Bug 2795: pt 2: ARP lookups require IPv4-only socket on Linux/Solaris

[thirdparty/squid.git] / configure.in

dnl  Configuration input file for Squid
dnl
dnl  $Id$
dnl
dnl
dnl
AC_INIT([Squid Web Proxy],[3.HEAD-BZR],[http://www.squid-cache.org/bugs/],[squid])
AC_PREREQ(2.61)
AC_CONFIG_HEADERS([include/autoconf.h])
AC_CONFIG_AUX_DIR(cfgaux)
AC_CONFIG_SRCDIR([src/main.cc])
AM_INIT_AUTOMAKE([tar-ustar nostdinc])
AC_REVISION($Revision$)dnl
AC_PREFIX_DEFAULT(/usr/local/squid)
AM_MAINTAINER_MODE

PRESET_CFLAGS="$CFLAGS"
PRESET_LDFLAGS="$LDFLAGS"

dnl Set default LDFLAGS
if test -z "$LDFLAGS"; then
        LDFLAGS="-g"
fi

dnl Check for GNU cc
AC_PROG_CC
AM_PROG_CC_C_O
AC_PROG_CXX
AC_LANG([C++])
AC_CANONICAL_HOST

dnl Make the squid top srcdir available to sub-packages as --with-squid=PATH
new_configure_args="$ac_configure_args --with-squid=$ac_abs_confdir"
ac_configure_args="$new_configure_args"


use_loadable_modules=1
AC_MSG_CHECKING(whether to use loadable modules)
AC_ARG_ENABLE(loadable-modules,
    AS_HELP_STRING([--disable-loadable-modules],[do not support loadable modules]) ,
    [
        case "${enableval}" in
            yes) use_loadable_modules=yes ;;
            no) use_loadable_modules=no ;;
            *) AC_MSG_ERROR(bad value ${enableval} for --disable-loadable-modules) ;;
        esac
        AC_MSG_RESULT([$use_loadable_modules, explicitly])
    ],
    [
        use_loadable_modules=yes;
        AC_MSG_RESULT([$use_loadable_modules, implicitly])
    ]
)

AM_CONDITIONAL(USE_LOADABLE_MODULES, test $use_loadable_modules = yes)

if test $use_loadable_modules = yes;
then
    AC_DEFINE(USE_LOADABLE_MODULES, 1, [Support Loadable Modules])
    AC_ENABLE_SHARED
else
    AC_DISABLE_SHARED
fi

AC_LIBTOOL_DLOPEN
if test $use_loadable_modules = yes;
then
    dnl Linux LTDL v3-v7 macros assume the autoconf 2.62 variable top_build_prefix is defined
    dnl But from autoconf 2.64 its called ac_top_build_prefix and not automatically added to the Makefile
    top_build_prefix=${ac_top_build_prefix}
    AC_SUBST(top_build_prefix)

    AC_LIBLTDL_CONVENIENCE(lib/libLtdl)
fi
AC_PROG_LIBTOOL
AC_LTDL_DLLIB

# Do we need these unconditionally for "make distcheck" to work?
AC_SUBST(INCLTDL)
AC_SUBST(LIBLTDL)

if test $use_loadable_modules = yes;
then
    # Why is this needed? Should not libtool's AC_LIBTOOL_DLOPEN do that?
    LIBADD_DL=${lt_cv_dlopen_libs}
    AC_SUBST([LIBADD_DL])
fi

AC_PROG_RANLIB


REGEXLIB=''	# -lregex
# LIBREGEX=''	# libregex.a

dnl find out the exe extension for this platform. If it's not empty, use it for CGI's as well.
AC_EXEEXT
AC_OBJEXT

if test -z "$EXEEXT"; then
	CGIEXT=".cgi"
else
	# automake automatically adds .exe when installing binaries
	CGIEXT=""
fi
AC_SUBST(CGIEXT)

dnl this should be expanded to a list of platform sensible support requirements.
dnl (adding an option like --enable-cygwin-support doesn't make sense :]) - R Collins 2001
case "$host_os" in
mingw|mingw32|cygwin|cygwin32)
        AM_CONDITIONAL(ENABLE_WIN32SPECIFIC, true)
	;;
*)
	AM_CONDITIONAL(ENABLE_WIN32SPECIFIC, false)
	;;
esac

case "$host_os" in
mingw|mingw32)
	AC_PATH_PROG(WIN32_PSAPI, psapi.dll, none)
	CFLAGS="$CFLAGS -mthreads"
	CXXFLAGS="$CXXFLAGS -mthreads"
	if test "$ac_cv_path_WIN32_PSAPI" = "none"; then
		AC_MSG_NOTICE([PSAPI.DLL is recommended to run Squid on Windows NT Platform])
		AC_MSG_NOTICE([Please see PSAPI.DLL section on doc/win32-relnotes.html.])
	else
		AC_DEFINE(HAVE_WIN32_PSAPI,1,[Define if you have PSAPI.DLL on Windows systems])
		LIBS="$LIBS -lpsapi"
	fi
	MINGW_LIBS="-lmingwex"
	AM_CONDITIONAL(USE_IPC_WIN32, true)
	AC_SUBST(MINGW_LIBS)
	;;
*)
	AM_CONDITIONAL(USE_IPC_WIN32, false)
	;;
esac

if test -z "$CACHE_HTTP_PORT"; then
	CACHE_HTTP_PORT="3128"
fi
if test -z "$CACHE_ICP_PORT"; then
	CACHE_ICP_PORT="3130"
fi

dnl Substitutions
AC_DEFINE_UNQUOTED(CACHE_HTTP_PORT, $CACHE_HTTP_PORT,
[What default TCP port to use for HTTP listening?])
AC_SUBST(CACHE_HTTP_PORT)
AC_DEFINE_UNQUOTED(CACHE_ICP_PORT, $CACHE_ICP_PORT,
[What default UDP port to use for ICP listening?])
AC_SUBST(CACHE_ICP_PORT)

AC_DEFINE_UNQUOTED(CONFIG_HOST_TYPE, "$host",[Host type from configure])

AC_DEFINE_UNQUOTED(SQUID_CONFIGURE_OPTIONS, "$ac_configure_args", [configure command line used to configure Squid])

CACHE_EFFECTIVE_USER="nobody"
AC_ARG_WITH(default-user,
  AS_HELP_STRING([--with-default-user=USER],[System user account for squid permissions. Default: nobody]),
 [ CACHE_EFFECTIVE_USER="$withval" ]
)
AC_SUBST(CACHE_EFFECTIVE_USER)

DEFAULT_LOG_DIR="$localstatedir/logs"
AC_ARG_WITH(logdir,
  AS_HELP_STRING([--with-logdir=PATH],[Default location for squid logs. default: $DEFAULT_LOG_DIR]),
 [ case $withval in
   yes|no)
     AC_MSG_ERROR( --with-logdir requires a directory PATH. --with-logdir=PATH )
     ;;
   *)
     DEFAULT_LOG_DIR="$withval"
     ;;
   esac
 ]
)
AC_SUBST(DEFAULT_LOG_DIR)

DEFAULT_PIDFILE="$DEFAULT_LOG_DIR/squid.pid"
AC_ARG_WITH(pidfile,
  AS_HELP_STRING([--with-pidfile=PATH],[Default location for squid PID file. default: $DEFAULT_PIDFILE]),
 [ case $withval in
   yes|no)
     AC_MSG_ERROR( --with-pidfile requires a file PATH. --with-pidfile=PATH )
     ;;
   *)
     DEFAULT_PIDFILE="$withval"
     ;;
   esac
 ]
)
AC_SUBST(DEFAULT_PIDFILE)

dnl Gerben Wierda <Gerben_Wierda@RnA.nl>
case "$host" in
    mab-next-nextstep3)
	CC="$CC -arch m68k -arch i486 -arch hppa -arch sparc"
	;;
esac

if test "$GCC" = "yes"; then
    GCCVER=`$CC -v 2>&1 | awk '$2 ==  "version" {print $3}'`
    GCCVER2=`echo $GCCVER | awk '{print $1 * 100}'`
    case "$host" in
    i386-*-freebsd*)
	if test $GCCVER2 -lt 300 ; then
	    AC_MSG_FAILURE([GCC $GCCVER causes a coredump on $host. Try a more recent GCC version])
	    sleep 5
	fi
	;;
    esac
    unset GCCVER
    unset GCCVER2
fi

dnl Set Default CFLAGS
if test -z "$PRESET_CFLAGS"; then
    if test "$GCC" = "yes"; then
        case "$host" in
	*-sun-sunos*)
    	    # sunos has too many warnings for this to be useful
	    # motorola too
    	    ;;
	*m88k*)
	    # Motorola cc/ld does not like -02 but is ok on -O
	    CFLAGS=`echo $CFLAGS | sed -e 's/-O[0-9]/-O/'`
	    ;;
        *)
    	    CFLAGS="-Wall $CFLAGS"
    	    ;;
        esac
    else
	case "$host" in
	*mips-sgi-irix6.*)
	    # suggested by Rafael Seidl <rafaels@cthulhu.engr.sgi.com>
	    CFLAGS="-O3 -OPT:Olimit=0:space=OFF \
		-woff 1009,1014,1110,1116,1183,1185,1188,1204,1230,1233,1355 \
		-Wl,-woff,85,-woff,84,-woff,134 \
		-nostdinc -I/usr/include -D_BSD_SIGNALS $CFLAGS"
	    CXXFLAGS="-O3 -OPT:Olimit=0:space=OFF \
		-woff 1009,1014,1110,1116,1183,1185,1188,1204,1230,1233,1355 \
		-Wl,-woff,85,-woff,84,-woff,134 \
		-nostdinc -I/usr/include -D_BSD_SIGNALS $CXXFLAGS"
	    ;;
	alpha-dec-osf4.*)
	    # Mogul says DEC compilers take both -g and -O2
	    CFLAGS=`echo $CFLAGS | sed -e 's/-g/-g3/'`
	    CFLAGS="-O2 $CFLAGS"
	    ;;
	*)
	    ;;
	esac
    fi
fi

dnl set squid required flags
if test "$GCC" = "yes"; then
dnl Guido Serassio (serassio@squid-cache.org) 20070811
dnl Using the latest MinGW (gcc 3.4.5 + mingw-runtime 3.13) cannot build with
dnl -Werror -Wmissing-prototypes -Wmissing-declarations
dnl TODO: check if the problem will be present in any other newer MinGW release.
    case "$host_os" in
    mingw|mingw32)
        SQUID_CFLAGS="-Wall -Wpointer-arith -Wwrite-strings -Wcomments"
	;;
    *)
        SQUID_CFLAGS="-Werror -Wall -Wpointer-arith -Wwrite-strings -Wmissing-prototypes -Wmissing-declarations -Wcomments"
	;;
    esac
    SQUID_CXXFLAGS="-Werror -Wall -Wpointer-arith -Wwrite-strings -Wcomments"
else
    SQUID_CFLAGS=
    SQUID_CXXFLAGS=
fi
AC_SUBST(SQUID_CFLAGS)
AC_SUBST(SQUID_CXXFLAGS)

AC_TEST_CHECKFORHUGEOBJECTS
SQUID_CXXFLAGS="$SQUID_CXXFLAGS $HUGE_OBJECT_FLAG"

dnl Set LDFLAGS
if test -z "$PRESET_LDFLAGS"; then
    if test "$GCC" = "yes"; then
        case "$host" in
	*mips-sgi-irix6.*)
	    # Silence Linker warnings 84, 85 and 134
    	    LDFLAGS="-Wl,-woff,85 -Wl,-woff,84 -Wl,-woff,134 $LDFLAGS"
    	    ;;
        *)
    	    # nothing
	    ;;
        esac
    else
	case "$host" in
        *)
    	    # nothing
	    ;;
	esac
    fi
fi

SquidInline="yes"

AC_ARG_ENABLE(optimizations,
  AS_HELP_STRING([--disable-optimizations],[Don't compile Squid with compiler optimizations enabled.
                  Optimization is good for production builds, but not
                  good for debugging. During development, use
                  --disable-optimizations to reduce compilation times
                  and allow easier debugging. This option implicitly
                  also enabled --disable-inline]),
[ if test "$enableval" = "no" ; then
	AC_MSG_NOTICE([Disabling compiler optimizations (-O flag)])
	CFLAGS="`echo $CFLAGS | sed -e 's/-O[[0-9]]*//'`"
	CXXFLAGS="`echo $CXXFLAGS | sed -e 's/-O[[0-9]]*//'`"
        SquidInline="no"
  fi
])

AC_ARG_ENABLE(inline,
  AS_HELP_STRING([--disable-inline],[Don't compile trivial methods as inline. Squid
                  is coded with much of the code able to be inlined.
                  Inlining is good for production builds, but not
                  good for development. During development, use
                  --disable-inline to reduce compilation times and
                  allow incremental builds to be quick. For
                  production builds, or load tests, use
                  --enable-inline to have squid make all trivial
                  methods inlinable by the compiler.]),
[ if test "$enableval" = "no" ; then
     SquidInline="no"
   fi
])

if test "$SquidInline" = "yes" ; then
    AC_DEFINE(_SQUID_INLINE_, inline, [Keyword used by squid for inlining methods])
    AC_DEFINE(_USE_INLINE_,, [Include inline methods into header file])
else
    AC_MSG_NOTICE([Inlining optimization disabled])
    AC_DEFINE(_SQUID_INLINE_,, [Keyword used by squid for inlining methods])
fi

AC_ARG_ENABLE(debug-cbdata,
  AS_HELP_STRING([--enable-debug-cbdata],[Provide some debug information in cbdata]),
[ if test "$enableval" = "yes" ; then
    AC_MSG_NOTICE([cbdata debugging enabled])
    AC_DEFINE(CBDATA_DEBUG,1,[Enable for cbdata debug information])
  fi
])

dnl Nasty hack to get autoconf 2.64 on Linux to run.
dnl all other uses of RUN_IFELSE are wrapped inside CACHE_CHECK which breaks on 2.64
AC_RUN_IFELSE([AC_LANG_SOURCE([[ int main(int argc, char **argv) { return 0; } ]])],[],[],[])

dnl This is a developer only option.. developers know how to set defines
dnl
dnl AC_ARG_ENABLE(xmalloc-debug,
dnl [  --enable-xmalloc-debug  Do some simple malloc debugging],
dnl [ if test "$enableval" = "yes" ; then
dnl     AC_MSG_NOTICE([malloc debugging enabled])
dnl     AC_DEFINE(XMALLOC_DEBUG,1,[Define to do simple malloc debugging])
dnl   fi
dnl ])

dnl This is a developer only option.. developers know how to set defines
dnl
dnl AC_ARG_ENABLE(xmalloc-debug-trace,
dnl [  --enable-xmalloc-debug-trace
dnl                           Detailed trace of memory allocations],
dnl [ if test "$enableval" = "yes" ; then
dnl     AC_MSG_NOTICE([malloc debug trace enabled])
dnl     AC_DEFINE(XMALLOC_TRACE,1,[Define to have a detailed trace of memory allocations])
dnl     AC_DEFINE(XMALLOC_DEBUG,1)
dnl   fi
dnl ])

AC_ARG_ENABLE(xmalloc-statistics,
  AS_HELP_STRING([--enable-xmalloc-statistics],[Show malloc statistics in status page]),
[ if test "$enableval" = "yes" ; then
    AC_MSG_NOTICE([malloc statistics enabled])
    AC_DEFINE(XMALLOC_STATISTICS,1,[Define to have malloc statistics])
  fi
])

AC_ARG_ENABLE(async-io,
  AS_HELP_STRING([--enable-async-io[=N_THREADS]],[Shorthand for "--with-aufs-threads=N_THREADS --with-pthreads
                  --enable-storeio=ufs,aufs"]),
[ case $enableval in
  yes)
	with_pthreads="yes"
	STORE_MODULES="ufs aufs"
    ;;
  no)
    ;;
  *)
  	aufs_io_threads=$enableval
	with_pthreads="yes"
	STORE_MODULES="ufs aufs"
    ;;
  esac
])

AC_ARG_WITH(aufs-threads,
  AS_HELP_STRING([--with-aufs-threads=N_THREADS],[Tune the number of worker threads for the aufs object store.]),
[ case $withval in
  [[0-9]]*)
    aufs_io_threads=$withval
    ;;
  *)
    AC_MSG_ERROR(--with-aufs-threads expects a numeric argument)
    ;;
  esac
])
if test "$aufs_io_threads"; then
    AC_MSG_NOTICE([With $aufs_io_threads aufs threads])
    AC_DEFINE_UNQUOTED(AUFS_IO_THREADS,$aufs_io_threads,
    [Defines how many threads aufs uses for I/O])
fi

AC_ARG_WITH(dl,
  AS_HELP_STRING([--with-dl],[Use dynamic linking]))
if test "$with_dl" = "yes"; then
  AC_MSG_NOTICE([With dl])
fi

