library [default=no]])],
	      [], [enable_fips_mode="no"])

AC_MSG_CHECKING([whether to enable FIPS mode in OpenSSL library])
AS_CASE([$enable_fips_mode],
	[yes], [AC_MSG_RESULT([yes])
		AC_CHECK_FUNCS([FIPS_mode],
			       [], [AC_MSG_FAILURE([OpenSSL FIPS mode requested but not available.])])],
	[no], [AC_MSG_RESULT([no])])

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CFLAGS="$save_CFLAGS"
LIBS="$save_LIBS"
LDFLAGS="$save_LDFLAGS"
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AC_SUBST([OPENSSL_INCLUDES])
AC_SUBST([OPENSSL_LIBS])
AC_SUBST([OPENSSL_LDFLAGS])
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#
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# Client Cookie algorithm choice
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#
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AC_ARG_WITH([cc-alg],
	    [AS_HELP_STRING([--with-cc-alg=ALG],
			   [choose the algorithm for Client Cookie
			    [aes|sha1|sha256] (default is aes)])],
	    [:], [with_cc_alg="aes"])

AC_MSG_CHECKING([for the algorithm for Client Cookie])
AS_CASE([$with_cc_alg],
	[sha1|SHA1],[AC_MSG_RESULT([sha1])
		     AC_DEFINE([HMAC_SHA1_CC], [1], [Use HMAC-SHA1 for Client Cookie generation])],
	[sha256|SHA256],[AC_MSG_RESULT([sha256])
			 AC_DEFINE([HMAC_SHA256_CC], [1], [Use HMAC-SHA256 for Client Cookie generation])],
	[aes|AES|auto],[AC_MSG_RESULT([aes])
		       AC_DEFINE([AES_CC], [1], [Use AES for Client Cookie generation])],
	[AC_MSG_ERROR([Invalid $with_cc_alg algorithm for Client Cookie])])
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PKCS11_TOOLS=
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PKCS11_TEST=
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#
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# was --enable-native-pkcs11 specified?
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#
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AC_ARG_ENABLE(native-pkcs11,
	      AS_HELP_STRING([--enable-native-pkcs11],
			     [use native PKCS11 for public-key crypto [default=no]]),
	      [:], [enable_native_pkcs11="no"])

AC_MSG_CHECKING([for PKCS11 for Public-Key Cryptography])
AS_CASE([$enable_native_pkcs11],
	[no],[AC_MSG_RESULT([no])],
	[yes],[PKCS11_TOOLS=pkcs11
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	       PKCS11_TEST=pkcs11
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	       CRYPTO=pkcs11
	       AS_IF([$use_threads],
		     [:],
		     [AC_MSG_ERROR([PKCS11 requires threading support])])
	       AC_MSG_RESULT([yes])
	       AC_CHECK_FUNCS([getpassphrase])
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	      ])
AC_SUBST([PKCS11_TEST])
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AC_SUBST([PKCS11_TOOLS])

AS_CASE([$CRYPTO],
	[pkcs11],[AC_DEFINE([USE_PKCS11], [1], [define if PKCS11 is used for Public-Key Cryptography])],
	[AC_DEFINE([USE_OPENSSL], [1], [define if OpenSSL is used for Public-Key Cryptography])])

# preparation for automake
# AM_CONDITIONAL([PKCS11_TOOLS], [test "$with_native_pkcs11" = "yes"])
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#
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# was --with-pkcs11 specified?
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#
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AC_ARG_WITH([pkcs11],
	    [AS_HELP_STRING([--with-pkcs11[=PATH]],
			    [Build with PKCS11 support [no|path] (PATH is for the PKCS11 provider)])],
	    [:], [with_pkcs11="undefined"])
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AS_CASE([$with_pkcs11],
	[yes|auto],[AC_MSG_ERROR([--with-pkcs11 needs explicit path to the PKCS11 library])],
	[no|undefined],[with_pkcs11="undefined"])
AC_DEFINE_UNQUOTED([PK11_LIB_LOCATION], ["$with_pkcs11"], [define the default PKCS11 library path])

