dnl Process this file with autoconf to produce a configure script.
dnl 
dnl $Id: configure.in,v 1.58 2002/04/04 20:49:20 swa Exp $
dnl 
dnl Written by and Copyright (C) 2001, 2002 the SourceForge
dnl Privoxy team. http://www.privoxy.org/
dnl
dnl Based on the Internet Junkbuster originally written
dnl by and Copyright (C) 1997 Anonymous Coders and 
dnl Junkbusters Corporation.  http://www.junkbusters.com
dnl
dnl This program is free software; you can redistribute it 
dnl and/or modify it under the terms of the GNU General
dnl Public License as published by the Free Software
dnl Foundation; either version 2 of the License, or (at
dnl your option) any later version.
dnl 
dnl This program is distributed in the hope that it will
dnl be useful, but WITHOUT ANY WARRANTY; without even the
dnl implied warranty of MERCHANTABILITY or FITNESS FOR A
dnl PARTICULAR PURPOSE.  See the GNU General Public
dnl License for more details.
dnl 
dnl The GNU General Public License should be included with
dnl this file.  If not, you can view it at
dnl http://www.gnu.org/copyleft/gpl.html
dnl or write to the Free Software Foundation, Inc., 59
dnl Temple Place - Suite 330, Boston, MA  02111-1307, USA.
dnl 
dnl $Log: configure.in,v $
dnl Revision 1.58  2002/04/04 20:49:20  swa
dnl attempt to consolidate the
dnl different dokbook versions.
dnl
dnl Revision 1.57  2002/04/04 00:36:36  gliptak
dnl always use pcre for matching
dnl
dnl Revision 1.56  2002/04/03 22:28:03  gliptak
dnl Removed references to gnu_regex
dnl
dnl Revision 1.55  2002/04/03 03:54:38  gliptak
dnl Checking pcre version
dnl
dnl Revision 1.54  2002/04/01 00:54:24  gliptak
dnl More changes needed around regex support.
dnl
dnl Revision 1.53  2002/03/29 20:09:01  swa
dnl al's patch
dnl
dnl Revision 1.52  2002/03/29 19:51:40  gliptak
dnl Correcting compile problem with Debian
dnl
dnl Revision 1.51  2002/03/28 20:43:00  swa
dnl set make correctly
dnl
dnl Revision 1.50  2002/03/27 03:03:45  hal9
dnl Add test for man2html
dnl
dnl Revision 1.49  2002/03/27 02:19:52  david__schmidt
dnl More Mac OSX support:
dnl - Get rid of extraneous, noisy -pthread warnings
dnl - Define unix so we get oes' unix-tagged changes
dnl
dnl Revision 1.48  2002/03/26 22:29:54  swa
dnl we have a new homepage!
dnl
dnl Revision 1.47  2002/03/26 16:41:00  hal9
dnl Upped RPM Release to 3 (need to build new RH packages)
dnl
dnl Revision 1.46  2002/03/24 18:55:06  jongfoster
dnl Making Docbook work under Windows
dnl
dnl Revision 1.45  2002/03/24 14:19:55  swa
dnl set rpm package release in configure.in. nowhere else.
dnl
dnl Revision 1.44  2002/03/24 13:25:43  swa
dnl name change related issues
dnl
dnl Revision 1.43  2002/03/24 12:56:21  swa
dnl name change related issues.
dnl
dnl Revision 1.42  2002/03/22 18:11:37  jongfoster
dnl Bumping version number to 2.9.12
dnl
dnl Revision 1.41  2002/03/19 19:30:04  morcego
dnl - Fixing stylesheet checking on configure. If it is found, no further checks
dnl   should be done
dnl
dnl - configure will now check for db2html or docbook2html (should work now
dnl   on SuSe without the docbktls package)
dnl
dnl Revision 1.40  2002/03/09 14:33:30  oes
dnl Fixing the (harmless) AC_CHECK_FILE warnings
dnl
dnl Revision 1.39  2002/03/08 16:46:13  oes
dnl Added --enable-no-gifs
dnl
dnl Revision 1.38  2002/03/08 14:13:50  morcego
dnl Fixing configure, to remove a command not found error.
dnl
dnl Revision 1.37  2002/03/08 12:58:21  oes
dnl Tiny bugfix in AC_ARG_WITH(debug)
dnl
dnl Revision 1.36  2002/03/06 23:50:36  morcego
dnl Will not test for a text browser if we are not using docbook.
dnl
dnl Revision 1.35  2002/03/06 21:55:52  morcego
dnl New configure option: --with-docbook=(yes|no|directory)
dnl Preliminary new platform detection code included. Will work with the
dnl old one for now. No use just trowing it away
dnl
dnl Revision 1.34  2002/03/06 20:57:00  morcego
dnl Fixing detection of stylesheets on SuSe.
dnl
dnl Revision 1.33  2002/03/05 17:31:11  morcego
dnl Search for docbook.dsl. Should solve portability problems for SuSe.