AC_ARG_ENABLE(disk-io,
  AS_HELP_STRING([--enable-disk-io="list of modules"],[Build support for the list of disk I/O modules.
                  Set without a value or omitted, all available modules will be built.
                  See src/DiskIO for a list of available modules, or
                  Programmers Guide section on DiskIO
                  for details on how to build your custom disk module]),
[ case $enableval in
  yes)
	for dir in $srcdir/src/DiskIO/*; do
	    module="`basename $dir`"
	    if test -d "$dir" && test "$module" != CVS; then
		AC_MSG_NOTICE([Autodetected $module DiskIO module])
		MAYBE_DISK_MODULES="$MAYBE_DISK_MODULES $module"
	    fi
	done
	AC_DEFINE(USE_DISKIO,1,[DiskIO modules are expected to be available.])
  	;;
  no)
	AC_DEFINE(USE_DISKIO,0,[DiskIO modules are expected to be available.])
  	;;
  *)
	MAYBE_DISK_MODULES=" `echo $enableval| sed -e 's/,/ /g;s/  */ /g'` "
	AC_DEFINE(USE_DISKIO,1,[DiskIO modules are expected to be available.])
	;;
  esac
],
[ if test -z "$MAYBE_DISK_MODULES"; then
  AC_MSG_NOTICE([Enabling all available DiskIO modules (default)...])
  for dir in $srcdir/src/DiskIO/*; do
    module="`basename $dir`"
    if test -d "$dir" && test "$module" != CVS; then
	AC_MSG_NOTICE([Autodetected $module DiskIO module])
	MAYBE_DISK_MODULES="$MAYBE_DISK_MODULES $module"
    fi
  done
  AC_DEFINE(USE_DISKIO,1,[DiskIO modules are expected to be available.])
fi ])

dnl Some autoconf.h defines we might enable later...
AC_DEFINE(USE_DISKIO_AIO, 0, [Whether POSIX AIO support is needed. Automatic])
AC_DEFINE(USE_DISKIO_DISKTHREADS, 0, [Whether pthreads support is needed. Automatic])
USE_AIOPS_WIN32=0
use_aio=
use_diskthreads=
AIOLIB=

dnl Setup the module paths etc.
FOUND_DISKIO_AIO=
FOUND_DISKIO_BLOCKING=
FOUND_DISKIO_DISKDAEMON=
FOUND_DISKIO_DISKTHREADS=
DISK_LIBS=
DISK_MODULES=
DISK_LINKOBJS=
for module in $MAYBE_DISK_MODULES none; do
  if test "$module" = "none"; then
	continue
  fi
  if ! test -d $srcdir/src/DiskIO/$module; then
    AC_MSG_ERROR(disk-io $module does not exist)
  fi
  case "$module" in
    DiskDaemon)
	if test "$FOUND_DISKIO_DISKDAEMON" = "yes" ; then
	  AC_MSG_ERROR([DiskIO DiskDaemon module listed twice.])
	fi
	FOUND_DISKIO_DISKDAEMON="yes"
	AC_MSG_NOTICE([Enabling DiskDaemon DiskIO module])
	DISK_LIBS="$DISK_LIBS libDiskDaemon.a"
	DISK_MODULES="$DISK_MODULES DiskDaemon"
	DISK_PROGRAMS="$DISK_PROGRAMS DiskIO/DiskDaemon/diskd"
	DISK_LINKOBJS="$DISK_LINKOBJS DiskIO/DiskDaemon/DiskDaemonDiskIOModule.o"
	;;
    DiskThreads)
	if test "$FOUND_DISKIO_DISKTHREADS" = "yes" ; then
	  AC_MSG_ERROR([DiskIO DiskThreads  module listed twice.])
	fi
	FOUND_DISKIO_DISKTHREADS="yes"
	use_diskthreads="yes"
	LIBPTHREADS=
	SAVE_SQUID_CFLAGS="$SQUID_CFLAGS"
	SAVE_SQUID_CXXFLAGS="$SQUID_CXXFLAGS"
	AC_ARG_WITH(pthreads,AS_HELP_STRING([--without-pthreads],[Disable POSIX Threads]))
	if test "$with_pthreads" != "no"; then
		dnl TODO: this needs to be extended to handle more systems and better
		dnl REF: http://www.openldap.org/lists/openldap-bugs/200006/msg00070.html
		dnl REF: http://autoconf-archive.cryp.to/acx_pthread.html
		case "$host" in
		mingw|mingw32)
			USE_AIOPS_WIN32=1
			AC_MSG_NOTICE([Windows threads support automatically enabled])
			;;
		i386-unknown-freebsd*)
			SQUID_CFLAGS="$SQUID_CFLAGS -D_REENTRANT"
			SQUID_CXXFLAGS="$SQUID_CXXFLAGS -D_REENTRANT"
			if test "$GCC" = "yes" ; then
				if test -z "$PRESET_LDFLAGS"; then
					LDFLAGS="$LDFLAGS -pthread"
				fi
			fi
			;;
		*-solaris2.*)
		    if test "$GCC" = "yes" ; then
			SQUID_CFLAGS="$SQUID_CFLAGS -D_REENTRANT -pthreads"
			SQUID_CXXFLAGS="$SQUID_CXXFLAGS -D_REENTRANT -pthreads"
		        AC_CHECK_LIB(pthread, main,[LIBPTHREADS="-lpthread"],
		          [ AC_MSG_NOTICE(pthread library required but cannot be found.)
			    use_diskthreads="no"
			  ])
		    else
			dnl test for -lpthread first. libc version is a stub apparently on Solaris.
			SQUID_CFLAGS="$SQUID_CFLAGS -D_REENTRANT -lpthread"
			SQUID_CXXFLAGS="$SQUID_CXXFLAGS -D_REENTRANT -lpthread"
			AC_CHECK_LIB(pthread, main,[LIBPTHREADS="-lpthread"],
			  [ SQUID_CFLAGS="$SAVE_SQUID_CFLAGS -D_REENTRANT -lpthread -mt"
			    SQUID_CXXFLAGS="$SAVE_SQUID_CXXFLAGS -D_REENTRANT -lpthread -mt"
				AC_CHECK_LIB(pthread, main,[LIBPTHREADS="-lpthread"],
			      [ AC_MSG_NOTICE(pthread library required but cannot be found.)
				use_diskthreads="no"
			      ])
			  ])
			fi
			;;
		*)
			SQUID_CFLAGS="$SQUID_CFLAGS -D_REENTRANT"
			SQUID_CXXFLAGS="$SQUID_CXXFLAGS -D_REENTRANT"
			AC_CHECK_LIB(pthread, main,[DISK_LIBS="$DISK_LIBS -lpthread"],
				[ AC_MSG_NOTICE(pthread library required but cannot be found.)
				  use_diskthreads="no"
				])
			;;
		esac
	else
		AC_MSG_NOTICE([Native pthreads support manually disabled.])
		use_diskthreads="no"
	fi
	if test "$use_diskthreads" = "yes" ; then
	  AC_DEFINE(USE_DISKIO_DISKTHREADS, 1, [Whether pthreads support is needed. Automatic])
	  AC_MSG_NOTICE([Enabling DiskThreads DiskIO module])
	  DISK_LIBS="$DISK_LIBS $LIBPTHREADS libDiskThreads.a"
	  DISK_MODULES="$DISK_MODULES DiskThreads"
	  DISK_LINKOBJS="$DISK_LINKOBJS DiskIO/DiskThreads/DiskThreadsDiskIOModule.o"
	else
	  AC_DEFINE(USE_DISKIO_DISKTHREADS, 0, [Whether pthreads support is needed. Automatic])
	  AC_MSG_NOTICE([Native pthreads support disabled. DiskThreads module automaticaly disabled.])
	  SQUID_CFLAGS="$SAVE_SQUID_CFLAGS"
	  SQUID_CXXFLAGS="$SAVE_SQUID_CXXFLAGS"
	fi
	;;

    AIO)
	if test "$FOUND_DISKIO_AIO" = "yes" ; then
	  AC_MSG_ERROR([DiskIO AIO module listed twice.])
	fi
	FOUND_DISKIO_AIO="yes"
	dnl Check for POSIX AIO availability
	use_aio="yes"
	AIOLIB=
	AC_ARG_WITH(aio, AS_HELP_STRING([--without-aio],[Do not use POSIX AIO. Default: auto-detect]))
	if test "$with_aio" != "no"; then
	    have_aio_header=no
	    AC_CHECK_HEADERS(aio.h,[have_aio_header=yes])
	    dnl On some systems POSIX AIO functions are in librt
	    dnl On some systems POSIX AIO functions are in libaio
	    AC_CHECK_LIB(rt,aio_read,[AIOLIB="-lrt"],AC_CHECK_LIB(aio,aio_read,[AIOLIB="-laio"],[]))
	  dnl Enable AIO if the library and headers are found
	  if test "$AIOLIB" != "" && test "$have_aio_header" = "yes"; then
	    AC_MSG_NOTICE([Native POSIX AIO support detected.])
	    use_aio="yes"
	  else
	    dnl Windows does things differently. We provide wrappers.
	    dnl TODO: Windows really needs its own DiskIO module or its Overlaped IO
	    case "$host_os" in
	      mingw|mingw32)
	        use_aio="yes"
	        AC_MSG_NOTICE([Windows being built. Maybe-enable POSIX AIO.])
	      ;;
	      *)
	        AC_MSG_NOTICE([Native POSIX AIO support not detected. AIO automatically disabled.])
	        use_aio="no"
	      ;;
	    esac
	  fi
	else
	  AC_MSG_NOTICE([POSIX AIO support manually disabled.])
	  use_aio="no"
	fi
	dnl Use the POSIX AIO pieces if we actually need them.
	if test "$use_aio" = "yes" ; then
	  AC_DEFINE(USE_DISKIO_AIO, 1, [Whether POSIX AIO support is needed. Automatic])
	  DISK_MODULES="$DISK_MODULES AIO"
	  DISK_LIBS="$DISK_LIBS libAIO.a"
	  DISK_LINKOBJS="$DISK_LINKOBJS DiskIO/AIO/AIODiskIOModule.o"
	  case "$host_os" in
	    mingw|mingw32)
		USE_AIO_WIN32=1
		AC_MSG_NOTICE([Replacing AIO DiskIO module with: Windows overlapped I/O support])
		;;
	    *)
		AC_MSG_NOTICE([Enabling AIO DiskIO module])
		;;
	  esac
	else
	  AC_MSG_NOTICE([AIO DiskIO Module disabled. Missing POSIX AIO support.])
	fi
	;;

    Blocking)
	if test "$FOUND_DISKIO_BLOCKING" = "yes" ; then
	  AC_MSG_ERROR([DiskIO Blocking module listed twice.])
	fi
	FOUND_DISKIO_BLOCKING="yes"
	AC_MSG_NOTICE([Enabling Blocking DiskIO module])
	DISK_LIBS="$DISK_LIBS libBlocking.a"
	DISK_MODULES="$DISK_MODULES Blocking"
	DISK_LINKOBJS="$DISK_LINKOBJS DiskIO/Blocking/BlockingDiskIOModule.o"
	;;

    *)
	AC_MSG_NOTICE([Enabling $module DiskIO module])
	DISK_LIBS="$DISK_LIBS lib${module}.a"
	DISK_MODULES="$DISK_MODULES ${module}"
	DISK_LINKOBJS="$DISK_LINKOBJS DiskIO/${module}/${module}DiskIOModule.o"
	;;
    esac
done
AC_MSG_NOTICE([IO Modules built: $DISK_MODULES])
AC_SUBST(DISK_MODULES)
AC_SUBST(DISK_LIBS)
AC_SUBST(DISK_PROGRAMS)
AC_SUBST(DISK_LINKOBJS)
AC_SUBST(AIOLIB)
AM_CONDITIONAL([USE_AIOPS_WIN32], [test "$USE_AIOPS_WIN32" = 1])
AM_CONDITIONAL([USE_AIO_WIN32], [test "$USE_AIO_WIN32" = 1])


dnl Check what Storage formats are wanted.
dnl This version will error out with a message saying why if a required DiskIO is missing.
AC_ARG_ENABLE(storeio,
  AS_HELP_STRING([--enable-storeio="list of modules"],[Build support for the list of store I/O modules.
                  The default is only to build the "ufs" module.
                  See src/fs for a list of available modules, or
                  Programmers Guide section <not yet written>
                  for details on how to build your custom store module]),
[ case $enableval in
  yes)
	for dir in $srcdir/src/fs/*; do
	    module="`basename $dir`"
	    if test -d "$dir" && test "$module" != CVS && test "$module" != coss; then
		STORE_MODULES="$STORE_MODULES $module"
	    fi
	done
  	;;
  no)
  	;;
  *)
	STORE_MODULES="`echo $enableval| sed -e 's/,/ /g;s/  */ /g'`"
	;;
  esac
],
[ if test -z "$STORE_MODULES"; then
    STORE_MODULES="ufs"
  fi
])
if test -n "$STORE_MODULES"; then
    dnl ensure that all modules a) exist and b) only include once.
    STORE_MODULES_FULL=$STORE_MODULES
    STORE_MODULES=
    for module in $STORE_MODULES_FULL; do
        have_mod=`echo "$STORE_MODULES" | grep "$module"`
        if test "$have_mod" != ""; then
	    AC_MSG_NOTICE([Removing duplicate $module from storeio])
	elif test -d $srcdir/src/fs/$module; then
	    STORE_MODULES="$STORE_MODULES $module"
	else
	    AC_MSG_ERROR(storeio $module does not exist)
	fi
    done
    for module in $STORE_MODULES_FULL; do
	case "$module" in
	coss)
	    echo "WARNING: COSS Support is not stable yet in Squid-3. Please do not use."
	    sleep 10
	    ;;
	esac
    done
    AC_MSG_NOTICE([Store modules built: $STORE_MODULES])
fi
for fs in $STORE_MODULES none; do
    case "$fs" in
    diskd)
	if ! test "$FOUND_DISKIO_BLOCKING" = "yes" && ! test "$FOUND_DISKIO_DISKDAEMON" = "yes" ; then
	  AC_MSG_ERROR([Storage diskd module requires DiskIO modules: Blocking or DiskDaemon])
	fi
	NEED_UFS="true"
	;;
    aufs)
	if ! test "$FOUND_DISKIO_BLOCKING" = "yes" && ! test "$FOUND_DISKIO_DISKTHREADS" = "yes" ; then
	  AC_MSG_ERROR([Storage diskd module requires DiskIO modules: Blocking or DiskThreads])
	fi
	NEED_UFS="true"
	;;
    coss)
	if ! test "$FOUND_DISKIO_AIO" = "yes"; then
	  AC_MSG_ERROR([COSS requires POSIX AIO which is not available.])
	fi
	dnl
	dnl Automake om MinGW needs explicit exe extension
	dnl for STORE_TESTS substition
	dnl
	STORE_TESTS="$STORE_TESTS tests/testCoss$EXEEXT"
	;;
    ufs)
	UFS_FOUND="true"
	STORE_TESTS="$STORE_TESTS tests/testUfs$EXEEXT"
    esac
done

if test -z "$UFS_FOUND" && test -n "$NEED_UFS"; then
    AC_MSG_NOTICE([Adding UFS, as it contains core logic for diskd and aufs])
    STORE_MODULES="$STORE_MODULES ufs"
    dnl
    dnl Automake om MinGW needs explicit exe extension
    dnl for STORE_TESTS substition
    dnl
    STORE_TESTS="$STORE_TESTS tests/testUfs$EXEEXT"
fi

AH_TEMPLATE(HAVE_FS_UFS, "Define to 1 if ufs filesystem module is build")
AH_TEMPLATE(HAVE_FS_AUFS, "Define to 1 if aufs filesystem module is build")
AH_TEMPLATE(HAVE_FS_DISKD, "Define to 1 if diskd filesystem module is build")
AH_TEMPLATE(HAVE_FS_COSS, "Define to 1 if coss filesystem module is build")


dnl got final STORE_MODULES, build library lists
dnl This list will not be needed when each fs library has its own Makefile
STORE_LIBS_TO_BUILD=
dnl File system libraries to link executables with.
dnl These are the same as STORE_LIBS_TO_BUILD, but with a path
STORE_LIBS_TO_ADD=
for fs in $STORE_MODULES; do
    STORE_LIBS_TO_BUILD="$STORE_LIBS_TO_BUILD lib${fs}.la"
    STORE_LIBS_TO_ADD="$STORE_LIBS_TO_ADD fs/lib${fs}.la"
    HAVE_FS_TYPE=HAVE_FS_`echo $fs | sed 'y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/'` 
    AC_DEFINE_UNQUOTED($HAVE_FS_TYPE, 1)
done

AC_SUBST(STORE_LIBS_TO_BUILD)
AC_SUBST(STORE_LIBS_TO_ADD)
AC_SUBST(STORE_TESTS)


dnl At lest one removal policy is always needed.
dnl 'lru' removal policy is currently hard-coded by name for tests
dnl so we must set it as default.
REPL_POLICIES="lru"
AC_ARG_ENABLE(removal-policies,
  AS_HELP_STRING([--enable-removal-policies="list of policies"],[Build support for the list of removal policies.
                  The default is only to build the "lru" module.
                  See src/repl for a list of available modules, or
                  Programmers Guide section 9.9 for details on how
                  to build your custom policy]),
[ case $enableval in
  yes)
	for dir in $srcdir/src/repl/*; do
	    module="`basename $dir`"
	    if test -d "$dir" && test "$module" != CVS && test "$module" != "lru"; then
		REPL_POLICIES="$REPL_POLICIES $module"
	    fi
	done
  	;;
  no)
  	;;
  *)
 	REPL_POLICIES="`echo $enableval| sed -e 's/,/ /g;s/  */ /g'`"
	;;
  esac
])
if test -n "$REPL_POLICIES"; then
    for module in $REPL_POLICIES; do
	if test -d $srcdir/src/repl/$module; then
	    :
	else
	    AC_MSG_ERROR(Removal policy $module does not exist)
	fi
    done
    AC_MSG_NOTICE([Removal policies built: $REPL_POLICIES])
    REPL_OBJS="repl/lib`echo $REPL_POLICIES|sed -e 's% %.a repl/lib%g'`.a"
    REPL_LIBS="`echo $REPL_OBJS|sed -e 's%repl/%%g'`"
fi
AC_SUBST(REPL_POLICIES)
AC_SUBST(REPL_OBJS)
AC_SUBST(REPL_LIBS)