# for PKCS11 benchmarks

have_clock_gt=no
AC_CHECK_FUNC(clock_gettime,have_clock_gt=yes,)
if test "no" = "$have_clock_gt"; then
	AC_CHECK_LIB(rt,clock_gettime,have_clock_gt=rt,)
fi

if test "no" != "$have_clock_gt"; then
	AC_DEFINE(HAVE_CLOCK_GETTIME, 1, [Define if clock_gettime is available.])
fi

if test "rt" = "$have_clock_gt"; then
	LIBS="-lrt $LIBS"
fi

AC_MSG_CHECKING(for GSSAPI library)
AC_ARG_WITH(gssapi,
	    AS_HELP_STRING([--with-gssapi=[PATH|[/path/]krb5-config]],
			   [Specify path for system-supplied GSSAPI
				[default=yes]]),
	    use_gssapi="$withval", use_gssapi="yes")

# first try using krb5-config, if that does not work then fall back to "yes" method.

case "$use_gssapi" in
*/krb5-config|krb5-config)
    AC_MSG_RESULT(trying $use_gssapi)
    if test krb5-config = "$use_gssapi"
    then
	AC_PATH_PROG(KRB5_CONFIG, $use_gssapi)
    else
	KRB5_CONFIG="$use_gssapi"
    fi
    gssapi_cflags=`$KRB5_CONFIG --cflags gssapi`
    gssapi_libs=`$KRB5_CONFIG --libs gssapi`
    saved_cppflags="$CPPFLAGS"
    CPPFLAGS="$gssapi_cflags $CPPFLAGS"
    AC_CHECK_HEADERS(gssapi.h gssapi/gssapi.h,
	[ISC_PLATFORM_GSSAPIHEADER="#define ISC_PLATFORM_GSSAPIHEADER <$ac_header>"])
    if test "" = "$ISC_PLATFORM_GSSAPIHEADER"; then
	AC_MSG_RESULT([krb5-config: gssapi.h not found])
	CPPFLAGS="$saved_cppflags"
	use_gssapi="yes"
    else
	AC_CHECK_HEADERS(krb5/krb5.h krb5.h,
	    [ISC_PLATFORM_KRB5HEADER="#define ISC_PLATFORM_KRB5HEADER <$ac_header>"])
	if test "" = "$ISC_PLATFORM_KRB5HEADER"; then
	    AC_MSG_RESULT([krb5-config: krb5.h not found])
	    CPPFLAGS="$saved_cppflags"
	    use_gssapi="yes"
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	else
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	    CPPFLAGS="$saved_cppflags"
	    saved_libs="$LIBS"
	    LIBS=$gssapi_libs
	    AC_MSG_CHECKING([krb5-config linking as $LIBS])
	    AC_TRY_LINK( , [gss_acquire_cred();krb5_init_context()],
		gssapi_linked=yes, gssapi_linked=no)
	    case $gssapi_linked in
		yes) AC_MSG_RESULT([krb5-config: linked]);;
		no)  AC_MSG_RESULT([krb5-config: could not determine proper GSSAPI linkage])
		    use_gssapi="yes"
		    ;;
	    esac
	    LIBS=$saved_libs
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	fi
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    fi
    if test "yes" = "$use_gssapi"; then
	AC_MSG_CHECKING([for GSSAPI library, non krb5-config method])
    fi
    ;;
esac