dnl
dnl Revision 1.32  2002/03/05 14:07:43  morcego
dnl configure now detects rpm topdir, and change GNUmakefile acordingly
dnl    (based on sugestion by Sarantis Paskalis)
dnl
dnl Revision 1.31  2002/03/05 13:43:28  morcego
dnl Checking for text browser, so redhat-dok can work.
dnl
dnl Revision 1.30  2002/03/04 17:58:01  oes
dnl Deleted _DEBUG and PID_FILE_PATH
dnl
dnl Revision 1.29  2002/02/28 14:20:53  oes
dnl Fixed detection of gethost*_r functions on Solaris
dnl
dnl Revision 1.28  2002/02/27 15:02:38  oes
dnl Incremented version number
dnl
dnl Revision 1.27  2002/01/10 12:35:18  oes
dnl Added cross-compile defaults to the AC_CHECK_SIZEOF macros
dnl to silence autoconf warnings. Numbers are for Intel/Linux.
dnl Is there a better way?
dnl
dnl Revision 1.26  2002/01/09 14:29:49  oes
dnl - Added AC_CHECK_FUNC tests for the availability of
dnl   gethostbyname_r, gethostbyaddr_r, gmtime_r and
dnl   localtime_r, as well as AC_TRY_COMPILE tests to
dnl   determine their signatures.
dnl
dnl - Fixed a bug with the init of CFLAGS that was
dnl   reported by barsnick
dnl
dnl Revision 1.25  2002/01/04 15:27:18  oes
dnl Changed quoting of CODE_STATUS for use in make
dnl
dnl Revision 1.24  2001/12/30 14:07:31  steudten
dnl - Add signal handling (unix)
dnl - Add SIGHUP handler (unix)
dnl - Add creation of pidfile (unix)
dnl - Add action 'top' in rc file (RH)
dnl - Add entry 'SIGNALS' to manpage
dnl - Add exit message to logfile (unix)
dnl
dnl Revision 1.23  2001/12/09 20:24:42  david__schmidt
dnl Change from "alpha" to "beta" in configure.in
dnl
dnl Revision 1.22  2001/12/01 11:24:01  jongfoster
dnl Renaming Makefile.in to GNUmakefile.in so that non-GNU versions of
dnl make break in a more obvious way.
dnl
dnl Revision 1.21  2001/11/30 21:35:54  jongfoster
dnl Bumping version number to 2.9.10
dnl
dnl Revision 1.20  2001/10/23 21:24:09  jongfoster
dnl Support for FEATURE_CGI_EDIT_ACTIONS
dnl
dnl Revision 1.19  2001/10/07 15:33:14  oes
dnl Removed FEATURE_DENY_GZIP
dnl Bumped up version number
dnl
dnl Revision 1.18  2001/09/13 13:10:24  steudten
dnl
dnl PreWork for Debug Interface.
dnl Add new option "--with-debug" to enable debugging (flags aso.)
dnl
dnl Revision 1.17  2001/09/12 23:44:55  david__schmidt
dnl Mac OSX (Darwin) support added.
dnl
dnl Revision 1.16  2001/09/12 22:55:45  joergs
dnl AmigaOS support added.
dnl
dnl Revision 1.15  2001/09/12 17:28:59  david__schmidt
dnl
dnl OS/2 port: update autoconf'd support for the platform.
dnl
dnl Revision 1.14  2001/07/30 22:12:11  jongfoster
dnl Fixing Solaris build (I hope) and tidying up #defines:
dnl - All feature #defines are now of the form FEATURE_xxx
dnl - Permanently turned off WIN_GUI_EDIT
dnl - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
dnl
dnl Revision 1.13  2001/07/29 17:09:17  jongfoster
dnl Major changes to build system in order to fix these bugs:
dnl - pthreads under Linux was broken - changed -lpthread to -pthread
dnl - Compiling in MinGW32 mode under CygWin now correctly detects
dnl   which shared libraries are available
dnl - Solaris support (?) (Not tested under Solaris yet)
dnl
dnl Revision 1.12  2001/07/25 19:16:27  oes
dnl Bumping version number to 2.9.8
dnl
dnl Revision 1.11  2001/07/21 18:00:07  jongfoster
dnl Bumping version number to 2.9.7
dnl
dnl Revision 1.10  2001/07/18 17:25:04  oes
dnl Fixed a typo
dnl
dnl Revision 1.9  2001/07/15 19:45:13  jongfoster
dnl Added support for linking with POSIX threads library
dnl
dnl Revision 1.8  2001/07/15 17:54:29  jongfoster
dnl Renaming #define STATIC to STATIC_PCRE
dnl Adding new #define FEATURE_PTHREAD that will be used to enable
dnl POSIX threads support.
dnl
dnl Revision 1.7  2001/07/13 13:58:05  oes
dnl    Completely reorganized the selection scheme for
dnl    pcre, pcreposix, pcrs and gnu_regex:
dnl
dnl    The presence of shared pcre, pcreposix or pcrs
dnl    libraried is now autodetected. Additionally, the
dnl    user can enforce using the built-in static variants
dnl    by specifying --disable-dynamic-(pcre|pcrs).