AM_CONDITIONAL(ENABLE_PINGER, false)
AC_ARG_ENABLE(icmp,
  AS_HELP_STRING([--enable-icmp],[Enable ICMP pinging and Network Measurement]),
[ if test "$enableval" = "yes" ; then
    AC_MSG_NOTICE([ICMP enabled])
    AC_DEFINE(USE_ICMP,1,[Define to use Squid's ICMP and Network Measurement features (highly recommended!)])
    AM_CONDITIONAL(ENABLE_PINGER, true)
  fi
])

AM_CONDITIONAL(USE_DELAY_POOLS, false)
AC_ARG_ENABLE(delay-pools,
  AS_HELP_STRING([--enable-delay-pools],[Enable delay pools to limit bandwidth usage]),
[ if test "$enableval" = "yes" ; then
    AC_MSG_NOTICE([Delay pools enabled])
    AC_DEFINE([DELAY_POOLS],1,[Traffic management via "delay pools".])
    AM_CONDITIONAL(USE_DELAY_POOLS, true,)
  fi
])

dnl disable generic/common adaptation support by default
use_adaptation=no

use_esi=yes
AC_ARG_ENABLE(esi,
  AS_HELP_STRING([--enable-esi],[Enable ESI for accelerators. Benefits from libexpat or libxml2.
                  Enabling ESI will cause squid reverse proxies to be capable of the
                  Edge Acceleration Specification (www.esi.org).]),
	      use_esi=$enableval, use_esi=no)
HAVE_LIBEXPAT=0
EXPATLIB=
HAVE_LIBXML2=0
XMLLIB=
if test "$use_esi" = "yes" ; then
  AC_MSG_NOTICE([Enabling ESI processor and Surrogate header support.])
  AC_DEFINE(USE_SQUID_ESI,1,[Compile the ESI processor and Surrogate header support])

  AC_ARG_WITH(expat, AS_HELP_STRING([--without-libexpat],[Do not use libexpat for ESI. Default: auto-detect]))
  if test "$with_expat" != "no" ; then
    AC_CHECK_LIB([expat], [main], [EXPATLIB="-lexpat"; HAVE_LIBEXPAT=1])
    AC_CHECK_HEADERS([expat.h])
    AC_DEFINE_UNQUOTED(HAVE_LIBEXPAT, $HAVE_LIBEXPAT, [Define to 1 if you have the expat library])
    if test "$with_expat" = "yes" && test "$HAVE_LIBEXPAT" != "1" ; then
      AC_MSG_ERROR([Required library libexpat is not able to be found.])
    fi
  fi

  AC_ARG_WITH(xml2, AS_HELP_STRING([--without-libxml2],[Do not use libxml2 for ESI. Default: auto-detect]))
  if test "$with_xml2" != "no" ; then
    AC_CHECK_LIB([xml2], [main], [XMLLIB="-lxml2"; HAVE_LIBXML2=1])
    dnl Find the main header and include path...
    AC_CHECK_HEADERS([libxml/parser.h], [], [
        SAVED_CPPFLAGS="$CPPFLAGS"
        CPPFLAGS="-I/usr/include/libxml2 $CPPFLAGS"
        unset ac_cv_header_libxml_parser_h
        AC_CHECK_HEADERS([libxml/parser.h], [ac_cv_libxml2_include=yes], [])
        CPPFLAGS="$SAVED_CPPFLAGS"
        ])
    if test "x$ac_cv_libxml2_include" = "xyes"; then
        SQUID_CXXFLAGS="-I/usr/include/libxml2 $SQUID_CXXFLAGS"
        CPPFLAGS="-I/usr/include/libxml2 $CPPFLAGS"
    fi
    dnl Now that we know where to look find the other headers...
    AC_CHECK_HEADERS(libxml/HTMLparser.h libxml/HTMLtree.h)
    AC_DEFINE_UNQUOTED(HAVE_LIBXML2, $HAVE_LIBXML2, [Define to 1 if you have the libxml2 library])
    if test "$with_xml2" = "yes" && test "$HAVE_LIBXML2" != "1" ; then
      AC_MSG_ERROR([Required library libxml2 is not able to be found.])
    fi
  fi

else
  AC_MSG_NOTICE([Disabling ESI processor and Surrogate header support.])
fi
AM_CONDITIONAL(USE_ESI, test "$use_esi" = "yes")
AM_CONDITIONAL(HAVE_LIBEXPAT, test $HAVE_LIBEXPAT = 1)
AC_SUBST(EXPATLIB)
AM_CONDITIONAL(HAVE_LIBXML2, test $HAVE_LIBXML2 = 1)
AC_SUBST(XMLLIB)

AM_CONDITIONAL(USE_ICAP_CLIENT, false)
AC_ARG_ENABLE(icap-client,
  AS_HELP_STRING([--enable-icap-client],[Enable the ICAP client.]),
	      use_icap_client=$enableval, use_icap_client=no)
if test "$use_icap_client" = "yes" ; then
  AC_DEFINE(ICAP_CLIENT,1,[Enable ICAP client features in Squid])
  AM_CONDITIONAL(USE_ICAP_CLIENT, true)
  ICAP_LIBS="icap/libicap.la"
  use_adaptation=yes
else
  AC_DEFINE(ICAP_CLIENT,0,[Enable ICAP client features in Squid])
  ICAP_LIBS=""
fi
AC_SUBST(ICAP_LIBS)

use_ecap=1
AC_MSG_CHECKING(whether to support eCAP)
AC_ARG_ENABLE(ecap,
  AS_HELP_STRING([--enable-ecap],[support loadable content adaptation modules]),
    [
        case "${enableval}" in
            yes) use_ecap=yes ;;
            no) use_ecap=no ;;
            *) AC_MSG_ERROR(bad value ${enableval} for --enable-ecap) ;;
        esac
        AC_MSG_RESULT([$use_ecap, explicitly])
    ],
    [
        use_ecap=no;
        AC_MSG_RESULT([$use_ecap, implicitly])
    ]
)

dnl Perform configuration consistency checks for eCAP
ECAPLIB=""
if test $use_ecap = yes;
then
    dnl eCAP support requires loadable modules, which are enabled by default
    if test "$use_loadable_modules" != "yes"
    then
        AC_MSG_ERROR([eCAP support requires loadable modules. Please do not use --disable-loadable-modules with --enable-ecap.]);
    fi

    dnl eCAP support requires libecap
    AC_CHECK_LIB([ecap], [main],
        [ECAPLIB="-lecap"],
        [AC_MSG_FAILURE([eCAP support requires libecap library, but no usable library was found])]
    )
fi

AM_CONDITIONAL(USE_ECAP, test $use_ecap = yes)
if test $use_ecap = yes;
then
    AC_DEFINE(USE_ECAP,1,[Enable eCAP support])
    ECAP_LIBS="ecap/libecap.la $ECAP_LIBS"
    use_adaptation=yes
else
    AC_DEFINE(USE_ECAP,0,[Disable eCAP support])
    ECAP_LIBS=""
fi
dnl convenience library
AC_SUBST(ECAP_LIBS)
dnl -lecap if needed
AC_SUBST(ECAPLIB)


dnl enable adaptation if requested by specific adaptation mechanisms
AM_CONDITIONAL(USE_ADAPTATION, test $use_adaptation = yes)
if test $use_adaptation = yes
then
    AC_DEFINE(USE_ADAPTATION,1,[common adaptation support])
    ADAPTATION_LIBS="adaptation/libadaptation.la"
else
    AC_DEFINE(USE_ADAPTATION,0,[common adaptation support])
    ADAPTATION_LIBS=""
fi
AC_SUBST(ADAPTATION_LIBS)


dnl This is a developer only option. Developers know how to set defines
dnl
dnl AC_ARG_ENABLE(mem-gen-trace,
dnl [  --enable-mem-gen-trace  Do trace of memory stuff],
dnl [ if test "$enableval" = "yes" ; then
dnl     AC_MSG_NOTICE([Memory trace (to file) enabled])
dnl     AC_DEFINE(MEM_GEN_TRACE,1,[Define for log file trace of mem alloc/free])
dnl   fi    
dnl ])     

AC_ARG_ENABLE(useragent-log,
  AS_HELP_STRING([--enable-useragent-log],[Enable logging of User-Agent header]),
[ if test "$enableval" = "yes" ; then
    AC_MSG_NOTICE([User-Agent logging enabled])
    AC_DEFINE(USE_USERAGENT_LOG,1,[If you want to log User-Agent request header values, define this.
    By default, they are written to useragent.log in the Squid log
    directory.])
  fi
])

AC_ARG_ENABLE(referer-log,
  AS_HELP_STRING([--enable-referer-log],[Enable logging of Referer header]),
[ if test "$enableval" = "yes" ; then
    AC_MSG_NOTICE([Referer logging enabled])
    AC_DEFINE(USE_REFERER_LOG,1,[If you want to log Referer request header values, define this.
    By default, they are written to referer.log in the Squid log
    directory.])
  fi
])

USE_WCCP=1
AC_ARG_ENABLE(wccp,  
  AS_HELP_STRING([--disable-wccp],[Disable Web Cache Coordination Protocol]),
[ if test "$enableval" = "no" ; then
    AC_MSG_NOTICE([Web Cache Coordination Protocol disabled])
    USE_WCCP=0
  fi
])      
if test $USE_WCCP = 1; then
    AC_DEFINE(USE_WCCP, 1, [Define to enable WCCP])
fi

USE_WCCPv2=1
AC_ARG_ENABLE(wccpv2,
  AS_HELP_STRING([--disable-wccpv2],[Disable Web Cache Coordination V2 Protocol]),
[ if test "$enableval" = "no" ; then
    AC_MSG_NOTICE(["Web Cache Coordination V2 Protocol disabled])
    USE_WCCPv2=0
  fi
])
if test $USE_WCCPv2 = 1; then
    AC_DEFINE(USE_WCCPv2, 1, [Define to enable WCCP V2])
fi

AC_ARG_ENABLE(kill-parent-hack,
  AS_HELP_STRING([--enable-kill-parent-hack],[Kill parent on shutdown]),
[ if test "$enableval" = "yes" ; then
    AC_MSG_NOTICE([Kill parent on shutdown])
    AC_DEFINE(KILL_PARENT_OPT,1,[A dangerous feature which causes Squid to kill its parent process
    (presumably the RunCache script) upon receipt of SIGTERM or SIGINT.
    Use with caution.])
  fi
])

USE_SNMP=true
AC_ARG_ENABLE(snmp,
  AS_HELP_STRING([--disable-snmp],[Disable SNMP monitoring support]),
[ if test "$enableval" = "no" ; then
    AC_MSG_NOTICE([SNMP monitoring disabled])
    USE_SNMP=
  fi
])
if test x"$USE_SNMP" = xtrue; then
    AC_DEFINE(SQUID_SNMP,1,[Define to enable SNMP monitoring of Squid])
    SNMPLIB='../snmplib/libsnmp.a'
    makesnmplib=snmplib
fi
AM_CONDITIONAL(USE_SNMP, [test x$USE_SNMP = xtrue])
AC_SUBST(SNMPLIB)
AC_SUBST(makesnmplib)

AC_ARG_ENABLE(cachemgr-hostname,
  AS_HELP_STRING([--enable-cachemgr-hostname=hostname],[Make cachemgr.cgi default to this host.
                  If unspecified, uses the name of the build-host]),
[  case $enableval in
   yes)
       AC_DEFINE(CACHEMGR_HOSTNAME,[getfullhostname()],
       [If you are upset that the cachemgr.cgi form comes up with the hostname field blank, then define this to getfullhostname()])
       AC_MSG_NOTICE([Cachemgr default hostname == host where cachemgr runs])
       ;;
   no)
       : # Nothing to do..
       ;;
   *)
       AC_DEFINE_UNQUOTED(CACHEMGR_HOSTNAME,"${enableval}")
       AC_MSG_NOTICE([Cachemgr default hostname set to ${enableval}])
       ;;
   esac
])

AM_CONDITIONAL(USE_SQUID_EUI, false)
AC_ARG_ENABLE(eui,
  AS_HELP_STRING([--enable-eui],[Enable use of ARP / MAC/ EUI (ether address)]),
[  if test "$enableval" = "yes" ; then
     AC_MSG_NOTICE([EUI controls enabled (ether address)])
     case "$host" in
	*-linux-*)
	    ;;
	*-solaris*)
	    ;;
	*-freebsd*)
	    ;;
	*-openbsd*)
	    ;;
	*-netbsd*)
	    ;;
	*-cygwin*)
		EUILIB="-liphlpapi"
	    ;;
	*-mingw*)
		EUILIB="-liphlpapi"
	    ;;
	*)
	    AC_MSG_WARN([EUI support probably won't work on $host.])
	    sleep 10
	    ;;
     esac
     AC_CHECK_HEADERS( \
		Iphlpapi.h \
		net/if.h \
		net/if_arp.h \
		net/if_dl.h \
		net/route.h \
		netinet/if_ether.h \
		sys/sockio.h \
		sys/sysctl.h \
		sys/ioctl.h \
	)
     AC_DEFINE(USE_SQUID_EUI,1,[Define this to include code which lets you use ethernet hardware addresses.  This code uses functions found in 4.4 BSD derviations (e.g. FreeBSD, ?).])
     AM_CONDITIONAL(USE_SQUID_EUI, true)
   fi
])

USE_HTCP=true
AM_CONDITIONAL(ENABLE_HTCP, false)
AC_ARG_ENABLE(htcp,
  AS_HELP_STRING([--disable-htcp],[Disable HTCP protocol support]),
[ if test "$enableval" = "no" ; then
    AC_MSG_NOTICE([HTCP support disabled])
  fi
])
if test x$USE_HTCP = xtrue; then
    AC_DEFINE(USE_HTCP,1, [Define this to include code for the Hypertext Cache Protocol (HTCP)])
fi
AM_CONDITIONAL(ENABLE_HTCP, [test x$USE_HTCP = xtrue])

dnl SSL is not enabled by default.
AM_CONDITIONAL(ENABLE_SSL, false)

dnl Default is to use OpenSSL when available
AC_ARG_ENABLE(ssl,
  AS_HELP_STRING([--enable-ssl],[Enable ssl gatewaying support using OpenSSL]),
[ if test "$enableval" != "no"; then
    AC_MSG_NOTICE([SSL gatewaying using OpenSSL enabled])
    AC_DEFINE(USE_SSL,1,[Define this to include code for SSL encryption.])
    AM_CONDITIONAL(ENABLE_SSL, true)
    case "$host_os" in
    mingw|mingw32)
        dnl Native Windows port of OpenSSL needs -lgdi32
        SSLLIB='-lssleay32 -leay32 -lgdi32'
        ;;
    *)
        SSLLIB='-lssl -lcrypto'
	;;
    esac
    USE_OPENSSL=1
  fi
])

dnl User may specify OpenSSL is needed from a non-standard location
AC_ARG_WITH(openssl,
  AS_HELP_STRING([--with-openssl{=PATH}],[Compile with the OpenSSL libraries. The path to
                  the OpenSSL development libraries and headers
                  installation can be specified if outside of the
                  system standard directories]),
[ 
  case "$with_openssl" in
  yes)
    USE_OPENSSL=1
    ;;
  no)
    USE_OPENSSL=
    ;;
  *)
    SSLLIBDIR="$with_openssl/lib"
    CPPFLAGS="-I$with_openssl/include $CPPFLAGS"
    USE_OPENSSL=1
  esac
])
if test -n "$USE_OPENSSL"; then
  AC_MSG_NOTICE([Using OpenSSL MD5 implementation])
  AC_DEFINE(USE_OPENSSL,1,[Define this to make use of the OpenSSL libraries for MD5 calculation rather than Squid's own MD5 implementation or if building with SSL encryption (USE_SSL)])
  if test -z "$SSLLIB"; then
    SSLLIB="-lcrypto" # for MD5 routines
  fi
  dnl This is a workaround for RedHat 9 brain damage..
  if test -d /usr/kerberos/include && test -z "$SSLLIBDIR" && test -f /usr/include/openssl/kssl.h; then
    AC_MSG_NOTICE([OpenSSL depends on Kerberos])
    SSLLIBDIR="/usr/kerberos/lib"
    CPPFLAGS="$CPPFLAGS -I/usr/kerberos/include"
  fi
fi
if test -n "$SSLLIBDIR"; then
  SSLLIB="-L$SSLLIBDIR $SSLLIB"
fi
AC_SUBST(SSLLIB)