case "$host" in
*darwin*)
	if test "yes" = "$use_gssapi"
	then
		use_gssapi=framework
	fi
	;;
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esac
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# gssapi is just the framework, we really require kerberos v5, so
# look for those headers (the gssapi headers must be there, too)
# The problem with this implementation is that it doesn't allow
# for the specification of gssapi and krb5 headers in different locations,
# which probably ought to be fixed although fixing might raise the issue of
# trying to build with incompatible versions of gssapi and krb5.
if test "yes" = "$use_gssapi"
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then
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	# first, deal with the obvious
	if test \( -f /usr/include/kerberosv5/krb5.h -o \
		   -f /usr/include/krb5/krb5.h -o \
		   -f /usr/include/krb5.h \)   -a \
		\( -f /usr/include/gssapi.h -o \
		   -f /usr/include/gssapi/gssapi.h \)
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	then
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		use_gssapi=/usr
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	else
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	    krb5dirs="/usr/local /usr/local/krb5 /usr/local/kerberosv5 /usr/local/kerberos /usr/pkg /usr/krb5 /usr/kerberosv5 /usr/kerberos /usr"
	    for d in $krb5dirs
	    do
		if test -f $d/include/gssapi/gssapi_krb5.h -o \
			-f $d/include/krb5.h
		then
			if test -f $d/include/gssapi/gssapi.h -o \
				-f $d/include/gssapi.h
			then
				use_gssapi=$d
				break
			fi
		fi
		use_gssapi="no"
	    done
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	fi
fi
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case "$use_gssapi" in
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	no)
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		AC_MSG_RESULT(disabled)
		USE_GSSAPI=''
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		;;
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	yes)
		AC_MSG_ERROR([--with-gssapi must specify a path])
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		;;
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	*/krb5-config|krb5-config)
		USE_GSSAPI='-DGSSAPI'
		DST_GSSAPI_INC="$gssapi_cflags"
		DNS_GSSAPI_LIBS="$gssapi_libs"
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		;;
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	framework)
		USE_GSSAPI='-DGSSAPI'
		ISC_PLATFORM_GSSAPIHEADER="#define ISC_PLATFORM_GSSAPIHEADER <Kerberos/Kerberos.h>"
		ISC_PLATFORM_KRB5HEADER="#define ISC_PLATFORM_KRB5HEADER <Kerberos/Kerberos.h>"
		DNS_GSSAPI_LIBS="-framework Kerberos"
		AC_MSG_RESULT(framework)
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		;;
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	*)
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		AC_MSG_RESULT(looking in $use_gssapi/lib)
		USE_GSSAPI='-DGSSAPI'
		saved_cppflags="$CPPFLAGS"
		CPPFLAGS="-I$use_gssapi/include $CPPFLAGS"
		AC_CHECK_HEADERS(gssapi.h gssapi/gssapi.h,
		    [ISC_PLATFORM_GSSAPIHEADER="#define ISC_PLATFORM_GSSAPIHEADER <$ac_header>"
		     gssapi_hack="#include <$ac_header>"])
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		if test "" = "$ISC_PLATFORM_GSSAPIHEADER"; then
		    AC_MSG_ERROR([gssapi.h not found])
		fi
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		AC_CHECK_HEADERS(gssapi_krb5.h gssapi/gssapi_krb5.h,
		    [ISC_PLATFORM_GSSAPI_KRB5_HEADER="#define ISC_PLATFORM_GSSAPI_KRB5_HEADER <$ac_header>"
		     gssapi_krb5_hack="#include <$ac_header>"])
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		AC_CHECK_HEADERS(krb5.h krb5/krb5.h kerberosv5/krb5.h,
		    [ISC_PLATFORM_KRB5HEADER="#define ISC_PLATFORM_KRB5HEADER <$ac_header>"
		    krb5_hack="#include <$ac_header>"])

		if test "" = "$ISC_PLATFORM_KRB5HEADER"; then
		    AC_MSG_ERROR([krb5.h not found])
		fi