dnl    Care is taken to avoid that pcre is dyn, while pcreposix
dnl    is static, if both are used and that pcrs is static if
dnl    pcrs is.
dnl
dnl    The choice between pcre, gnu or no regex for actionsfile
dnl    URL matching is now via
dnl    --(enable|disable)-regex-matching[=(gnu|pcre|no)] with the
dnl    default being pcre.
dnl
dnl Revision 1.6  2001/06/29 21:56:40  oes
dnl Version -> 2.9.5
dnl
dnl Revision 1.5  2001/06/29 13:26:27  oes
dnl Introduced #define CODE_STATUS
dnl
dnl Revision 1.4  2001/05/29 09:50:24  jongfoster
dnl Unified blocklist/imagelist/permissionslist.
dnl File format is still under discussion, but the internal changes
dnl are (mostly) done.
dnl
dnl Also modified interceptor behaviour:
dnl - We now intercept all URLs beginning with one of the following
dnl   prefixes (and *only* these prefixes):
dnl     * http://i.j.b/
dnl     * http://ijbswa.sf.net/config/
dnl     * http://ijbswa.sourceforge.net/config/
dnl - New interceptors "home page" - go to http://i.j.b/ to see it.
dnl - Internal changes so that intercepted and fast redirect pages
dnl   are not replaced with an image.
dnl - Interceptors now have the option to send a binary page direct
dnl   to the client. (i.e. ijb-send-banner uses this)
dnl - Implemented show-url-info interceptor.  (Which is why I needed
dnl   the above interceptors changes - a typical URL is
dnl   "http://i.j.b/show-url-info?url=www.somesite.com/banner.gif".
dnl   The previous mechanism would not have intercepted that, and
dnl   if it had been intercepted then it then it would have replaced
dnl   it with an image.)
dnl
dnl Revision 1.3  2001/05/22 18:46:04  oes
dnl
dnl - Enabled filtering banners by size rather than URL
dnl   by adding patterns that replace all standard banner
dnl   sizes with the "Junkbuster" gif to the re_filterfile
dnl
dnl - Enabled filtering WebBugs by providing a pattern
dnl   which kills all 1x1 images
dnl
dnl - Added support for PCRE_UNGREEDY behaviour to pcrs,
dnl   which is selected by the (nonstandard and therefore
dnl   capital) letter 'U' in the option string.
dnl   It causes the quantifiers to be ungreedy by default.
dnl   Appending a ? turns back to greedy (!).
dnl
dnl - Added a new interceptor ijb-send-banner, which
dnl   sends back the "Junkbuster" gif. Without imagelist or
dnl   MSIE detection support, or if tinygif = 1, or the
dnl   URL isn't recognized as an imageurl, a lame HTML
dnl   explanation is sent instead.
dnl
dnl - Added new feature, which permits blocking remote
dnl   script redirects and firing back a local redirect
dnl   to the browser.
dnl   The feature is conditionally compiled, i.e. it
dnl   can be disabled with --disable-fast-redirects,
dnl   plus it must be activated by a "fast-redirects"
dnl   line in the config file, has its own log level
dnl   and of course wants to be displayed by show-proxy-args
dnl   Note: Boy, all the #ifdefs in 1001 locations and
dnl   all the fumbling with configure.in and acconfig.h
dnl   were *way* more work than the feature itself :-(
dnl
dnl - Because a generic redirect template was needed for
dnl   this, tinygif = 3 now uses the same.
dnl
dnl - Moved GIFs, and other static HTTP response templates
dnl   to project.h
dnl
dnl - Some minor fixes
dnl
dnl - Removed some >400 CRs again (Jon, you really worked
dnl   a lot! ;-)
dnl
dnl Revision 1.2  2001/05/20 01:21:20  jongfoster
dnl Version 2.9.4 checkin.
dnl - Merged popupfile and cookiefile, and added control over PCRS
dnl   filtering, in new "permissionsfile".
dnl - Implemented LOG_LEVEL_FATAL, so that if there is a configuration
dnl   file error you now get a message box (in the Win32 GUI) rather
dnl   than the program exiting with no explanation.
dnl - Made killpopup use the PCRS MIME-type checking and HTTP-header
dnl   skipping.
dnl - Removed tabs from "config"
dnl - Moved duplicated url parsing code in "loaders.c" to a new funcition.
dnl - Bumped up version number.
dnl
dnl Revision 1.1.1.1  2001/05/15 13:58:50  oes
dnl Initial import of version 2.9.3 source tree
dnl
dnl 