AC_ARG_ENABLE(forw-via-db,
  AS_HELP_STRING([--enable-forw-via-db],[Enable Forw/Via database]),
[ if test "$enableval" = "yes" ; then
    AC_MSG_NOTICE([FORW-VIA enabled])
    AC_DEFINE(FORW_VIA_DB,1,[Enable Forw/Via database])
  fi
])

AC_ARG_ENABLE(cache-digests,
  AS_HELP_STRING([--enable-cache-digests],[Use Cache Digests.
                  See http://wiki.squid-cache.org/SquidFaq/CacheDigests]),
[ if test "$enableval" = "yes" ; then
    AC_MSG_NOTICE([Cache Disgests enabled])
    AC_DEFINE(USE_CACHE_DIGESTS,1,[Use Cache Digests for locating objects in neighbor caches.  This code is still semi-experimental.])
  fi
])

dnl Size of COSS memory buffer
AC_ARG_WITH(coss-membuf-size,
  AS_HELP_STRING([--with-coss-membuf-size=size],[COSS membuf size (default 1048576 bytes)]),
[  if test -n "$withval" -a "x$withval" != "xno" ; then
      AC_MSG_NOTICE([Setting COSS membuf size to $with_coss_membuf_size bytes])
      AC_DEFINE_UNQUOTED(COSS_MEMBUF_SZ, $with_coss_membuf_size,[Define if you want to set the COSS membuf size])
   fi
])

dnl check for netio plugin stuff

dnl Enable poll()
disable_poll=
AC_ARG_ENABLE(poll,
  AS_HELP_STRING([--disable-poll],[Disable poll(2) support.]),
[
  case "$enableval" in
  yes)
    AC_MSG_WARN([Forcing poll() to be enabled])
    SELECT_TYPE="poll"
    ;;
  no)
    AC_MSG_WARN([Forcing poll() to be disabled])
    disable_poll=true
    ;;
  esac
])

dnl Enable select()
disable_select=
AC_ARG_ENABLE(select,
  AS_HELP_STRING([--disable-select],[Disable select(2) support.]),
[
  case "$enableval" in
  yes)
    AC_MSG_WARN([Forcing select() to be enabled])
    SELECT_TYPE="select"
    ;;
  no)
    AC_MSG_WARN([Forcing select() to be disabled])
    disable_select=true
    ;;
  esac
])

dnl Enable kqueue()
dnl kqueue support is still experiemntal and unstable. Not enabled by default.
disable_kqueue=true
AC_ARG_ENABLE(kqueue,
  AS_HELP_STRING([--enable-kqueue],[Enable kqueue(2) support (experimental).]),
[
  case "$enableval" in
  yes)
    AC_MSG_WARN([Forcing kqueue() to be enabled])
    SELECT_TYPE="kqueue"
    AC_CHECK_HEADERS([sys/event.h],[],
      [ AC_MSG_ERROR([kqueue support requires sys/event.h header file.]) ])
    ;;
  no)
    AC_MSG_WARN([Forcing kqueue() to be disabled])
    disable_kqueue=true
  ;;
  *)
    AC_CHECK_HEADERS([sys/event.h])
  ;;
esac
])

dnl Enable epoll()
disable_epoll=
force_epoll="no"
AC_ARG_ENABLE(epoll,
  AS_HELP_STRING([--disable-epoll],[Disable Linux epoll(2) support.]),
[
  case "$enableval" in
  yes)
    AC_MSG_WARN([Forcing epoll() to be enabled])
    SELECT_TYPE="epoll"
    force_epoll="yes"
    ;;
  no)
    AC_MSG_WARN([Forcing epoll() to be disabled])
    disable_epoll=true
  ;;
esac
])
dnl auto-detect and verify epoll header and library present and working
if test -z "$disable_epoll"; then

  # Check for libepoll
  EPOLL_LIB=
  AC_CHECK_LIB(epoll, epoll_ctl, [EPOLL_LIBS="-lepoll"])
  AC_SUBST(EPOLL_LIBS)

  dnl on some systems it is provided by libc
  dnl not to worry, the working test below will catch them
  dnl and we don't want to force additional libraries


  # Check for epoll_ctl, may need -lepoll
  SAVED_LIBS="$LIBS"
  LIBS="$LIBS $EPOLL_LIBS"
  AC_CHECK_FUNCS(epoll_ctl)
  LIBS="$SAVED_LIBS"

  dnl epoll requires sys/epoll.h
  AC_CHECK_HEADERS([sys/epoll.h])

  dnl Verify that epoll really works
  if test $ac_cv_func_epoll_ctl = yes; then
    AC_CACHE_CHECK(if epoll works, ac_cv_epoll_works,
      AC_RUN_IFELSE([AC_LANG_SOURCE([[
#include <sys/epoll.h>
#include <stdlib.h>
#include <stdio.h>
int main(int argc, char **argv)
{
    int fd = epoll_create(256);
    if (fd < 0) {
	perror("epoll_create:");
	return 1;
    }
    return 0;
}
      ]])],[ac_cv_epoll_works=yes],[ac_cv_epoll_works=no],[]))
  fi

  if test "$force_epoll" = "yes" && test "$ac_cv_epoll_works" = "no" ; then
    AC_MSG_ERROR([Epoll does not work. Force-enabling it is not going to help.])
  fi
fi

dnl Disable HTTP violations
http_violations=1
AC_ARG_ENABLE(http-violations,
  AS_HELP_STRING([--disable-http-violations],[This allows you to remove code which is known to
                  violate the HTTP protocol specification.]),
[ if test "$enableval" = "no" ; then
    AC_MSG_NOTICE([Disabling HTTP Violations])
    http_violations=0
  fi
])
if test $http_violations = 1; then
    AC_DEFINE(HTTP_VIOLATIONS, 1,[By default (for now anyway) Squid includes options which allows the cache administrator to violate the HTTP protocol specification in terms of cache behaviour.  Setting this to '0' will disable such code.])
else
    AC_DEFINE(HTTP_VIOLATIONS, 0)
fi

dnl Enable IPFW Transparent Proxy
AC_ARG_ENABLE(ipfw-transparent,
  AS_HELP_STRING([--enable-ipfw-transparent],[Enable Transparent Proxy support for systems
                  using FreeBSD IPFW style redirection.]),
[ if test "$enableval" = "yes" ; then
	AC_MSG_NOTICE([IPFW Transparent Proxy enabled])
	AC_DEFINE(IPFW_TRANSPARENT,1,[Enable support for Transparent Proxy on systems using FreeBSD IPFW address redirection.])
	IPFW_TRANSPARENT="yes"
  else
	AC_DEFINE(IPFW_TRANSPARENT,0,[Enable support for Transparent Proxy on systems using FreeBSD IPFW address redirection.])
  fi
])

dnl Enable IP-Filter Transparent Proxy
AC_ARG_ENABLE(ipf-transparent,
  AS_HELP_STRING([--enable-ipf-transparent],[Enable Transparent Proxy support for systems
                  using IP-Filter network address redirection.]),
[ if test "$enableval" = "yes" ; then
	AC_MSG_NOTICE([IP-Filter Transparent Proxy enabled])
	AC_DEFINE(IPF_TRANSPARENT,1,[Enable support for Transparent Proxy on systems using IP-Filter address redirection. This provides "masquerading" support for non Linux system.])
	IPF_TRANSPARENT="yes"
  else
	AC_DEFINE(IPF_TRANSPARENT,0,[Enable support for Transparent Proxy on systems using IP-Filter address redirection. This provides "masquerading" support for non Linux system.])
  fi
])

dnl Enable PF Transparent Proxy
AC_ARG_ENABLE(pf-transparent,
  AS_HELP_STRING([--enable-pf-transparent],[Enable Transparent Proxy support for systems
                  using PF network address redirection.]),
[ if test "$enableval" = "yes" ; then
	AC_MSG_NOTICE([PF Transparent Proxy enabled])
	AC_DEFINE(PF_TRANSPARENT,1,[Enable support for Transparent Proxy on systems using PF address redirection. This provides "masquerading" support for OpenBSD.])
	PF_TRANSPARENT="yes"
  else
	AC_DEFINE(PF_TRANSPARENT,0,[Enable support for Transparent Proxy on systems using PF address redirection. This provides "masquerading" support for OpenBSD.])
  fi
])

dnl Enable Linux Netfilter Transparent Proxy
AC_ARG_ENABLE(linux-netfilter,
  AS_HELP_STRING([--enable-linux-netfilter],[Enable Transparent Proxy support for Linux (Netfilter)]),
[ if test "$enableval" = "yes" ; then
	AC_MSG_NOTICE([Linux (Netfilter) Transparent Proxy enabled])
	AC_DEFINE(LINUX_NETFILTER,1,[Enable support for Transparent Proxy on Linux (Netfilter) systems])
	LINUX_NETFILTER="yes"
  else
	AC_DEFINE(LINUX_NETFILTER,0,[Enable support for Transparent Proxy on Linux (Netfilter) systems])
  fi
])

dnl Enable Large file support
buildmodel=""
needlargefiles=

AC_ARG_WITH(large-files,
  AS_HELP_STRING([--with-large-files],[Enable support for large files (logs etc).]),
[ if test "x$withval" = "xyes"; then
	needlargefiles=1
  fi
])

dnl UNIX Build environment
dnl AS_HELP_STRING is not suited here because it doesn't allow to specify newlines
AC_ARG_WITH(build-environment,
[  --with-build-environment=model
                          The build environment to use. Normally one of
                          POSIX_V6_ILP32_OFF32   32 bits
                          POSIX_V6_ILP32_OFFBIG  32 bits with large file support
                          POSIX_V6_LP64_OFF64    64 bits
                          POSIX_V6_LPBIG_OFFBIG  large pointers and files
                          XBS5_ILP32_OFF32       32 bits (legacy)
                          XBS5_ILP32_OFFBIG      32 bits with large file support (legacy)
                          XBS5_LP64_OFF64        64 bits (legacy)
                          XBS5_LPBIG_OFFBIG      large pointers and files (legacy)
                          default                The default for your OS],
[ case "$withval" in
  yes|no)
	AC_MSG_FAILURE(["--with-build-environment expects a build environment string as used by getconf])
	;;
  *)
	buildmodel="$withval"
	;;
  esac
])

if test $needlargefiles && test -z "$buildmodel"; then
	for model in POSIX_V6_LPBIG_OFFBIG XBS5_LPBIG_OFFBIG POSIX_V6_LP64_OFF64 XBS5_LP64_OFF64 POSIX_V6_ILP32_OFFBIG XBS5_ILP32_OFFBIG; do
		if test "`getconf _$model 2>/dev/null || true`" = 1 || test "`getconf $model 2>/dev/null || true`" ; then
			buildmodel=$model
			break
		fi
	done
	if test -z "$buildmodel"; then
		AC_MSG_WARN(["No suitable build environment found for large files. Trying to use _FILE_OFFSET_BITS=64])
		sleep 1
	fi
fi
case "$buildmodel" in
default|"")
	if test "$needlargefiles"; then
		AC_MSG_NOTICE([Enabling -D_FILE_OFFSET_BITS=64])
		CFLAGS="-D_FILE_OFFSET_BITS=64 $CFLAGS"
		CXXFLAGS="-D_FILE_OFFSET_BITS=64 $CXXFLAGS"
	fi
	;;
*)
	AC_MSG_NOTICE([Using $buildmodel build environment])
	if test "`getconf _$buildmodel 2>/dev/null || true`" = 1 || test "`getconf $buildmodel 2>/dev/null || true`" ; then
	    : # All fine
	else
	    AC_MSG_ERROR(Build environment $buildmodel not known to getconf.)
	fi
	CFLAGS="`getconf ${buildmodel}_CFLAGS` $CFLAGS"
	CXXFLAGS="`getconf ${buildmodel}_CFLAGS` $CXXFLAGS"
	LIBS="`getconf ${buildmodel}_LIBS` $LIBS"
	LDFLAGS="`getconf ${buildmodel}_LDFLAGS` $LDFLAGS"
	case "$host" in
dnl
dnl On Solaris getconf returns for CFLAGS -xarch=generic64, -Xa and -Usun options, and
dnl for LDFLAGS -xarch=generic64, but:
dnl   "-Xa" is supported only by Sun cc, so we need to remove it when using gcc
dnl   For gcc "-xarch=generic64" must be replaced with "-m64"
dnl   The 'sun' define is needed by ipfilter includes, so we must remove "-Usun"
	    *-solaris*)
    		if test "$GCC" = "yes"; then
		    AC_MSG_NOTICE([Removing -Xa for gcc/g++ on $host])
		    CFLAGS="`echo $CFLAGS | sed -e 's/-Xa//'`"
		    CXXFLAGS="`echo $CXXFLAGS | sed -e 's/-Xa//'`"
		    AC_MSG_NOTICE([Replacing -xarch=generic64 with -m64 for gcc/g++ on $host])
		    CFLAGS="`echo $CFLAGS | sed -e 's/-xarch=generic64/-m64/'`"
		    CXXFLAGS="`echo $CXXFLAGS | sed -e 's/-xarch=generic64/-m64/'`"
		    LDFLAGS="`echo $LDFLAGS | sed -e 's/-xarch=generic64//'`"
		fi
		AC_MSG_NOTICE([Removing -Usun on $host])
		CFLAGS="`echo $CFLAGS | sed -e 's/-Usun//'`"
		CXXFLAGS="`echo $CXXFLAGS | sed -e 's/-Usun//'`"
		;;
dnl
dnl On Irix 6.x getconf returns options valid only for the SGI MipsPRO compiler,
dnl so we must adjust something to avoid gcc errors.
dnl On Irix 6.x 32/64 bit we must replace "-n32" with "-mabi=n32" in CFLAGS and
dnl remove "-n32" from LDFLAGS
dnl On Irix 6.x 64 bit we must replace "-64" with "-mabi=64" in CFLAGS and remove
dnl "-64" from LDFLAGS
	    *-sgi-irix6.*)
    		if test "$GCC" = "yes"; then
		    CFLAGS="`echo $CFLAGS | sed -e 's/-n32/-mabi=n32/'`"
		    CXXFLAGS="`echo $CXXFLAGS | sed -e 's/-n32/-mabi=n32/'`"
		    LDFLAGS="`echo $LDFLAGS | sed -e 's/-n32//'`"
		    CFLAGS="`echo $CFLAGS | sed -e 's/-64/-mabi=64/'`"
		    CXXFLAGS="`echo $CXXFLAGS | sed -e 's/-64/-mabi=64/'`"
		    LDFLAGS="`echo $LDFLAGS | sed -e 's/-64//'`"
		fi
		;;
	    *)
	        ;;
	esac
	;;
esac

dnl Enable Linux transparent proxy support for obsolete TPROXY
AC_ARG_ENABLE(linux-tproxy,
  AS_HELP_STRING([--enable-linux-tproxy],[Enable real Transparent Proxy support for Netfilter TPROXY 
                  (version 2).]),
[ if test "$enableval" = "yes" ; then
	AC_MSG_NOTICE([Linux Netfilter/TPROXY v2 enabled])
	AC_DEFINE(LINUX_TPROXY2, 1, [Enable real Transparent Proxy support for Netfilter TPROXY v2.])
	LINUX_TPROXY2="yes"
        if test -z "$LINUX_NETFILTER"; then
	    AC_MSG_NOTICE([Linux-Netfilter Transparent Proxy automatically enabled])
	    LINUX_NETFILTER="yes"
	fi
  else
	AC_DEFINE(LINUX_TPROXY2, 0, [Enable real Transparent Proxy support for Netfilter TPROXY v2.])
  fi
])

AM_CONDITIONAL(MAKE_LEAKFINDER, false)
dnl Enable Leak Finding Functions
AC_ARG_ENABLE(leakfinder,
  AS_HELP_STRING([--enable-leakfinder],[Enable Leak Finding code.  Enabling this alone
                  does nothing; you also have to modify the source
			      code to use the leak finding functions.  Probably
			      Useful for hackers only.]),
[ if test "$enableval" = "yes" ; then
	AC_MSG_NOTICE([Leak-Finding enabled])
	AC_DEFINE(USE_LEAKFINDER,1,[Enable code for assisting in finding memory leaks.  Hacker stuff only.])
	USE_LEAKFINDER="yes"
	AM_CONDITIONAL(MAKE_LEAKFINDER, true)
  fi
])

follow_xff=1
AC_ARG_ENABLE(follow-x-forwarded-for,
  AS_HELP_STRING([--enable-follow-x-forwarded-for],[Enable support for following the X-Forwarded-For
                 HTTP header to try to find the IP address of the
                 original or indirect client when a request has
                 been forwarded through other proxies.]),
[ if test "$enableval" = "yes" ; then
    AC_MSG_NOTICE([follow X-Forwarded-For enabled])
    follow_xff=1
  fi
])
if test $follow_xff = 1; then
    AC_DEFINE(FOLLOW_X_FORWARDED_FOR, 1, [Enable following X-Forwarded-For headers])
else
    AC_DEFINE(FOLLOW_X_FORWARDED_FOR, 0)
fi

use_ident=1
AC_ARG_ENABLE(ident-lookups,
  AS_HELP_STRING([--disable-ident-lookups],[This allows you to remove code that performs Ident (RFC 931) lookups.]),
[ if test "$enableval" = "no" ; then
    AC_MSG_NOTICE([Disabling Ident Lookups])
    use_ident=0
  fi
])
if test $use_ident = 1; then
    AC_DEFINE(USE_IDENT, 1,[Compile in support for Ident (RFC 931) lookups?  Enabled by default.])
else
    AC_DEFINE(USE_IDENT, 0)
fi