		#
		# XXXDCL This probably doesn't work right on all systems.
		# It will need to be worked on as problems become evident.
		#
		# Essentially the problems here relate to two different
		# areas.  The first area is building with either KTH
		# or MIT Kerberos, particularly when both are present on
		# the machine.  The other is static versus dynamic linking.
		#
		# On the KTH vs MIT issue, Both have libkrb5 that can mess
		# up the works if one implementation ends up trying to
		# use the other's krb.  This is unfortunately a situation
		# that very easily arises.
		#
		# Dynamic linking when the dependency information is built
		# into MIT's libgssapi_krb5 or KTH's libgssapi magically makes
		# all such problems go away, but when that setup is not
		# present, because either the dynamic libraries lack
		# dependencies or static linking is being done, then the
		# problems start to show up.
		saved_libs="$LIBS"
		for TRY_LIBS in \
		    "-lgssapi_krb5" \
		    "-lgssapi_krb5 -lkrb5 -lk5crypto -lcom_err" \
		    "-lgssapi_krb5 -lkrb5 -lk5crypto -lcom_err -lresolv" \
		    "-lgssapi" \
		    "-lgssapi -lkrb5 -ldes -lcrypt -lasn1 -lroken -lcom_err" \
		    "-lgssapi -lkrb5 -lcrypt -lasn1 -lroken -lcom_err" \
		    "-lgssapi -lkrb5 -lgssapi_krb5 -lcrypt -lasn1 -lroken -lcom_err" \
		    "-lgssapi -lkrb5 -lhx509 -lcrypt -lasn1 -lroken -lcom_err" \
		    "-lgss -lkrb5"
		do
		    # Note that this does not include $saved_libs, because
		    # on FreeBSD machines this configure script has added
		    # -L/usr/local/lib to LIBS, which can make the
		    # -lgssapi_krb5 test succeed with shared libraries even
		    # when you are trying to build with KTH in /usr/lib.
		    if test "/usr" = "$use_gssapi"
		    then
			    LIBS="$TRY_LIBS $ISC_OPENSSL_LIBS"
		    else
			    LIBS="-L$use_gssapi/lib $TRY_LIBS $ISC_OPENSSL_LIBS"
		    fi
		    AC_MSG_CHECKING(linking as $TRY_LIBS)
		    AC_TRY_LINK([
#include <sys/types.h>
$gssapi_hack
$gssapi_krb5_hack
$krb5_hack
				] , [gss_acquire_cred(NULL, NULL, 0, NULL, 0, NULL, NULL, NULL);krb5_init_context(NULL);
#if defined(HAVE_GSSAPI_KRB5_H) || defined(HAVE_GSSAPI_GSSAPI_KRB5_H)
gsskrb5_register_acceptor_identity(NULL);
#endif],
				gssapi_linked=yes, gssapi_linked=no)
		    case $gssapi_linked in
		    yes) AC_MSG_RESULT(yes); break ;;
		    no)  AC_MSG_RESULT(no) ;;
		    esac
		done

		CPPFLAGS="$saved_cppflags"

		case $gssapi_linked in
		no) AC_MSG_ERROR(could not determine proper GSSAPI linkage) ;;
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		esac
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		#
		# XXXDCL Major kludge.  Tries to cope with KTH in /usr/lib
		# but MIT in /usr/local/lib and trying to build with KTH.
		# /usr/local/lib can end up earlier on the link lines.
		# Like most kludges, this one is not only inelegant it
		# is also likely to be the wrong thing to do at least as
		# many times as it is the right thing.  Something better
		# needs to be done.
		#
		if test "/usr" = "$use_gssapi" -a \
			-f /usr/local/lib/libkrb5.a; then
		    FIX_KTH_VS_MIT=yes
		fi

		case "$FIX_KTH_VS_MIT" in
		yes)
		    case "$enable_static_linking" in
		    yes) gssapi_lib_suffix=".a"  ;;
		    *)   gssapi_lib_suffix=".so" ;;
		    esac

		    for lib in $LIBS; do
			case $lib in
			-L*)
			    ;;
			-l*)
			    new_lib=`echo $lib |
				     sed -e s%^-l%$use_gssapi/lib/lib% \
					 -e s%$%$gssapi_lib_suffix%`
			    NEW_LIBS="$NEW_LIBS $new_lib"
			    ;;
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			*)
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			   AC_MSG_ERROR([KTH vs MIT Kerberos confusion!])
			    ;;
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			esac
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		    done
		    LIBS="$NEW_LIBS"
		    ;;
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		esac
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		DST_GSSAPI_INC="-I$use_gssapi/include"
		DNS_GSSAPI_LIBS="$LIBS"

		AC_MSG_RESULT(using GSSAPI from $use_gssapi/lib and $use_gssapi/include)
		LIBS="$saved_libs"
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		;;
esac
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AC_SUBST(ISC_PLATFORM_HAVEGSSAPI)
AC_SUBST(ISC_PLATFORM_GSSAPIHEADER)
AC_SUBST(ISC_PLATFORM_GSSAPI_KRB5_HEADER)
AC_SUBST(ISC_PLATFORM_KRB5HEADER)
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AC_SUBST(USE_GSSAPI)
AC_SUBST(DST_GSSAPI_INC)
AC_SUBST(DNS_GSSAPI_LIBS)
DNS_CRYPTO_LIBS="$DNS_GSSAPI_LIBS"
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#
# Applications linking with libdns also need to link with these libraries.
#
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AC_SUBST(DNS_CRYPTO_LIBS)
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#
# was --with-lmdb specified?
#
AC_MSG_CHECKING(for lmdb library)
AC_ARG_WITH(lmdb,
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	    AS_HELP_STRING([--with-lmdb[=PATH]],
			   [build with LMDB library [yes|no|path]]),
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    use_lmdb="$withval", use_lmdb="auto")