dnl =================================================================
dnl AutoConf Initialization
dnl =================================================================

AC_REVISION($Revision: 1.58 $)
AC_INIT(jcc.c)
AC_CONFIG_HEADER([config.h])
AC_CANONICAL_HOST

dodk=auto
DKPREFIX=none
AC_ARG_WITH(docbook, dnl
  --with-docbook=[[yes|no|directory]]	
                           Enable docbook documentation creation 
			   (default = yes, for gnu and linux),[dnl
case "$with_docbook" in
yes) dodk=yes;;
no) dodk=no;;
*) 
	dodk=no
	DKPREFIX=$withval
	;;
esac
])
DB2HTML=false
AC_ARG_WITH(db2html, dnl
  --with-db2html=<path/executable>
                          Set the location of the docbook to html converter
                          (default = search),[dnl
DB2HTML=$withval
])

dnl =================================================================
dnl Application version number
dnl =================================================================

VERSION_MAJOR=2
VERSION_MINOR=9
VERSION_POINT=13
VERSION_RPM_PACKAGE=3
CODE_STATUS="beta"

dnl CODE_STATUS can be "alpha", "beta", or "stable", and will be
dnl used for CGI output

dnl =================================================================
dnl Substitute the version numbers
dnl =================================================================

AC_SUBST(VERSION_MAJOR)
AC_SUBST(VERSION_MINOR)
AC_SUBST(VERSION_POINT)
AC_SUBST(VERSION_RPM_PACKAGE)
AC_SUBST(CODE_STATUS)

dnl
AC_DEFINE_UNQUOTED(VERSION_MAJOR,${VERSION_MAJOR})
AC_DEFINE_UNQUOTED(VERSION_MINOR,${VERSION_MINOR})
AC_DEFINE_UNQUOTED(VERSION_POINT,${VERSION_POINT})
AC_DEFINE_UNQUOTED(VERSION_RPM_PACKAGE,${VERSION_RPM_PACKAGE})
AC_DEFINE_UNQUOTED(VERSION,"${VERSION_MAJOR}.${VERSION_MINOR}.${VERSION_POINT}")
AC_DEFINE_UNQUOTED(CODE_STATUS,"${CODE_STATUS}")

dnl =================================================================
dnl Checks for programs needed to build.
dnl =================================================================
AC_PROG_CC
AC_PROG_CPP
AC_PROG_INSTALL
AC_PROG_LN_S
AC_PROG_MAKE_SET

AC_CHECK_PROG(GDB,gdb,yes,no)

dnl =================================================================
dnl debug, gcc and gdb support 
dnl =================================================================

AC_ARG_WITH(debug,
        [  --with-debug            Enable debug mode],
        [
                if test "x$withval" != "xno" ; then
		    if test $ac_cv_prog_cc_g = yes; then
		      if test "$GCC" = yes; then
			if test "$GDB"; then
			  CFLAGS="-ggdb"
			else
			  CFLAGS="-g"
			fi
			CFLAGS="$CFLAGS -Wshadow  -Wconversion"
		      else
			CFLAGS="-g"
		      fi
		   fi
                fi
        ],
	[
	    if test "X$CFLAGS" = "X"; then # if CFLAGS are unset
	      if test "$GCC" = yes; then
		CFLAGS="-O2"
	      else
		CFLAGS=
	      fi
	    fi
	]
)

AC_ARG_WITH(user,
        [  --with-user=privoxy            Set user under which privoxy run],
        [
                if test "x$withval" != "xyes"; then
                    USER=$with_user;
                  else
                   AC_MSG_ERROR(We need a user if you give me this parameter)
                fi
        ],
        [
          USER=privoxy;
        ]
)
AC_SUBST(USER)

AC_ARG_WITH(group,
        [  --with-group=privoxy         Set group for privoxy],
        [
                if test "x$withval" != "xyes"; then
                    GROUP=$with_group;
                  else
                   AC_MSG_ERROR(We need a group if you give me this parameter)
                fi
        ],
        [
          GROUP=privoxy;
        ]
)
AC_SUBST(GROUP)
dnl =================================================================
dnl additional gcc flags
dnl =================================================================
dnl 
if test "$GCC"; then
  CFLAGS="-pipe $CFLAGS"
fi


dnl =================================================================
dnl Build type
dnl =================================================================
dnl
dnl Must do this first.
dnl
dnl Reason: This sets CFLAGS in order to switch the Cygwin compiler
dnl into Cygwin or MinGW32 modes.  Depending on the mode selected,
dnl the compiler will use completely different sets of library
dnl and include files.
dnl 
dnl =================================================================

AC_MINGW32
AC_CYGWIN

if test "$MINGW32" = "yes"; then
  target_type=mingw
else
  if test "$CYGWIN" = "yes"; then
    target_type=cygwin
  else
    target_type=unix
  fi
fi

if test $dodk = auto; then
	dodk=no
	if test $target_type = unix; then
		case "$host_os" in
		linux* | gnu*)
			dodk=yes
		;;
		esac
	fi
fi

dnl Decide what to do based on target_type
dnl Note: PTHREAD_LIB is always set, even if pthread is disabled.
dnl This is because we don't know yet whether pthread is enabled.