AM_CONDITIONAL(USE_DNSSERVER, false)
use_dnsserver=
AC_ARG_ENABLE(internal-dns,
  AS_HELP_STRING([--disable-internal-dns],[Prevents Squid from directly sending and receiving DNS messages, 
                  and instead enables the old external 'dnsserver' processes.]),
[ if test "$enableval" = "no" ; then
    AC_MSG_WARN([Disabling Internal DNS queries])
    use_dnsserver="yes"
  fi
])
if test "$use_dnsserver" = "yes"; then
    AC_DEFINE(USE_DNSSERVERS,1,[Use dnsserver processes instead of the internal DNS protocol support])
    AM_CONDITIONAL(USE_DNSSERVER, true)
fi

dnl Select Default hosts file location
AC_ARG_ENABLE(default-hostsfile,
  AS_HELP_STRING([--enable-default-hostsfile=path],[Select default location for hosts file.
                  See hosts_file directive in squid.conf for details]),
[
    if test "$enableval" != "none" ; then
    	if test -f $enableval; then
	    OPT_DEFAULT_HOSTS=$enableval
    	else
	    AC_MSG_WARN([Unable to find $enableval])
	    sleep 5
	fi
    else
	OPT_DEFAULT_HOSTS="none"
    fi
    AC_MSG_NOTICE([Default hosts file set to: $enableval])
],[OPT_DEFAULT_HOSTS="/etc/hosts"])
AC_SUBST(OPT_DEFAULT_HOSTS)

dnl Select auth schemes modules to build
AC_ARG_ENABLE(auth,
  AS_HELP_STRING([--enable-auth="list of auth scheme modules"],[Build support for the list of authentication schemes.
                  The default is to build support for the Basic scheme.
                  See src/auth for a list of available modules, or
                  Programmers Guide section authentication schemes
                  for details on how to build your custom auth scheme
                  module]),
[ case $enableval in
  yes)
        for dir in $srcdir/src/auth/*; do
	    module="`basename $dir`"
            if test -d "$dir" && test "$module" != CVS; then
                AUTH_MODULES="$AUTH_MODULES $module"
            fi
        done
        ;;
  no)
        ;;
  *)
	AUTH_MODULES="`echo $enableval| sed -e 's/,/ /g;s/  */ /g'`"
  	;;
  esac
],
[ if test -z "$AUTH_MODULES"; then
    AUTH_MODULES="ntlm basic digest negotiate"
  fi
])
if test -n "$AUTH_MODULES"; then
    for module in $AUTH_MODULES; do
	if test -d $srcdir/src/auth/$module; then
	    :
	else
	    AC_MSG_ERROR(Auth scheme $module does not exist)
	fi
	eval AUTH_MODULE_${module}=yes
    done
    AC_MSG_NOTICE([Auth scheme modules built: $AUTH_MODULES])
else
    AC_MSG_WARN([Auth scheme modules built: None])
fi
dnl Authentication libraries to build
dnl This list will not be needed when each auth library has its own Makefile
AUTH_LIBS_TO_BUILD=
for module in $AUTH_MODULES; do
    AUTH_LIBS_TO_BUILD="$AUTH_LIBS_TO_BUILD lib${module}.la"
done
AC_SUBST(AUTH_MODULES)
AC_SUBST(AUTH_LIBS_TO_BUILD)

dnl bundled auth modules, in order to have handy defines for the cppunit testsuite
test -n "$AUTH_MODULE_basic" && AC_DEFINE([HAVE_AUTH_MODULE_BASIC],1,[Basic auth module is built])
test -n "$AUTH_MODULE_digest" && AC_DEFINE([HAVE_AUTH_MODULE_DIGEST],1,[Digest auth module is built])
test -n "$AUTH_MODULE_ntlm" && AC_DEFINE([HAVE_AUTH_MODULE_NTLM],1,[NTLM auth module is built])
test -n "$AUTH_MODULE_negotiate" && AC_DEFINE([HAVE_AUTH_MODULE_NEGOTIATE],1,[Negotiate auth module is built])

dnl Select basic auth scheme helpers to build
if test -n "$AUTH_MODULE_basic"; then
	BASIC_AUTH_HELPERS="all"
fi
AC_ARG_ENABLE(basic-auth-helpers,
  AS_HELP_STRING([--enable-basic-auth-helpers="list of helpers"],[This option selects which basic scheme proxy_auth
                  helpers to build and install as part of the normal 
                  build process. For a list of available
                  helpers see the helpers/basic_auth directory.]),
[ case "$enableval" in
  yes)
	BASIC_AUTH_HELPERS="all"
	;;
  no)
	BASIC_AUTH_HELPERS=""
	;;
  *)
	if test -z "$AUTH_MODULE_basic"; then
		AC_MSG_WARN([Basic auth helpers selected without the basic scheme enabled])
		sleep 15
	fi
	BASIC_AUTH_HELPERS="`echo $enableval| sed -e 's/,/ /g;s/  */ /g'`"
	;;
  esac
])
if test "$BASIC_AUTH_HELPERS" = "all" ; then
	BASIC_AUTH_HELPERS=""
	for dir in $srcdir/helpers/basic_auth/*; do
	    helper="`basename $dir`"
	    if test -f $dir/config.test && sh $dir/config.test "$@"; then
		BASIC_AUTH_HELPERS="$BASIC_AUTH_HELPERS $helper"
	    fi
	done
fi
if test -n "$BASIC_AUTH_HELPERS"; then
    for helper in $BASIC_AUTH_HELPERS; do
	if test -d $srcdir/helpers/basic_auth/$helper; then
	    case $helper in
	    SASL)
		    require_sasl=yes
		    ;;
	    esac
	else
	    AC_MSG_ERROR(Basic auth helper $helper does not exist)
	fi
    done
    AC_MSG_NOTICE([Basic auth helpers built: $BASIC_AUTH_HELPERS])
fi
AC_SUBST(BASIC_AUTH_HELPERS)

dnl Select ntlm auth helpers to build
if test -n "$AUTH_MODULE_ntlm"; then
	NTLM_AUTH_HELPERS="all"
fi
AC_ARG_ENABLE(ntlm-auth-helpers,
  AS_HELP_STRING([--enable-ntlm-auth-helpers="list of helpers"],[This option selects which proxy_auth ntlm helpers
                 to build and install as part of the normal build 
                 process. For a list of available helpers see
                 the helpers/ntlm_auth directory.]),
[ case "$enableval" in
  yes) 
	NTLM_AUTH_HELPERS="all"
	;;
  no)
	NTLM_AUTH_HELPERS=""
	;;
  *)
	NTLM_AUTH_HELPERS="`echo $enableval| sed -e 's/,/ /g;s/  */ /g'`"
	;;
  esac
])
if test "$NTLM_AUTH_HELPERS" = "all" ; then
	NTLM_AUTH_HELPERS=""
	for dir in $srcdir/helpers/ntlm_auth/*; do
	    helper="`basename $dir`"
	    if test -f $dir/config.test && sh $dir/config.test "$@"; then
		NTLM_AUTH_HELPERS="$NTLM_AUTH_HELPERS $helper"
	    fi
	done
fi
if test -n "$NTLM_AUTH_HELPERS"; then
    for helper in $NTLM_AUTH_HELPERS; do
	if test -d $srcdir/helpers/ntlm_auth/$helper; then
	    :
	else
	    AC_MSG_ERROR(NTLM Auth helper $helper does not exist)
	fi
    done
    AC_MSG_NOTICE([NTLM auth helpers built: $NTLM_AUTH_HELPERS])
fi
AC_SUBST(NTLM_AUTH_HELPERS)

dnl Select negotiate auth helpers to build
if test -n "$AUTH_MODULE_negotiate"; then
	NEGOTIATE_AUTH_HELPERS="all"
fi
AC_ARG_ENABLE(negotiate-auth-helpers,
  AS_HELP_STRING([--enable-negotiate-auth-helpers="list of helpers"],[This option selects which proxy_auth negotiate helpers
                  to build and install as part of the normal build 
                  process. For a list of available helpers see
                  the helpers/negotiate_auth directory.]),
[ case "$enableval" in
  yes) 
	NEGOTIATE_AUTH_HELPERS="all"
	;;
  no)
	NEGOTIATE_AUTH_HELPERS=""
	;;
  *)
	NEGOTIATE_AUTH_HELPERS="`echo $enableval| sed -e 's/,/ /g;s/  */ /g'`"
	;;
  esac
])
if test "$NEGOTIATE_AUTH_HELPERS" = "all" ; then
	NEGOTIATE_AUTH_HELPERS=""
	for dir in $srcdir/helpers/negotiate_auth/*; do
	    helper="`basename $dir`"
	    if test -f $dir/config.test && sh $dir/config.test "$@";  then
		NEGOTIATE_AUTH_HELPERS="$NEGOTIATE_AUTH_HELPERS $helper"
	    fi
	done
fi
if test -n "$NEGOTIATE_AUTH_HELPERS"; then
    for helper in $NEGOTIATE_AUTH_HELPERS; do
	if test -d $srcdir/helpers/negotiate_auth/$helper; then
	    :
	else
	    AC_MSG_ERROR(Negotiate Auth helper $helper does not exist)
	fi
    done
    AC_MSG_NOTICE([Negotiate auth helpers built: $NEGOTIATE_AUTH_HELPERS])
fi
AC_SUBST(NEGOTIATE_AUTH_HELPERS)
AC_CONFIG_SUBDIRS(helpers/negotiate_auth/squid_kerb_auth)

dnl Select digest auth scheme helpers to build
if test -n "$AUTH_MODULE_digest"; then
	DIGEST_AUTH_HELPERS=all
fi
AC_ARG_ENABLE(digest-auth-helpers,
  AS_HELP_STRING([--enable-digest-auth-helpers="list of helpers"],[This option selects which digest scheme authentication
                  helpers to build and install as part of the normal build
                  process. For a list of available helpers see the
                  helpers/digest_auth directory.]),
[ case "$enableval" in
  yes)
	DIGEST_AUTH_HELPERS="all"
	;;
  no)
	DIGEST_AUTH_HELPERS=""
	;;
  *)
	DIGEST_AUTH_HELPERS="`echo $enableval| sed -e 's/,/ /g;s/  */ /g'`"
	;;
  esac
])
if test "$DIGEST_AUTH_HELPERS" = "all" ; then
	DIGEST_AUTH_HELPERS=""
	for dir in $srcdir/helpers/digest_auth/*; do
	    helper="`basename $dir`"
	    if test -f $dir/config.test && sh $dir/config.test "$@"; then
		DIGEST_AUTH_HELPERS="$DIGEST_AUTH_HELPERS $helper"
	    fi
	done
fi
if test -n "$DIGEST_AUTH_HELPERS"; then
    for helper in $DIGEST_AUTH_HELPERS; do
	if test -f $srcdir/helpers/digest_auth/$helper/Makefile.in; then
		:
	else
		AC_MSG_ERROR(digest auth helper $helper does not exist)
	fi
    done
    AC_MSG_NOTICE([Digest auth helpers built: $DIGEST_AUTH_HELPERS])
fi
AC_SUBST(DIGEST_AUTH_HELPERS)

dnl Check Kerberos
SAVED_CPPFLAGS=$CPPFLAGS
SAVED_LIBS=$LIBS
AC_ARG_WITH(krb5-config,
 [  --with-krb5-config=PATH specify path to krb5-config @<:@default=detect@:>@],
[ if test "$withval" = "yes"; then
     unset krb5confpath
  elif test "$withval" != "no"; then
     krb5confpath=$withval
  else
     krb5confpath=no
  fi
])
if test x"$krb5confpath" != xno; then
    if test x"$krb5confpath" != x; then
        if ! test -x "$krb5confpath"; then
            AC_MSG_WARN([krb5-config '$krb5confpath' not executable, ignoring])
            AC_CHECK_PROG(ac_krb5_config, krb5-config, yes, no)
            krb5confpath=krb5-config
        fi
        krb5_config_path=`dirname $krb5confpath`
        AC_CHECK_PROG(ac_krb5_config, krb5-config, yes, no, $krb5_config_path)
    else
    AC_CHECK_PROG(ac_krb5_config,krb5-config,yes,no)
        krb5confpath=krb5-config
    fi
fi
if test "$ac_krb5_config" = "yes" ; then
    ac_heimdal="`$krb5confpath --version 2>/dev/null | grep -i heimdal`"
    ac_solaris="`$krb5confpath --version 2>/dev/null | grep -i solaris`"
    if test "x$ac_heimdal" != "x" ; then
        AC_DEFINE(HAVE_HEIMDAL_KERBEROS,1,[Define to 1 if you have Heimdal Kerberos])
    else
        AC_DEFINE(HAVE_MIT_KERBEROS,1,[Define to 1 if you have MIT Kerberos])
    fi
    if test "$ac_solaris" != "" ; then
        KRB5INCS="`$krb5confpath --cflags krb5 2>/dev/null`"
        KRB5LIBS="`$krb5confpath --libs krb5 2>/dev/null`"
        KRB5INCS="-I/usr/include/gssapi $KRB5INCS"
        KRB5LIBS="-L/usr/lib -R/usr/lib -lgss -lresolv -lsocket -lnsl $KRB5LIBS"
    else
        KRB5INCS="`$krb5confpath --cflags krb5 2>/dev/null`"
        KRB5LIBS="`$krb5confpath --libs krb5 2>/dev/null`"
        KRB5INCS="`$krb5confpath --cflags gssapi 2>/dev/null` $KRB5INCS"
        KRB5LIBS="`$krb5confpath --libs gssapi 2>/dev/null` $KRB5LIBS"
    fi
    CPPFLAGS="$CPPFLAGS $KRB5INCS"
    LIBS="$LIBS $KRB5LIBS"
    AC_CHECK_HEADERS(gssapi.h gssapi/gssapi.h gssapi/gssapi_krb5.h)
    if test "x$ac_heimdal" == "x" ; then
        AC_CHECK_HEADERS(gssapi/gssapi_generic.h)
    fi
    AC_CHECK_HEADERS(krb5.h com_err.h et/com_err.h)
    AC_MSG_CHECKING([for max_skew in struct krb5_context])
AC_TRY_COMPILE([
#include <krb5.h>
                ],
                [ krb5_context kc; kc->max_skew = 1; ],
                [ AC_DEFINE(HAVE_MAX_SKEW_IN_KRB5_CONTEXT, 1, [Define to 1 if max_skew in struct krb5_context])
                  AC_MSG_RESULT(yes) ],
                [ AC_MSG_RESULT(no) ]
        )

    if test "x$ac_heimdal" == "x" ; then
        AC_CHECK_HEADERS(profile.h)
    fi
    AC_CHECK_LIB(com_err,error_message,
        AC_DEFINE(HAVE_ERROR_MESSAGE,1,[Define to 1 if you have error_message]),)
    AC_CHECK_LIB(krb5,krb5_get_err_text,
        AC_DEFINE(HAVE_KRB5_GET_ERR_TEXT,1,[Define to 1 if you have krb5_get_err_text]),)
    AC_CHECK_LIB(krb5,krb5_get_error_message,
        AC_DEFINE(HAVE_KRB5_GET_ERROR_MESSAGE,1,[Define to 1 if you have krb5_get_error_message]),)
    AC_CHECK_LIB(krb5,krb5_kt_free_entry,
        AC_DEFINE(HAVE_KRB5_KT_FREE_ENTRY,1,[Define to 1 if you have krb5_kt_free_entry]),)
    AC_CHECK_LIB(krb5,krb5_get_init_creds_keytab,
        AC_DEFINE(HAVE_GET_INIT_CREDS_KEYTAB,1,[Define to 1 if you have krb5_get_init_creds_keytab]),)
    AC_CHECK_LIB(krb5,krb5_get_max_time_skew,
        AC_DEFINE(HAVE_KRB5_GET_MAX_TIME_SKEW,1,[Define to 1 if you have krb5_get_max_time_skew]),)
    AC_CHECK_LIB(krb5,krb5_get_profile,
        AC_DEFINE(HAVE_KRB5_GET_PROFILE,1,[Define to 1 if you have krb5_get_profile]),)
    AC_CHECK_LIB(krb5,profile_get_integer,
        AC_DEFINE(HAVE_PROFILE_GET_INTEGER,1,[Define to 1 if you have profile_get_integer]),)
    AC_CHECK_LIB(krb5,profile_release,
        AC_DEFINE(HAVE_PROFILE_RELEASE,1,[Define to 1 if you have profile_release]),)
    AC_MSG_CHECKING([for memory cache])
    AC_TRY_RUN([
#include<krb5.h>
main()
{
    krb5_context context;
    krb5_ccache cc;

    krb5_init_context(&context);
    return krb5_cc_resolve(context, "MEMORY:test_cache", &cc);
}],
    [AC_DEFINE(HAVE_KRB5_MEMORY_CACHE,1, [Define to 1 if you have MEMORY: cache support])
     AC_MSG_RESULT(yes)],
    AC_MSG_RESULT(no))

    AC_MSG_CHECKING([for working gssapi])
    AC_TRY_RUN([
#ifdef HAVE_GSSAPI_GSSAPI_H
#include <gssapi/gssapi.h>
#elif HAVE_GSSAPI_H
#include <gssapi.h>
#endif