have_lmdb=""
case "$use_lmdb" in
	no)
		lmdb_libs=""
		;;
	auto|yes)
		for d in /usr /usr/local /opt/local
		do
			if test -f "${d}/include/lmdb.h"
			then
				if test ${d} != /usr
				then
					lmdb_cflags="-I ${d}/include"
					LIBS="$LIBS -L${d}/lib"
				fi
				have_lmdb="yes"
			fi
		done
		;;
	*)
		if test -f "${use_lmdb}/include/lmdb.h"
		then
			lmdb_cflags="-I${use_lmdb}/include"
			LIBS="$LIBS -L${use_lmdb}/lib"
			have_lmdb="yes"
		else
			AC_MSG_ERROR([$use_lmdb/include/lmdb.h not found.])
		fi
		;;
esac

if test "X${have_lmdb}" != "X"
then
	AC_MSG_RESULT(yes)
	AC_SEARCH_LIBS([mdb_env_create], [lmdb], [],
		       [AC_MSG_ERROR([found lmdb include but not library.])
			have_lmdb=""])
elif test "X$use_lmdb" = Xyes
then
	AC_MSG_ERROR([include/lmdb.h not found.])
else
	AC_MSG_RESULT(no)
fi

NZD_TOOLS=""
NZDSRCS=
NZDTARGETS=
if test "X${have_lmdb}" != "X"
then
	CFLAGS="$CFLAGS $lmdb_cflags"
	AC_DEFINE(HAVE_LMDB, 1, [Define if lmdb was found])
	NZD_TOOLS="nzd"
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	NZDSRCS='${NZDSRCS}'
	NZDTARGETS='${NZDTARGETS}'
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fi
AC_SUBST(NZD_TOOLS)
AC_SUBST(NZDSRCS)
AC_SUBST(NZDTARGETS)

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#
# was --with-libxml2 specified?
#
AC_MSG_CHECKING(for libxml2 library)
AC_ARG_WITH(libxml2,
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	    AS_HELP_STRING([--with-libxml2[=PATH]],
			   [build with libxml2 library [yes|no|path]]),
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    use_libxml2="$withval", use_libxml2="auto")

case "$use_libxml2" in
	no)
		DST_LIBXML2_INC=""
		;;
	auto|yes)
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		case X`(xml2-config --version) 2>/dev/null` in
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		X2.[[6789]].*)
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			libxml2_libs=`xml2-config --libs`
			libxml2_cflags=`xml2-config --cflags`
			;;
		*)
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			if test "yes" = "$use_libxml2" ; then
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				AC_MSG_RESULT(no)
				AC_MSG_ERROR(required libxml2 version not available)
			else
				libxml2_libs=
				libxml2_cflags=
			fi
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			;;
		esac
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		;;
	*)
		if test -f "$use_libxml2/bin/xml2-config" ; then
			libxml2_libs=`$use_libxml2/bin/xml2-config --libs`
			libxml2_cflags=`$use_libxml2/bin/xml2-config --cflags`
		fi
		;;
esac

if test "X$libxml2_libs" != "X"
then
	CFLAGS="$CFLAGS $libxml2_cflags"
	LIBS="$LIBS $libxml2_libs"
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	#
	# Sanity check xml2-config output.
	#
	AC_TRY_LINK([#include <libxml/xmlwriter.h>],
		    [return(xmlTextWriterStartElement(NULL, NULL));],
		    AC_MSG_RESULT(yes),
		    AC_MSG_ERROR(xml2-config returns badness))
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	AC_DEFINE(HAVE_LIBXML2, 1, [Define if libxml2 was found])
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	XMLSTATS=1
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else
	AC_MSG_RESULT(no)
fi