AC_ARG_ENABLE(mingw32,
[  --enable-mingw32        Use mingw32 for a Windows GUI],
[if test $enableval = yes; then
  target_type=mingw
fi])

if test $target_type = mingw; then
  WIN_ONLY=
  SPECIAL_CFLAGS="-mwindows -mno-cygwin"
  PTHREAD_LIB=-lpthreadGC
  echo "Using mingw32 (Win32 GUI)"
else
  WIN_ONLY=#
  if test $target_type = cygwin; then
    SPECIAL_CFLAGS="-mno-win32"
    PTHREAD_LIB=
    echo "Using Cygnus (Win32 command line)"
  else
    SPECIAL_CFLAGS=
    PTHREAD_LIB=-lpthread
  fi
fi
AC_SUBST(WIN_ONLY)

dnl Checking which text html browser we have avaliable
if test $dodk != no; then
	AC_CHECK_PROGS(WDUMP,w3m lynx links,false)
	if test "$WDUMP" = false; then
		AC_MSG_ERROR(You need some kind of text browser to continue \(w3m, lynx and links are supported\))
	fi
	if test $DB2HTML = false; then
		dnl We need to clean the variable, otherwise AC_CHECK_PROGS
		dnl will fail	
		DB2HTML=""
		AC_CHECK_PROGS(DB2HTML,db2html docbook2html,false)
	fi
fi
AC_SUBST(WDUMP)
AC_SUBST(DB2HTML)

dnl If we use rpm, we need to check where %_topdir is
AC_CHECK_PROGS(RPMBIN,rpm,false)
if test $RPMBIN != false; then
		RPM_BASE=`rpm --eval "%{_topdir}"`
		if test "$RPM_BASE" = ""; then
			RPM_BASE=/usr/src/redhat
		fi
fi
AC_SUBST(RPM_BASE)

dnl Check for jade, so we can build the documentation
AC_CHECK_PROGS(JADEBIN,jade openjade,false)
AC_SUBST(JADEBIN)

dnl Check for man2html for docs.
AC_CHECK_PROGS(MAN2HTML,man2html,false)
AC_SUBST(MAN2HTML)

dnl Checking for the docbook.dsl stylesheet file
dnl It is still not portable (directory slash)
JADECAT=""
if test $dodk = yes; then
  if test $DKPREFIX = none; then
    for i in /usr/share/sgml/docbook/dsssl-stylesheets /usr/share/sgml/docbkdsl /usr/share/sgml/docbook-dsssl; do
      echo -n "checking for $i/html/docbook.dsl..."
      if test -f $i/html/docbook.dsl; then
        echo "yes"
        DKPREFIX=$i
        break
      else
        echo "no"
      fi
    done
# where are the catalogs?
    for i in /usr/share/sgml/CATALOG.docbk30 /usr/share/sgml/CATALOG.docbk31; do
      echo -n "checking for $i..."
      if test -f $i; then
        echo "yes"
        JADECAT="$JADECAT -c $i"
      else
        echo "no"
      fi
    done
  fi
fi
AC_SUBST(JADECAT)
AC_SUBST(DKPREFIX)

dnl Save old CFLAGS so we can restore them later, then add SPECIAL_CFLAGS
old_CFLAGS_nospecial=$CFLAGS
CFLAGS="$CFLAGS $SPECIAL_CFLAGS"

# Hack to force AutoConf to use the CFLAGS we just set
dnl Warning: This may break with a future version of Autoconf
dnl          Tested with autoconf 2.13
ac_cpp='$CPP $CPPFLAGS $SPECIAL_CFLAGS'
ac_compile='${CC-cc} -c $CFLAGS $CPPFLAGS conftest.$ac_ext 1>&5'
ac_link='${CC-cc} -o conftest${ac_exeext} $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS 1>&5'


dnl =================================================================
dnl Thread support
dnl =================================================================

AC_CHECK_HEADER(pthread.h, [have_pthread=yes], [have_pthread=no])

AC_ARG_ENABLE(pthread,
[  --disable-pthread       Don't use POSIX threads (pthreads)],
[if test $enableval = no; then
  # Disable pthreads
  have_pthread=no
fi])

if test $have_pthread = yes; then
  PTHREAD_ONLY=
  AC_DEFINE(FEATURE_PTHREAD)
  echo Using POSIX threads
  if test "$GCC" = "yes"; then
    # Set a GCC specific switch:
    if test "$target_type" = "unix"; then
      # This compiler switch makes Linux thread-safe
      # Don't know about other OS's?  Is this switch
      # supported?
      PTHREAD_LIB=
      SPECIAL_CFLAGS="-pthread"
    fi
  fi
else
  PTHREAD_ONLY=#
  echo Using native threads
fi