#ifdef HAVE_GSSAPI_GSSAPI_EXT_H
#include <gssapi/gssapi_ext.h>
#endif

#ifdef HAVE_GSSAPI_GSSAPI_KRB5_H
#include <gssapi/gssapi_krb5.h>
#endif

#ifdef HAVE_GSSAPI_GSSAPI_GENERIC_H
#include <gssapi/gssapi_generic.h>
#endif
int
main(void)
{
        OM_uint32 val;
        gss_OID_set set;

        gss_create_empty_oid_set(&val, &set);

        return 0;
}
],  [AC_DEFINE(HAVE_GSSAPI, 1, [GSSAPI support])
     AC_MSG_RESULT(yes)],
    AC_MSG_RESULT(no))
    AC_MSG_CHECKING([for spnego support])
    AC_TRY_RUN([
#ifdef HAVE_HEIMDAL_KERBEROS
#ifdef HAVE_GSSAPI_GSSAPI_H
#include <gssapi/gssapi.h>
#elif defined(HAVE_GSSAPI_H)
#include <gssapi.h>
#endif
#else
#ifdef HAVE_GSSAPI_GSSAPI_H
#include <gssapi/gssapi.h>
#elif defined(HAVE_GSSAPI_H)
#include <gssapi.h>
#endif
#ifdef HAVE_GSSAPI_GSSAPI_KRB5_H
#include <gssapi/gssapi_krb5.h>
#endif
#ifdef HAVE_GSSAPI_GSSAPI_GENERIC_H
#include <gssapi/gssapi_generic.h>
#endif
#endif
#include <string.h>
int main(int argc, char *argv[]) {
 OM_uint32 major_status,minor_status;
 gss_OID_set gss_mech_set;
 int i;

static gss_OID_desc _gss_mech_spnego  = {6, (void *)"\x2b\x06\x01\x05\x05\x02"};
gss_OID gss_mech_spnego = &_gss_mech_spnego;

 major_status = gss_indicate_mechs( &minor_status, &gss_mech_set);

 for (i=0;i<gss_mech_set->count;i++) {
     if (!memcmp(gss_mech_set->elements[i].elements,gss_mech_spnego->elements,gss_mech_set->elements[i].length)) {
        return 0;
     }
 }

 return 1;
}],
    [ac_cv_have_spnego=yes
     AC_DEFINE(HAVE_SPNEGO,1, [Define to 1 if you have SPNEGO support])
     AC_MSG_RESULT(yes)],
    [ac_cv_have_spnego=no
     AC_MSG_RESULT(no)])
    AC_MSG_CHECKING([for working krb5])
    AC_TRY_RUN([
#ifdef HAVE_KRB5_H
#include <krb5.h>
#endif

int
main(void)
{
        krb5_context context;

        krb5_init_context(&context);

        return 0;
}
],  [AC_DEFINE(HAVE_KRB5, 1, [KRB5 support])
     AC_MSG_RESULT(yes)],
    AC_MSG_RESULT(no))
   LIBS=$SAVED_LIBS
   CPPFLAGS=$SAVED_CPPFLAGS
   AC_SUBST(KRB5INCS)
   AC_SUBST(KRB5LIBS)
fi
AM_CONDITIONAL(HAVE_SPNEGO, test x"$ac_cv_have_spnego" = x"yes" )

dnl Enable "NTLM fail open"
AC_ARG_ENABLE(ntlm-fail-open,
  AS_HELP_STRING([--enable-ntlm-fail-open],[Enable NTLM fail open, where a helper that fails one of the
                  Authentication steps can allow squid to still authenticate
                  the user.]),
[ if test "$enableval" = "yes" ; then
    AC_DEFINE(NTLM_FAIL_OPEN,1,[Define if NTLM is allowed to fail gracefully when a helper has problems. WARNING: This has security implications. DO NOT enable unless you KNOW you need it.])
  fi
])

dnl Select external_acl helpers to build
EXTERNAL_ACL_HELPERS=all
AC_ARG_ENABLE(external-acl-helpers,
  AS_HELP_STRING([--enable-external-acl-helpers="list of helpers"],[This option selects which external_acl helpers to
                  build and install as part of the normal build
                  process. For a list of available helpers see the
                  helpers/external_acl directory.]),
[ case "$enableval" in
  yes)
	EXTERNAL_ACL_HELPERS=all
	;;
  no)
	EXTERNAL_ACL_HELPERS=""
	;;
  *)
 	EXTERNAL_ACL_HELPERS="`echo $enableval| sed -e 's/,/ /g;s/  */ /g'`"
	;;
  esac
])
if test "$EXTERNAL_ACL_HELPERS" = "all" ; then
	EXTERNAL_ACL_HELPERS=""
	for dir in $srcdir/helpers/external_acl/*; do
	    helper="`basename $dir`"
	    if test -f $dir/config.test && sh $dir/config.test "$@"; then
		EXTERNAL_ACL_HELPERS="$EXTERNAL_ACL_HELPERS $helper"
	    fi
	done
fi
if test -n "$EXTERNAL_ACL_HELPERS"; then
    for helper in $EXTERNAL_ACL_HELPERS; do
	if test -f $srcdir/helpers/external_acl/$helper/Makefile.in; then
		:
	else
		AC_MSG_ERROR(external acl helper $helper does not exist)
	fi
    done
    AC_MSG_NOTICE([External acl helpers built: $EXTERNAL_ACL_HELPERS])
fi
AC_SUBST(EXTERNAL_ACL_HELPERS)

dnl Select url_rewrite helpers to build
URL_REWRITE_HELPERS=all
AC_ARG_ENABLE(url-rewrite-helpers,
  AC_HELP_STRING([--enable-url-rewrite-helpers="list of helpers"],
                 [This option selects which url_rewrite helpers to
                  build and install as part of the normal build
                  process. For a list of available helpers see the
                  helpers/url_rewrite directory.]),
[ case "$enableval" in
  yes)
	URL_REWRITE_HELPERS=all
	;;
  no)
	URL_REWRITE_HELPERS=""
	;;
  *)
 	URL_REWRITE_HELPERS="`echo $enableval| sed -e 's/,/ /g;s/  */ /g'`"
	;;
  esac
])
if test "$URL_REWRITE_HELPERS" = "all" ; then
	URL_REWRITE_HELPERS=""
	for dir in $srcdir/helpers/url_rewrite/*; do
	    helper="`basename $dir`"
	    if test -f $dir/config.test && sh $dir/config.test "$@"; then
		URL_REWRITE_HELPERS="$URL_REWRITE_HELPERS $helper"
	    fi
	done
fi
if test -n "$URL_REWRITE_HELPERS"; then
    for helper in $URL_REWRITE_HELPERS; do
	if test -f $srcdir/helpers/url_rewrite/$helper/Makefile.in; then
		:
	else
		AC_MSG_ERROR(url_rewrite helper $helper does not exist)
	fi
    done
    AC_MSG_NOTICE([url_rewrite helpers built: $URL_REWRITE_HELPERS])
fi
AC_SUBST(URL_REWRITE_HELPERS)


AC_ARG_WITH(valgrind-debug,
  AS_HELP_STRING([--with-valgrind-debug],[Include debug instrumentation for use with valgrind]),
[ case $withval in
  yes)
	valgrind=1
	;;
  no)
	valgrind=
	;;
  *)
	CPPFLAGS="$CPPFLAGS -I${enableval}/include"
	valgrind=1
	;;
  esac
  if test $valgrind; then
    AC_CHECK_HEADERS(valgrind/memcheck.h,
      [ AC_DEFINE(WITH_VALGRIND, 1, [Valgrind memory debugger support])
	AC_MSG_NOTICE([Valgrind debug support enabled]) ],
      [ AC_MSG_WARN([Valgrind header not found. Valgrind support disabled.]) ]
    )
  fi
])

dnl Disable "memPools" code
AC_ARG_ENABLE(mempools,
  AS_HELP_STRING([--disable-mempools],[Disable memPools. Note that this option now simply sets the
			      default behaviour. Specific classes can override this at runtime, and
			      only lib/MemPool.c needs to be altered to change the squid-wide 
			      default for all classes.]),
[ if test "$enableval" = "no" ; then
    AC_MSG_NOTICE([memPools disabled])
    AC_DEFINE(DISABLE_POOLS, 1, [Define if you have problems with memPools and want to disable Pools])
  else
    AC_DEFINE(DISABLE_POOLS, 0, [Define if you have problems with memPools and want to disable Pools.])
  fi
],
[ AC_DEFINE(DISABLE_POOLS, 0, [Define if you have problems with memPools and want to disable Pools.])
])

dnl Enable WIN32 Service compile mode
AC_ARG_ENABLE(win32-service,
  AS_HELP_STRING([--enable-win32-service],[Compile Squid as a WIN32 Service.
                  Works only on MS-Windows platforms (NT and up).]),
[ if test "$enableval" = "yes" ; then
    AC_MSG_NOTICE([Enabling WIN32 run service mode])
    AC_DEFINE(USE_WIN32_SERVICE,1,[Define Windows NT & Windows 2000 run service mode])
  fi
])


dnl Check for Cyrus SASL
if test "$require_sasl" = "yes"; then
	AC_CHECK_HEADERS(sasl/sasl.h sasl.h)
	if test "$ac_cv_header_sasl_sasl_h" = "yes"; then
		AC_MSG_NOTICE([using SASL2])
		LIBSASL="-lsasl2"
	else
		if test "$ac_cv_header_sasl_h" = "yes"; then
			AC_MSG_NOTICE([using SASL])
			LIBSASL="-lsasl"
		else
			AC_MSG_ERROR(Neither SASL nor SASL2 found)
		fi
	fi
	AC_SUBST(LIBSASL)
fi

dnl Disable "unlinkd" code
AC_ARG_ENABLE(unlinkd,
  AS_HELP_STRING([--disable-unlinkd],[Do not use unlinkd]),
[ if test "$enableval" = "no" ; then
    use_unlinkd=no
  else
    use_unlinkd=yes
  fi
],[
    # Here we should probably use some magic depending on the selected
    # storage models
    use_unlinkd=yes
])
if test "$use_unlinkd" = "yes"; then
    AC_MSG_NOTICE([unlinkd enabled])
    AC_DEFINE(USE_UNLINKD,1,[Define this if unlinkd is required (strongly recommended for ufs storage type)])
    AM_CONDITIONAL(ENABLE_UNLINKD, true)
else
    AC_MSG_NOTICE([unlinkd disabled])
    AM_CONDITIONAL(ENABLE_UNLINKD, false)
fi

dnl Enable backtraces on fatal errors
AC_ARG_ENABLE(stacktraces,
  AS_HELP_STRING([--enable-stacktraces],[Enable automatic call backtrace on fatal errors]),
[ if test "$enableval" = "yes" ; then
    AC_MSG_NOTICE([Enabling automatic stack backtraces on fatal errors])
    AC_DEFINE(PRINT_STACK_TRACE, 1,[Print stacktraces on fatal errors])
  fi
])

AM_CONDITIONAL(ENABLE_XPROF_STATS, false)
dnl Enable USE_XPROF_STATS
AC_ARG_ENABLE(cpu-profiling,
  AS_HELP_STRING([--enable-cpu-profiling],[Enable instrumentation to try and understand how CPU power 
                  is spent by squid, by enabling specific probes in selected
                  functions. New probes can only be added by modifying the source code.
                  It is meant to help developers in optimizing performance
                  of Squid internal functions.
                  If you are not developer you shouldn't enable this, 
                  as it slows squid down somewhat. See lib/Profiler.c for more details.]),
[ if test "$enableval" = "yes" ; then
    AC_MSG_NOTICE([Enabling cpu-profiling])
    AC_DEFINE(USE_XPROF_STATS, 1,[Define to enable CPU profiling within Squid])
    AM_CONDITIONAL(ENABLE_XPROF_STATS, true)
  fi
])

dnl Enable X-Accelerator-Vary for Vary support within an accelerator setup
AC_ARG_ENABLE(x-accelerator-vary,
  AS_HELP_STRING([--enable-x-accelerator-vary],[Enable support for the X-Accelerator-Vary
                  HTTP header. Can be used to indicate
                  variance within an accelerator setup.
                  Typically used together with other code
                  that adds custom HTTP headers to the requests.]),
[ if test "$enableval" = "yes" ; then
    AC_MSG_NOTICE([Enabling support for X-Accelerator-Vary])
    AC_DEFINE(X_ACCELERATOR_VARY, 1, [Enable support for the X-Accelerator-Vary HTTP header])
  fi
])

AC_ARG_ENABLE(zph-qos,
  AS_HELP_STRING([--enable-zph-qos],[Enable ZPH QOS support]),
[ if test "$enableval" = "yes" ; then
    AC_MSG_NOTICE([ZPH QOS enabled])
    AC_DEFINE(USE_ZPH_QOS,1,
    [ Define this to use Squid's ZPH (Zero Penalty Hit) QOS features.
      When enabled, Squid will alter TOS field of HIT responses for better QOS on intermediate routing/shaping devices.])
  fi
])

dnl --with-maxfd present for compatibility with Squid-2.
dnl undocumented in ./configure --help  to encourage using the Squid-3 directive.
AC_ARG_WITH(maxfd,,
[ 
  case ${withval} in
    [[0-9]]*)
      squid_filedescriptors_num=$withval
      ;;
    *)
      AC_MSG_ERROR(--with-maxfd expects a numeric argument)
      ;;
    esac
])
AC_ARG_WITH(filedescriptors,
  AS_HELP_STRING([--with-filedescriptors=NUMBER],[Force squid to support NUMBER filedescriptors]),
[ 
  case ${withval} in
    [[0-9]]*)
      squid_filedescriptors_num=$withval
      ;;
    *)
      AC_MSG_ERROR(--with-filedescriptors expects a numeric argument)
      ;;
    esac
])

AC_PATH_PROG(CPPUNITCONFIG, cppunit-config, false)
if $CPPUNITCONFIG --help >/dev/null; then
  AC_MSG_NOTICE([using system installed cppunit])
  SQUID_CPPUNIT_LIBS="`$CPPUNITCONFIG --libs`"
  SQUID_CPPUNIT_LA=''
  SQUID_CPPUNIT_INC="`$CPPUNITCONFIG --cflags`"
else
  AC_MSG_WARN([cppunit does not appear to be installed. squid does not require this, but code testing with 'make check' will fail.])
  SQUID_CPPUNIT_LA='' 
  SQUID_CPPUNIT_LIBS=''
  SQUID_CPPUNIT_INC=''
fi

AC_ARG_WITH(cppunit-basedir,
  AS_HELP_STRING([--with-cppunit-basedir=PATH],[Path where the cppunit headers are libraries are found 
                  for unit testing.]),
[ if test -f $withval/include/cppunit/TestCase.h; then
	AC_MSG_NOTICE([Using cppunit includes from $withval])
	SQUID_CPPUNIT_INC="-I${withval}/include"
    else
	AC_MSG_ERROR(Cannot find cppunit at $withval)
    fi
  if test -f $withval/lib/libcppunit.la; then
	AC_MSG_NOTICE([Using cppunit lib from $withval])
	SQUID_CPPUNIT_LA="${withval}/lib/libcppunit.la"
	SQUID_CPPUNIT_LIBS='$(SQUID_CPPUNIT_LA)'
    else
	AC_MSG_ERROR(Cannot find cppunit at $withval)
    fi
])
AC_SUBST(SQUID_CPPUNIT_LIBS)
AC_SUBST(SQUID_CPPUNIT_LA)
AC_SUBST(SQUID_CPPUNIT_INC)

# Force some compilers to use ANSI features
#
case "$host" in
    alpha-dec-osf*)
	if test "$ac_cv_prog_CC" = "cc" ; then
		AC_MSG_NOTICE([adding '-std1' to cc args for $host])
		CC="cc -std1";
		ac_cv_prog_CC="$CC"
	fi
	;;
    *-hp-hpux*)
	if test "$ac_cv_prog_CC" = "cc" ; then
		AC_MSG_NOTICE([adding '-Ae' to cc args for $host])
		CC="cc -Ae";
		ac_cv_prog_CC="$CC"
	fi
	;;
esac

dnl Check for programs
AC_PROG_CPP
AC_PROG_INSTALL
AC_PROG_LN_S
AC_PATH_PROG(SH, sh, /bin/sh)
AC_PATH_PROG(FALSE, false, /usr/bin/false)
AC_PATH_PROG(TRUE, true, /usr/bin/true)
AC_PATH_PROG(MV, mv, $FALSE)
AC_PATH_PROG(MKDIR, mkdir, $FALSE)
AC_PATH_PROG(LN, ln, cp)

AC_PATH_PROG(RM, rm, $FALSE)
dnl Libtool 2.2.6 requires: rm -f
RM="$RM -f"

dnl automake handles this AC_PATH_PROG(MAKEDEPEND, makedepend, $TRUE)
AC_PROG_EGREP