AC_SUBST(PTHREAD_ONLY)

dnl =================================================================
dnl Support for thread-safe versions of gethostbyaddr, gethostbyname,
dnl gmtime and localtime
dnl =================================================================

dnl Next line needed to find the gethost*_r functions on Solaris
AC_CHECK_LIB(nsl, gethostbyname)

AC_CHECK_FUNC(gethostbyaddr_r, [
  AC_MSG_CHECKING([signature of gethostbyaddr_r])
  AC_TRY_COMPILE([
#   include <netdb.h>
  ], [
    struct hostent *h, *hp;
    char *a, *b;
    int l, bl, t, e;
    (void) gethostbyaddr_r(a, l, t, h, b, bl, &hp, &e)
  ], [
    AC_DEFINE(HAVE_GETHOSTBYADDR_R_8_ARGS)
    AC_MSG_RESULT([8 args])
  ], [
    AC_TRY_COMPILE([
#     include <netdb.h>
    ], [
      struct hostent *h;
      char *a, *b;
      int l, bl, t, e;
      (void) gethostbyaddr_r(a, l, t, h, b, bl, &e)
    ], [
      AC_DEFINE(HAVE_GETHOSTBYADDR_R_7_ARGS)
      AC_MSG_RESULT([7 args])
    ], [
      AC_TRY_COMPILE([
#       include <netdb.h>
      ], [
        struct hostent_data *d;
        struct hostent *h;
        char a,
        int l, t;
        (void) gethostbyaddr_r(a, l, t, h, d)
      ], [
        AC_DEFINE(HAVE_GETHOSTBYADDR_R_5_ARGS)
        AC_MSG_RESULT([5 args])
      ], [
        AC_MSG_RESULT(unrecognised)
      ])
    ])
  ])
], [
  AC_MSG_RESULT(no)
])

AC_CHECK_FUNC(gethostbyname_r, [
  AC_MSG_CHECKING([signature of gethostbyname_r])
  AC_TRY_COMPILE([
#   include <netdb.h>
  ], [
    struct hostent *h, *r;
    char *n, *b;
    int bl, e;
    (void) gethostbyname_r(n, h, b, bl, &r, &e)
  ], [
    AC_DEFINE(HAVE_GETHOSTBYNAME_R_6_ARGS)
    AC_MSG_RESULT([6 args])
  ], [
    AC_TRY_COMPILE([
#     include <netdb.h>
    ], [
      struct hostent *h;
      char *n, *b;
      int bl, e;
      (void) gethostbyname_r(n, h, b, bl, &e)
    ], [
      AC_DEFINE(HAVE_GETHOSTBYNAME_R_5_ARGS)
      AC_MSG_RESULT([5 args])
    ], [
      AC_TRY_COMPILE([
#       include <netdb.h>
      ], [
        struct hostent_data *d;
        struct hostent *h;
        char *n,
        (void) gethostbyname_r(n, h, d)
      ], [
        AC_DEFINE(HAVE_GETHOSTBYNAME_R_3_ARGS)
        AC_MSG_RESULT([3 args])
      ], [
        AC_MSG_RESULT(unrecognised)
      ])
    ])
  ])
], [
  AC_MSG_RESULT(no)
])

AC_CHECK_FUNC(gmtime_r, [
  AC_MSG_CHECKING([signature of gmtime_r])
  AC_TRY_COMPILE([
#   include <time.h>
  ], [
    struct time *t;
    struct tm *tm;
    (void) gmtime_r(t, tm)
  ], [
    AC_MSG_RESULT(ok)
    AC_DEFINE(HAVE_GMTIME_R)
  ], [
    AC_MSG_RESULT(unrecognised)
  ])
], [
  AC_MSG_RESULT(no)
])

AC_CHECK_FUNC(localtime_r, [
  AC_MSG_CHECKING([signature of localtime_r])
  AC_TRY_COMPILE([
#   include <time.h>
  ], [
    struct time *t;
    struct tm *tm;
    (void) localtime_r(t, tm)
  ], [
    AC_MSG_RESULT(ok)
    AC_DEFINE(HAVE_LOCALTIME_R)
  ], [
    AC_MSG_RESULT(unrecognised)
  ])
], [
  AC_MSG_RESULT(no)
])

dnl =================================================================
dnl Solaris specific
dnl FIXME: Not tested on Solaris yet...
dnl =================================================================


SOCKET_LIB=

case "$host" in
*-solaris*) SOCKET_LIB="-lsocket -lnsl"
            AC_DEFINE(__EXTENSIONS__)
            if test "$GCC" = "yes"; then
              # Set a GCC specific switch:
              # This compiler switch makes Solaris thread-safe
              PTHREAD_LIB=
              SPECIAL_CFLAGS="-pthreads"
            else
              # What do we do without GCC? Guess this:
              SPECIAL_CFLAGS="-D_REENTRANT"
            fi
;;
esac

AC_SUBST(SOCKET_LIB)

dnl =================================================================
dnl OS/2 specific
dnl =================================================================

case "$host" in
*-os2-emx*) SOCKET_LIB=-lsocket
;;
esac

AC_SUBST(SOCKET_LIB)

dnl =================================================================
dnl Mac OSX specific
dnl =================================================================
    
case "$host" in
*-apple-darwin*) SPECIAL_CFLAGS="-Dunix"
;;  
esac

dnl =================================================================
dnl AmigaOS specific
dnl =================================================================

AMIGAOS_ONLY=#

case "$host" in
*-amigaos) AMIGAOS_ONLY=
;;
esac

AC_SUBST(AMIGAOS_ONLY)

dnl =================================================================
dnl Check for standard compiler stuff
dnl =================================================================

AC_EXEEXT
AC_OBJEXT
AC_HEADER_STDC
AC_HEADER_DIRENT
AC_C_CONST
AC_TYPE_SIZE_T
AC_TYPE_PID_T
AC_HEADER_TIME
AC_STRUCT_TM
AC_CHECK_SIZEOF(int, 4)
AC_CHECK_SIZEOF(char *, 4)
AC_CHECK_SIZEOF(long, 4)
AC_CHECK_SIZEOF(long long, 8)
AC_CHECK_SIZEOF(size_t, 4)

dnl Checks for header files.
dnl AC_HEADER_SYS_WAIT
dnl AC_CHECK_HEADERS(fcntl.h limits.h malloc.h sys/time.h unistd.h)
AC_CHECK_HEADERS([OS.h arpa/inet.h errno.h fcntl.h limits.h locale.h netdb.h netinet/in.h stddef.h stdlib.h string.h sys/ioctl.h sys/socket.h sys/time.h sys/timeb.h sys/wait.h unistd.h])

dnl Checks for library functions.
dnl AC_TYPE_SIGNAL
dnl AC_CHECK_FUNC(strstr)
dnl bcopy and memmove are for PCRE
AC_CHECK_FUNCS([strerror bcopy memmove])
AC_PROG_GCC_TRADITIONAL
dnl uncommenting does not work for swa. suse linux
dnl AC_FUNC_MALLOC
AC_FUNC_SETPGRP
AC_TYPE_SIGNAL
dnl uncommenting does not work for swa. suse linux
dnl AC_FUNC_STAT
AC_CHECK_FUNCS([atexit getcwd gethostbyaddr gethostbyname inet_ntoa localtime_r memchr memmove memset regcomp select setlocale socket strchr strdup strerror strftime strstr strtoul])


dnl =================================================================
dnl Checks for libraries.
dnl =================================================================
dnl Note: Some systems may have the library but not the system header
dnl       file, so we must check for both.
dnl       Also check for correct version
AC_CHECK_LIB(pcre, pcre_compile, [AC_CHECK_HEADER(pcre.h, [AC_EGREP_HEADER(pcre_fullinfo, pcre.h, [have_pcre=yes], [AC_MSG_WARN([[pcre old version installed]]); have_pcre=no])], [have_pcre=no])], [have_pcre=no])
AC_CHECK_LIB(pcreposix, regcomp, [AC_CHECK_HEADER(pcreposix.h, [AC_EGREP_HEADER(pcreposix_regerror, pcreposix.h, [AC_MSG_WARN([[pcreposix old version installed]]); have_pcreposix=no], [have_pcreposix=yes])], [have_pcreposix=no])], [have_pcreposix=no], -lpcre)
AC_CHECK_LIB(pcrs, pcrs_compile, [AC_CHECK_HEADER(pcrs.h, [have_pcrs=yes], [have_pcrs=no])], [have_pcrs=no])


dnl =================================================================
dnl Always defined
dnl =================================================================

AC_DEFINE(__MT__)

dnl =================================================================
dnl Features
dnl =================================================================

AC_ARG_ENABLE(toggle,
[  --disable-toggle         Don't support temporary disable],
[if test $enableval = yes; then
  AC_DEFINE(FEATURE_TOGGLE)
fi],AC_DEFINE(FEATURE_TOGGLE))

AC_ARG_ENABLE(force,
[  --disable-force          Don't allow single-page disable],
[if test $enableval = yes; then
  AC_DEFINE(FEATURE_FORCE_LOAD)
fi],AC_DEFINE(FEATURE_FORCE_LOAD))

AC_ARG_ENABLE(fast-redirects,
[  --disable-fast-redirects Don't support fast redirects],
[if test $enableval = yes; then
  AC_DEFINE(FEATURE_FAST_REDIRECTS)
fi], AC_DEFINE(FEATURE_FAST_REDIRECTS))