AC_PATH_PROG(PERL, perl, none)
if test "$ac_cv_path_PERL" = "none"; then
  AC_MSG_FAILURE([Perl is required to compile Squid. Please install Perl and then re-run configure ])
fi

case "$host" in
    *-hp-hpux*)
	AC_MSG_NOTICE([Disabling 'ranlib' for HP-UX...])
	RANLIB=":"
	;;
esac

dnl set $(AR)
AC_PATH_PROG(AR, ar, $FALSE)
AR_R="$AR r"
case "$host" in
	*-next-nextstep3)
		AR="libtool -o"
		;;
esac
AC_SUBST(AR_R)

dnl Check for headers
AC_HEADER_DIRENT
AC_HEADER_STDC

AC_CHECK_HEADERS( \
	arpa/inet.h \
	arpa/nameser.h \
	assert.h \
	bstring.h \
	cassert \
	crypt.h \
	cstring \
	ctype.h \
	errno.h \
	execinfo.h \
	fcntl.h \
	fnmatch.h \
	getopt.h \
	glob.h \
	gnumalloc.h \
	grp.h \
	iosfwd \
	iomanip \
	iostream \
	ip_compat.h \
	ip_fil_compat.h \
	ip_fil.h \
	ip_nat.h \
	ipl.h \
	libc.h \
	limits.h \
	linux/types.h \
	machine/byte_swap.h \
	malloc.h \
	math.h \
	memory.h \
	mount.h \
	netdb.h \
	netinet/in.h \
	netinet/in_systm.h \
	netinet/ip_fil_compat.h \
	openssl/err.h \
	openssl/md5.h \
	openssl/ssl.h \
	netinet/tcp.h \
	openssl/engine.h \
	ostream \
	paths.h \
	poll.h \
	pwd.h \
	shadow.h \
	regex.h \
	sched.h \
	signal.h \
	sstream \
	stdarg.h \
	stddef.h \
	stdexcept \
	stdio.h \
	stdlib.h \
	string \
	string.h \
	strings.h \
	sys/bitypes.h \
	sys/bswap.h \
	sys/endian.h \
	sys/file.h \
	sys/ioctl.h \
	sys/param.h \
	sys/prctl.h \
	sys/md5.h \
	sys/msg.h \
	sys/resource.h \
	sys/select.h\
	sys/socket.h \
	sys/stat.h \
	sys/statvfs.h \
	syscall.h \
	sys/syscall.h \
	sys/time.h \
	sys/types.h \
	sys/un.h \
	sys/vfs.h \
	sys/wait.h \
	syslog.h \
	time.h \
	unistd.h \
	utime.h \
	varargs.h \
	byteswap.h \
	glib.h \
	stdint.h \
	inttypes.h \
	grp.h \
	db.h \
	db_185.h
)

AC_CHECK_HEADERS(
	linux/netfilter_ipv4.h \
	linux/netfilter_ipv4/ip_tproxy.h \
,,,
SQUID_DEFAULT_INCLUDES
#if HAVE_LIMITS_H
#include <limits.h>
#endif
/* Netfilter ip(6)tables v1.4.0 has broken headers */
#if HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
)

dnl *BSD dont include the depenencies for all their net/ and netinet/ files
dnl We must include a few basic type headers for them to work.
AC_CHECK_HEADERS( \
	net/if.h \
	netinet/if_ether.h\
	netinet/icmp6.h \
	netinet/in.h \
	netinet/ip.h \
	netinet/ip6.h \
	netinet/ip_compat.h\
	netinet/ip_fil_compat.h\
	netinet/ip_fil.h\
	netinet/ip_icmp.h \
	netinet/ipl.h \
	netinet/ip_nat.h\
	net/pf/pfvar.h \
	net/pfvar.h \
	sys/mount.h\
	resolv.h \
,,,
SQUID_BSDNET_INCLUDES)

AC_C_CONST
AC_C_BIGENDIAN

AC_STRUCT_TM
AC_CHECK_MEMBERS([struct tm.tm_gmtoff],,,[
#if TM_IN_SYS_TIME
#if HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#elif HAVE_TIME_H
#include <time.h>
#endif
])

AC_CHECK_TYPE(struct mallinfo,AC_DEFINE(HAVE_STRUCT_MALLINFO,1,[The system provides struct mallinfo]),,[
#if HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#if HAVE_MALLOC_H
#include <malloc.h>
#endif])

AC_CHECK_MEMBERS([struct mallinfo.mxfast],,,[
#if HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#if HAVE_MALLOC_H
#include <malloc.h>
#endif])

dnl Override rusage() detect on MinGW because is emulated in source code
case "$host_os" in
  mingw|mingw32)
    AC_DEFINE(HAVE_STRUCT_RUSAGE)
    ac_cv_func_getrusage='yes'
    AC_MSG_NOTICE([Using own rusage on Windows.])
    ;;
  *)      
    AC_CHECK_TYPE(struct rusage,AC_DEFINE(HAVE_STRUCT_RUSAGE,1,[The system provides struct rusage]),,[
#if HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#if HAVE_SYS_RESOURCE_H
#include <sys/resource.h>
#endif])
    ;;
esac

AC_CHECK_MEMBERS([struct iphdr.ip_hl],,,[
#if HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#if defined (__linux__) || defined (__CYGWIN__)
#define ip_hl ihl
#endif
#ifndef __linux__
#ifndef __CYGWIN__
#define iphdr ip
#endif
#endif])

dnl Check for typedefs
AC_CHECK_SIZEOF(void *)

dnl 8 bit integers - int8_t
dnl if this is defined we trust it to be 8 bits
AC_CHECK_TYPE(int8_t,[
  AC_CHECK_SIZEOF(int8_t,,SQUID_DEFAULT_SIZEOF_INCLUDES)
  AC_DEFINE(HAVE_INT8_T,1,[int8_t is defined in system headers])
  ],,SQUID_DEFAULT_INCLUDES)

dnl fallback #1
AC_CHECK_TYPE(char,[
  AC_CHECK_SIZEOF(char,,SQUID_DEFAULT_SIZEOF_INCLUDES)
  AC_DEFINE(HAVE_CHAR,1,[char is defined in system headers])
  ],,SQUID_DEFAULT_INCLUDES)

dnl unsigned 8 bit ints - u_int8_t
dnl if this is defined we trust it to be 8 bits
AC_CHECK_TYPE(u_int8_t,[
  AC_CHECK_SIZEOF(u_int8_t,,SQUID_DEFAULT_SIZEOF_INCLUDES)
  AC_DEFINE(HAVE_U_INT8_T,1,[u_int8_t is defined in system headers])
  ],,SQUID_DEFAULT_INCLUDES)

dnl fallback #1
dnl if this is defined we trust it to be 8 bits
AC_CHECK_TYPE(uint8_t,[
  AC_CHECK_SIZEOF(uint8_t,,SQUID_DEFAULT_SIZEOF_INCLUDES)
  AC_DEFINE(HAVE_UINT8_T,1,[uint8_t is defined in system headers])
  ],,SQUID_DEFAULT_INCLUDES)

dnl 16 bit integers - int16_t
dnl if this is defined we trust it to be 16 bits
AC_CHECK_TYPE(int16_t,[
  AC_CHECK_SIZEOF(int16_t,,SQUID_DEFAULT_SIZEOF_INCLUDES)
  AC_DEFINE(HAVE_INT16_T,1,[int16_t is defined in system headers])
  ],,SQUID_DEFAULT_INCLUDES)

dnl fallback #1
AC_CHECK_TYPE(short,[
  AC_CHECK_SIZEOF(short,,SQUID_DEFAULT_SIZEOF_INCLUDES)
  AC_DEFINE(HAVE_SHORT,1,[short is defined in system headers])
  ],,SQUID_DEFAULT_INCLUDES)

dnl fallback #2
AC_CHECK_TYPE(int,[
  AC_CHECK_SIZEOF(int,,SQUID_DEFAULT_SIZEOF_INCLUDES)
  AC_DEFINE(HAVE_INT,1,[int is defined in system headers])
  ],,SQUID_DEFAULT_INCLUDES)

dnl unsigned 16 bit ints - u_int16_t
dnl if this is defined we trust it to be 16 bits
AC_CHECK_TYPE(u_int16_t,[
  AC_CHECK_SIZEOF(u_int16_t,,SQUID_DEFAULT_SIZEOF_INCLUDES)
  AC_DEFINE(HAVE_U_INT16_T,1,[u_int16_t is defined in system headers])
  ],,SQUID_DEFAULT_INCLUDES)

dnl fallback #1
dnl if this is defined we trust it to be 16 bits
AC_CHECK_TYPE(uint16_t,[
  AC_CHECK_SIZEOF(uint16_t,,SQUID_DEFAULT_SIZEOF_INCLUDES)
  AC_DEFINE(HAVE_UINT16_T,1,[uint16_t is defined in system headers])
  ],,SQUID_DEFAULT_INCLUDES)

dnl 32 bit signed int - int32_t
dnl if this is defined we trust it to be 32 bits
AC_CHECK_TYPE(int32_t,[
  AC_CHECK_SIZEOF(int32_t,,SQUID_DEFAULT_SIZEOF_INCLUDES)
  AC_DEFINE(HAVE_INT32_T,1,[int32_t is defined in system headers])
  ],,SQUID_DEFAULT_INCLUDES)

dnl fallback #1
AC_CHECK_TYPE(long,[
  AC_CHECK_SIZEOF(long,,SQUID_DEFAULT_SIZEOF_INCLUDES)
  AC_DEFINE(HAVE_LONG,1,[long is defined in system headers])
  ],,SQUID_DEFAULT_INCLUDES)

dnl 32 bit unsigned int - u_int32_t
dnl if this is defined we trust it to be 32 bits
AC_CHECK_TYPE(u_int32_t,[
  AC_CHECK_SIZEOF(u_int32_t,,SQUID_DEFAULT_SIZEOF_INCLUDES)
  AC_DEFINE(HAVE_U_INT32_T,1,[u_int32_t is defined in system headers])
  ],,SQUID_DEFAULT_INCLUDES)

dnl fallback #1
dnl if this is defined we trust it to be 32 bits
AC_CHECK_TYPE(uint32_t,[
  AC_CHECK_SIZEOF(uint32_t,,SQUID_DEFAULT_SIZEOF_INCLUDES)
  AC_DEFINE(HAVE_UINT32_T,1,[uint32_t is defined in system headers])
  ],,SQUID_DEFAULT_INCLUDES)

dnl 64 bit signed - int64_t
dnl if this is defind we trust it to be 64 bits
AC_CHECK_TYPE(int64_t,[
  AC_CHECK_SIZEOF(int64_t,,SQUID_DEFAULT_SIZEOF_INCLUDES)
  AC_DEFINE(HAVE_INT64_T,1,[int64_t is defined in system headers])
  ],,SQUID_DEFAULT_INCLUDES)

dnl fallback #1
dnl if this is defind we trust it to be 64 bits
AC_CHECK_TYPE(__int64,[
  AC_CHECK_SIZEOF(__int64,,SQUID_DEFAULT_SIZEOF_INCLUDES)
  AC_DEFINE(HAVE___INT64,1,[__int64 is defined in system headers])
  ],,SQUID_DEFAULT_INCLUDES)

dnl fallback #2
AC_CHECK_TYPE(long long,[
  AC_CHECK_SIZEOF(long long,,SQUID_DEFAULT_SIZEOF_INCLUDES)
  AC_DEFINE(HAVE_LONG_LONG,1,[long long is defined in system headers])
  ],,SQUID_DEFAULT_INCLUDES)

dnl 64 bit unsigned - u_int64_t
dnl if this is defind we trust it to be 64 bits
AC_CHECK_TYPE(u_int64_t,[
  AC_CHECK_SIZEOF(u_int64_t,,SQUID_DEFAULT_SIZEOF_INCLUDES)
  AC_DEFINE(HAVE_U_INT64_T,1,[u_int64_t is defined in system headers])
  ],,SQUID_DEFAULT_INCLUDES)

dnl fallback #1
dnl if this is defind we trust it to be 64 bits
AC_CHECK_TYPE(uint64_t,[
  AC_CHECK_SIZEOF(uint64_t,,SQUID_DEFAULT_SIZEOF_INCLUDES)
  AC_DEFINE(HAVE_UINT64_T,1,[uint64_t is defined in system headers])
  ],,SQUID_DEFAULT_INCLUDES)

dnl On Solaris 9 x86, gcc may includes a "fixed" set of old system include files
dnl that is incompatible with the updated Solaris header files.
dnl For this reason, we must check if pad128_t and upad128_t are defined.
AC_CHECK_TYPE(pad128_t,
  AC_DEFINE(HAVE_PAD128_T,1,[pad128_t is defined in system headers]),
  ,SQUID_DEFAULT_INCLUDES)

AC_CHECK_TYPE(upad128_t,
  AC_DEFINE(HAVE_UPAD128_T,1,[upad128_t is defined in system headers]),
  ,SQUID_DEFAULT_INCLUDES)

AC_CHECK_TYPE(pid_t, AC_DEFINE(HAVE_PID_T,1,[pid_t is defined by the system headers]),,SQUID_DEFAULT_INCLUDES)
AC_CHECK_TYPE(size_t, [AC_CHECK_SIZEOF(size_t,,SQUID_DEFAULT_SIZEOF_INCLUDES)
  AC_DEFINE(HAVE_SIZE_T,1,[size_t is defined by the system headers])],,SQUID_DEFAULT_INCLUDES)
AC_CHECK_TYPE(ssize_t, AC_DEFINE(HAVE_SSIZE_T,1,[ssize_t is defined by the system headers]),,SQUID_DEFAULT_INCLUDES)
AC_CHECK_TYPE(off_t,[ AC_CHECK_SIZEOF(off_t,,SQUID_DEFAULT_SIZEOF_INCLUDES)
  AC_DEFINE(HAVE_OFF_T,1,[off_t is defined by the system headers])],,SQUID_DEFAULT_INCLUDES)
AC_CHECK_TYPE(mode_t, AC_DEFINE(HAVE_MODE_T,1,[mode_t is defined by the system headers]),,SQUID_DEFAULT_INCLUDES)
AC_CHECK_TYPE(fd_mask,  AC_DEFINE(HAVE_FD_MASK,1,[fd_mask is defined by the system headers]),,SQUID_DEFAULT_INCLUDES)

dnl Check for special functions
AC_FUNC_ALLOCA

AC_CHECK_TYPE(socklen_t,AC_DEFINE(HAVE_SOCKLEN_T,1,[socklen_t is defined by the system headers]),,[
#include <sys/types.h>
#include <sys/socket.h>
#if STDC_HEADERS
#include <stdlib.h>
#include <stddef.h>
#endif])

dnl Check for libcap header (assume its not broken unless 
use_libcap=auto
AC_ARG_WITH(libcap, AS_HELP_STRING([--without-libcap],[disable usage of Linux capabilities library to control privileges]),
[ if test "x$withval" = "xyes" ; then
    AC_MSG_RESULT(libcap forced enabled)
    use_libcap=yes
  else
    AC_MSG_RESULT(libcap forced disabled)
    use_libcap=no
  fi
])
if test "x$use_libcap" != "xno"; then
  # cap_clear_flag is the most recent libcap function we require
  AC_CHECK_LIB(cap, cap_clear_flag)
  if test "x$ac_cv_lib_cap_cap_clear_flag" = xyes; then
    use_libcap=yes
  else
    if test "x$use_libcap" = "xyes"; then
      AC_MSG_ERROR([libcap forced enabled but not available or not usable, requires libcap-2.09 or later])
    fi
    use_libcap=no
  fi
fi

if test "x$use_libcap" = "xyes"; then
  AC_DEFINE(USE_LIBCAP, 1, [use libcap to set capabilities required for TPROXY])
  dnl Check for libcap headader breakage.
  AC_CHECK_HEADERS(sys/capability.h)
  AC_CACHE_CHECK([for operational libcap2 headers], squid_cv_sys_capability_works,
    AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#include <stdlib.h>
#include <stddef.h>
#include <sys/capability.h>
]], [[
capget(NULL, NULL);
capset(NULL, NULL);
                   ]])],[squid_cv_sys_capability_works=yes],[squid_cv_sys_capability_works=no])
  )
  if test x$squid_cv_sys_capability_works != xyes; then
    AC_DEFINE([LIBCAP_BROKEN],1,[if libcap2 headers are broken and clashing with glibc])
  fi
fi


AC_CHECK_TYPE(mtyp_t,AC_DEFINE(HAVE_MTYP_T,1,[mtyp_t is defined by the system headers]),,[#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/msg.h>])

dnl Check for needed libraries
AC_CHECK_LIB(nsl, main)
AC_CHECK_LIB(socket, main)
dnl Check for Winsock only on MinGW, on Cygwin we must use emulated BSD socket API
case "$host_os" in
  mingw|mingw32)
    AC_MSG_CHECKING(for winsock)
    save_LIBS="$LIBS"
    for curlib in ws2_32 wsock32; do
	LIBS="$LIBS -l$curlib"
	AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <winsock.h>]], [[
			socket(0,0,0);
			select(0,NULL,NULL,NULL,NULL);
			closesocket(0);
			gethostname(NULL,0);
			]])],[have_winsock=yes],[have_winsock=no])

	if test $have_winsock = yes; then
		ac_cv_func_select='yes'
		if test $curlib = ws2_32; then
			have_winsock=winsock2
		fi
		break
	fi
	LIBS="$save_LIBS"
    done
    AC_MSG_RESULT($have_winsock)
    if test $have_winsock = winsock2; then
       AC_CHECK_HEADERS(winsock2.h)
    else
       AC_CHECK_HEADERS(winsock.h)
    fi
    ;;
esac

dnl Ripped from the Samba sources
AC_CACHE_CHECK([for unix domain sockets],squid_cv_unixsocket, [
    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#include <sys/types.h>
#include <stdlib.h>
#include <stddef.h>
#include <sys/socket.h>
#include <sys/un.h>]], [[
  struct sockaddr_un sunaddr; 
  sunaddr.sun_family = AF_UNIX;
]])],[squid_cv_unixsocket=yes],[squid_cv_unixsocket=no])])
if test x"$squid_cv_unixsocket" = x"yes"; then
   AC_DEFINE(HAVE_UNIXSOCKET,1,[Do we have unix sockets? (required for the winbind ntlm helper])
fi
dnl end rip