AC_ARG_ENABLE(killpopup,
[  --disable-killpopup      Never block popups],
[if test $enableval = yes; then
  AC_DEFINE(FEATURE_KILL_POPUPS)
fi],AC_DEFINE(FEATURE_KILL_POPUPS))

AC_ARG_ENABLE(stats,
[  --disable-stats          Don't keep statistics],
[if test $enableval = yes; then
  AC_DEFINE(FEATURE_STATISTICS)
fi],AC_DEFINE(FEATURE_STATISTICS))

AC_ARG_ENABLE(ie-images,
[  --disable-ie-images      Don't auto-detect whether a request from MS Internet
                           Explorer is for an image or HTML.],
[if test $enableval = yes; then
  AC_DEFINE(FEATURE_IMAGE_DETECT_MSIE)
fi],
AC_DEFINE(FEATURE_IMAGE_DETECT_MSIE))

AC_ARG_ENABLE(image-blocking,
[  --disable-image-blocking Don't try to figure out whether a request is 
                           for an image or HTML - assume HTML.],
[if test $enableval = yes; then
  AC_DEFINE(FEATURE_IMAGE_BLOCKING)
fi],
AC_DEFINE(FEATURE_IMAGE_BLOCKING))

AC_ARG_ENABLE(acl-files,
[  --disable-acl-files      Prevents the use of ACL files to control access to
                           the proxy by IP address.],
[if test $enableval = yes; then
  AC_DEFINE(FEATURE_ACL)
fi],
AC_DEFINE(FEATURE_ACL))

AC_ARG_ENABLE(trust-files,
[  --disable-trust-files    Prevents the use of trust files.],
[if test $enableval = yes; then
  AC_DEFINE(FEATURE_TRUST)
fi],
AC_DEFINE(FEATURE_TRUST))

AC_ARG_ENABLE(jar-files,
[  --disable-jar-files      Prevents the use of jar files to capture cookies.],
[if test $enableval = yes; then
  AC_DEFINE(FEATURE_COOKIE_JAR)
fi],
AC_DEFINE(FEATURE_COOKIE_JAR))

AC_ARG_ENABLE(editor,
[  --disable-editor         Prevents the use of the web-based actions file
                           editor and web-based temporary disable setting.],
[if test $enableval = yes; then
  AC_DEFINE(FEATURE_CGI_EDIT_ACTIONS)
fi],
AC_DEFINE(FEATURE_CGI_EDIT_ACTIONS))

AC_ARG_ENABLE(no-gifs,
[  --enable-no-gifs         Use politically correct PNG format instead of GIF
                           for built-in images. May not work with all browsers.],
[if test $enableval = yes; then
  AC_DEFINE(FEATURE_NO_GIFS)
fi])


dnl pcre/pcrs is needed for CGI anyway, so
dnl the choice is only between static and
dnl dynamic:

AC_ARG_ENABLE(dynamic-pcre,
[  --disable-dynamic-pcre        Use the built-in, static pcre, even if
                                libpcre is available],
[ if test $enableval = "no"; then have_pcre=no; fi ])

AC_ARG_ENABLE(dynamic-pcrs,
[  --disable-dynamic-pcrs        Use the built-in, static pcrs, even if
                                libpcrs is available],
[ if test $enableval = "no"; then have_pcrs=no; fi ])


# If we have libpcre and either we also have pcreposix or
# we don't need pcreposix, then link pcre dynamically; else
# build it and link statically
#
if test $have_pcre = "yes"; then
  echo "using libpcre"
  pcre_dyn=yes
  STATIC_PCRE_ONLY=#
  LIBS="$LIBS -lpcre -lpcreposix"
else
  echo "using built-in static pcre"
  pcre_dyn=no
  AC_DEFINE(STATIC_PCRE)
  STATIC_PCRE_ONLY=
fi

# If we have libpcrs and pcre is linked dynamically
# then also link pcrs dynamically, else build and link
# pcrs statically
#
if test $have_pcrs = "yes" -a $pcre_dyn = "yes"; then
  echo "using libpcrs"
  STATIC_PCRS_ONLY=#
  LIBS="$LIBS -lpcrs"
else
  echo "using built-in static pcrs"
  AC_DEFINE(STATIC_PCRS)
  STATIC_PCRS_ONLY=
fi

AC_SUBST(STATIC_PCRE_ONLY)
AC_SUBST(STATIC_PCRS_ONLY)

dnl =================================================================
dnl Final cleanup and output
dnl =================================================================

dnl Remove the SPECIAL_CFLAGS stuff from CFLAGS, and add it seperately
dnl in the Makefile
CFLAGS=$old_CFLAGS_nospecial
AC_SUBST(SPECIAL_CFLAGS)

AC_SUBST(PTHREAD_LIB)

AC_OUTPUT(GNUmakefile)