  AC_CHECK_LIB(gnumalloc, main)
  if test "$ac_cv_lib_gnumalloc_main" = "yes"; then
		AC_MSG_NOTICE([Disabling extended malloc functions when using gnumalloc])
		ac_cv_func_mallinfo=no
		ac_cv_func_mallocblksize=no
		ac_cv_func_mallopt=no
  else
		case "$host" in
			*-sun-solaris*)
			  AC_MSG_NOTICE([skipping libmalloc check for $host])
				;;
			i386-*-freebsd*)
			  AC_MSG_NOTICE([skipping libmalloc check for $host])
				;;
			*)
  
				AC_CHECK_LIB(malloc, main)
				;;
		esac
  fi

AC_CHECK_LIB(bsd, main)
AC_CHECK_LIB(regex, main, [REGEXLIB="-lregex"])
AC_CHECK_LIB(bind, gethostbyname)
if test $ac_cv_lib_bind_gethostbyname = "no" ; then
    case "$host" in
	i386-*-freebsd*)
		AC_MSG_NOTICE([skipping libresolv checks for $host])
		;;
	*)
		AC_CHECK_LIB(resolv, main)
		;;
    esac
fi
case "$host_os" in
mingw|mingw32)
	AC_MSG_NOTICE([Use MSVCRT for math functions.])
	;;
	*)
	AC_CHECK_LIB(m, main)
	;;
esac

dnl Enable IPv6 support
AC_MSG_CHECKING([whether to enable IPv6])
use_ipng=yes
AC_ARG_ENABLE(ipv6,
  AS_HELP_STRING([--disable-ipv6],[Disable IPv6 support]),
[ if test "x$enableval" = "xyes" ; then
    AC_MSG_RESULT(yes)
  else
    AC_MSG_RESULT(no)
    use_ipng=no
  fi
],[AC_MSG_RESULT(yes)])

if test "$use_ipng" = "yes"; then
  SAVED_LIBS="$LIBS"
  dnl Solaris 10/11 requires  -lsocket
  case "$host" in
    *-solaris*)
      LIBS="$LIBS -lsocket"
      ;;
    *)
      ;;
  esac
  AC_CACHE_CHECK([if PF_INET6 is available], $use_ipng,
    AC_RUN_IFELSE([AC_LANG_SOURCE([[ /* PF_INET6 available check */
#       include <sys/types.h>
#       include <sys/socket.h>
        int main(int argc, char **argv) {
          if (socket(PF_INET6, SOCK_STREAM, 0) < 0)
            return 1;
          else
            return 0;
        }
      ]])],[ AC_MSG_RESULT(yes)
        use_ipng=yes
        SAVED_LIBS="$LIBS" ],[ AC_MSG_RESULT(no)
        use_ipng=no ],[])
   )
   LIBS="$SAVED_LIBS"
fi

if test "$use_ipng" = "yes"; then
  AC_DEFINE(USE_IPV6,1,[Enable support for IPv6 ])
  use_v4mapped=yes

dnl Check for forced split-stack mode
  AC_MSG_CHECKING([for IPv6 split-stack requirement])
  AC_ARG_WITH(ipv6-split-stack,
    AS_HELP_STRING([--with-ipv6-split-stack],[Force-Enable experimental split-stack support for Windows XP and *BSD. Requires IPv6.]),
    [ use_v4mapped="no"
      AC_MSG_RESULT(yes)],
    [ AC_MSG_RESULT(no) ])

dnl Check for IPv6 v4-mapping availability
dnl Useful for other OS with hybrid-stack defaults turned OFF
dnl But only usable if it actually works...
  if test "$use_v4mapped" = "yes" ; then
    AC_MSG_CHECKING([for IPv6 v4-mapping ability])
    AC_RUN_IFELSE([AC_LANG_SOURCE([[ /* IPPROTO_V4MAPPED is usable check */
#       include <sys/types.h>
#       include <sys/socket.h>
#	include <netinet/in.h>
#if HAVE_NETINET_IN6_H
#	include <netinet/in6.h>
#endif
        int main(int argc, char **argv) {
          int s = socket(PF_INET6, SOCK_STREAM, 0);
          int tos = 0;
          if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, (char *) &tos, sizeof(int)) < 0)
            return 1;
          else
            return 0;
        }
      ]])],[ AC_MSG_RESULT(yes)
        use_v4mapped=yes
        AC_DEFINE(IPV6_SPECIAL_V4MAPPED, 1, [Enable v4-mapping through v6 sockets])
      ],[ AC_MSG_RESULT(no)
        AC_DEFINE(IPV6_SPECIAL_V4MAPPED, 0, [Enable v4-mapping through v6 sockets])
        use_v4mapped=no
      ],[])
  fi

dnl if we can't defer v4-mapping to the OS we are forced to split-stack the FD table.
  AC_MSG_CHECKING([for IPv6 stack type/mode])
  if test "$use_v4mapped" = "yes"; then
    AC_DEFINE(IPV6_SPECIAL_V4MAPPED, 1, [Enable v4-mapping through v6 sockets. Requires IPv6 hybrid-stack.])
    AC_DEFINE(IPV6_SPECIAL_SPLITSTACK, 0, [Enable support for IPv6 on split-stack implementations])
    AC_MSG_RESULT(mapping hybrid)
  else
    AC_DEFINE(IPV6_SPECIAL_V4MAPPED, 0, [Enable v4-mapping through v6 sockets. Requires IPv6 hybrid-stack.])
    AC_DEFINE(IPV6_SPECIAL_SPLITSTACK, 1, [Enable support for IPv6 on split-stack implementations])
    AC_MSG_RESULT(split-stack or BSD non-mapping dual-stack)
  fi

dnl Check whether this OS defines sin6_len as a member of sockaddr_in6 as a backup to ss_len
AC_CACHE_CHECK([for sin6_len field in struct sockaddr_in6],
                ac_cv_have_sin6_len_in_struct_sai, [
        AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
                ]], [[ struct sockaddr_in6 s; s.sin6_len = 1; ]])],[ ac_cv_have_sin6_len_in_struct_sai="yes" ],[ ac_cv_have_sin6_len_in_struct_sai="no" 
        ])
  ])
  if test "x$ac_cv_have_sin6_len_in_struct_sai" = "xyes" ; then
    AC_DEFINE(HAVE_SIN6_LEN_IN_SAI, 1, [Does struct sockaddr_in6 have sin6_len? 1: Yes, 0: No])
  else
    AC_DEFINE(HAVE_SIN6_LEN_IN_SAI, 0, [Does struct sockaddr_in6 have sin6_len? 1: Yes, 0: No])
  fi

else
  # NP: semi-silent failure as IPv4-only mode is perfectly usable on this system.
  AC_MSG_WARN([IPv6 is not available on this system.])
  AC_DEFINE(USE_IPV6,0,[Enable support for IPv6])
  AC_DEFINE(IPV6_SPECIAL_SPLITSTACK,0,[Enable support for IPv6 on split-stack implementations])
  AC_DEFINE(IPV6_SPECIAL_V4MAPPED,0,[Enable v4-mapping through v6 sockets])
fi

dnl Check whether this OS defines ss_len as a member of sockaddr_storage
AC_CACHE_CHECK([for ss_len field in struct sockaddr_storage],
		ac_cv_have_ss_len_in_struct_ss, [
	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
		]], [[ struct sockaddr_storage s; s.ss_len = 1; ]])],[ ac_cv_have_ss_len_in_struct_ss="yes" ],[ ac_cv_have_ss_len_in_struct_ss="no" 
	])
])
if test "x$ac_cv_have_ss_len_in_struct_ss" = "xyes" ; then
	AC_DEFINE(HAVE_SS_LEN_IN_SS, 1, [Does struct sockaddr_storage have ss_len? 1: Yes, 0: No])
else
	AC_DEFINE(HAVE_SS_LEN_IN_SS, 0, [Does struct sockaddr_storage have ss_len? 1: Yes, 0: No])
fi

dnl Check whether this OS defines sin_len as a member of sockaddr_in as a backup to ss_len
AC_CACHE_CHECK([for sin_len field in struct sockaddr_in],
                ac_cv_have_sin_len_in_struct_sai, [
        AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
                ]], [[ struct sockaddr_in s; s.sin_len = 1; ]])],[ ac_cv_have_sin_len_in_struct_sai="yes" ],[ ac_cv_have_sin_len_in_struct_sai="no" 
        ])
])
if test "x$ac_cv_have_sin_len_in_struct_sai" = "xyes" ; then
        AC_DEFINE(HAVE_SIN_LEN_IN_SAI, 1, [Does struct sockaddr_in have sin_len? 1: Yes, 0: No])
else
        AC_DEFINE(HAVE_SIN_LEN_IN_SAI, 0, [Does struct sockaddr_in have sin_len? 1: Yes, 0: No])
fi

dnl Check for libcrypt
CRYPTLIB=
dnl Some of our helpers use crypt(3) which may be in libc, or in
dnl libcrypt (eg FreeBSD)
AC_CHECK_LIB(crypt, crypt, [CRYPTLIB="-lcrypt"])
dnl Solaris10 provides MD5 natively through libmd5
AC_CHECK_LIB(md5, MD5Init, [CRYPTLIB="$CRYPTLIB -lmd5"])
AC_SUBST(CRYPTLIB)

# check for crypt, may require -lcrypt
SAVED_LIBS="$LIBS"
LIBS="$LIBS $CRYPTLIB"
AC_CHECK_FUNCS(crypt)
LIBS="$SAVED_LIBS"


dnl Check for libdl, used by auth_modules/PAM
if test "$with_dl" = "yes"; then
    AC_CHECK_LIB(dl, dlopen)
fi

dnl -lintl is needed on SCO version 3.2v4.2 for strftime()
dnl Robert Side <rside@aiinc.bc.ca>
dnl Mon, 18 Jan 1999 17:48:00 GMT
case "$host" in
	*-pc-sco3.2*)
		AC_CHECK_LIB(intl, strftime)
		;;
esac

dnl On MinGW OpenLDAP is not available, so LDAP helpers can be linked 
dnl only with Windows LDAP libraries using -lwldap32
case "$host_os" in
mingw|mingw32)
	LDAPLIB="-lwldap32"
	LBERLIB=""
	;;
*)
	LDAPLIB="-lldap"
	dnl LDAP helpers need to know if -llber is needed or not
	AC_CHECK_LIB(lber, main, [LBERLIB="-llber"])
	;;
esac
AC_SUBST(LDAPLIB)
AC_SUBST(LBERLIB)

dnl Check for libdb
DBLIB=
dnl 1.85
AC_CACHE_CHECK(if dbopen needs -ldb,ac_cv_dbopen_libdb, [
SAVED_LIBS="$LIBS"; LIBS="$LIBS -ldb"
  AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#if HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#if HAVE_LIMITS_H
#include <limits.h>
#endif
#if HAVE_DB_185_H
#include <db_185.h>
#elif HAVE_DB_H
#include <db.h>
#endif]], [[dbopen("", 0, 0, DB_HASH, (void *)0L)]])],[ac_cv_dbopen_libdb="yes"],[ac_cv_dbopen_libdb="no"])
LIBS="$SAVED_LIBS"
])
if test $ac_cv_dbopen_libdb = yes; then
    LIB_DB="-ldb"
fi
AC_SUBST(LIB_DB)

dnl System-specific library modifications
dnl
case "$host" in
	i386-*-solaris2.*)
    		if test "$GCC" = "yes"; then
			AC_MSG_NOTICE([Removing -O for gcc on $host])
			CFLAGS="`echo $CFLAGS | sed -e 's/-O[[0-9]]*//'`"
		fi
		;;
	*-sgi-irix*)
        	AC_MSG_NOTICE([Removing -lsocket for IRIX...])
        	LIBS=`echo $LIBS | sed -e s/-lsocket//`
        	AC_MSG_NOTICE([Removing -lnsl for IRIX...])
        	LIBS=`echo $LIBS | sed -e s/-lnsl//`
		ac_cv_lib_nsl_main=no
		AC_MSG_NOTICE([Removing -lbsd for IRIX...])
		LIBS=`echo $LIBS | sed -e s/-lbsd//`
		;;
dnl From: c0032033@ws.rz.tu-bs.de (Joerg Schumacher)
dnl Date: Thu, 17 Oct 1996 04:09:30 +0200
dnl Please change your configure script.  AIX doesn't need -lbsd.
	*-ibm-aix*)
		AC_MSG_NOTICE([Removing -lbsd for AIX...])
		LIBS=`echo $LIBS | sed -e s/-lbsd//`
		;;
	*m88k*)
		SQUID_CFLAGS="$SQUID_CFLAGS -D_SQUID_MOTOROLA_"
		SQUID_CXXFLAGS="$SQUID_CXXFLAGS -D_SQUID_MOTOROLA_"
		AC_DEFINE(GETTIMEOFDAY_NO_TZP,1,[If gettimeofday is known to take only one argument])
		;;
	[*-*-solaris2.[0-4]])
		AC_DEFINE(GETTIMEOFDAY_NO_TZP,1)
		;;
	[*-sony-newsos[56]*])
		AC_DEFINE(GETTIMEOFDAY_NO_TZP,1)
		;;
esac

# Remove optimization for GCC 2.95.[123]
# gcc -O[2] on *BSD and Linux (x86) causes pointers to magically become NULL
if test "$GCC" = "yes"; then
	GCCVER=`$CC -v 2>&1 | awk '$2 ==  "version" {print $3}'`
	case "$GCCVER" in
	[2.95.[123]])
		AC_MSG_NOTICE([Removing -O for gcc on $host with GCC $GCCVER])
		CFLAGS="`echo $CFLAGS | sed -e 's/-O[[0-9]]*//'`"
		;;
	esac
fi

# Recommended by Balint Nagy Endre <bne@CareNet.hu>
case "$host" in
	*-univel-sysv4.2MP)
		if test `uname -v` = "2.03"; then
			AC_MSG_NOTICE([disabling mallinfo for $host])
			ac_cv_func_mallinfo=no
		fi
		;;
esac

dnl This has to be before AC_CHECK_FUNCS
# Disable poll() on certain platforms. Override by setting ac_cv_func_poll
# when running configure.
if test -z "$ac_cv_func_poll"; then
	case "$host" in
		[alpha-dec-osf3.*])
			# John Kay (jkay@nlanr.net) 19970818
			AC_MSG_NOTICE([disabling poll for $host...])
			ac_cv_func_poll='no'
			;;
		[*-hp-hpux*.*])
			# Duane Wessels
			AC_MSG_NOTICE([disabling poll for $host...])
			ac_cv_func_poll='no'
			;;
		[*-linux-*])
			# Henrik Nordstrom (hno@squid-cache.org) 19980817
			# poll is problematic on Linux.  We disable it
			# by default until Linux gets it right.
			rev=`uname -r | awk -F. '{printf "%03d%03d",$1,$2}'`
			if test $rev -lt 002002; then
			    AC_MSG_NOTICE([disabling poll for $host < 2.2...])
			    ac_cv_func_poll='no'
			fi
			;;
		[powerpc-ibm-aix4.1.*])
			# Mike Laster (mlaster@metavillage.com) 19981021
			AC_MSG_NOTICE([disabling poll for $host...])
			ac_cv_func_poll='no'
			;;
		[*-pc-sco3.2*])
			# Robert Side <rside@aiinc.bc.ca>
			# Mon, 18 Jan 1999 17:48:00 GMT
			AC_MSG_NOTICE([disabling poll for $host...])
			ac_cv_func_poll='no'
			;;
	esac
fi

dnl Override statfs() detect on MinGW becasue is emulated in source code
case "$host_os" in
mingw|mingw32)
	ac_cv_func_statfs='yes'
	;;
esac

dnl Check for library functions
AC_CHECK_FUNCS(\
	backtrace_symbols_fd \
	bcopy \
	bswap_16 \
	bswap_32 \
	bswap16 \
	bswap32 \
	fchmod \
	getdtablesize \
	getpagesize \
	getpass \
	getrlimit \
	getrusage \
	getspnam \
	gettimeofday \
	glob \
	htobe16 \
	htole16 \
	kqueue\
	lrand48 \
	mallinfo \
	mallocblksize \
	mallopt \
	memcpy \
	memmove \
	memset \
	mkstemp \
	mktime \
	mstats \
	poll \
	prctl \
	pthread_attr_setschedparam \
	pthread_attr_setscope \
	pthread_setschedparam \
	pthread_sigmask \
	putenv \
	random \
	regcomp \
	regexec \
	regfree \
	res_init \
	__res_init \
	rint \
	sbrk \
	select \
	seteuid \
	setgroups \
	setpgrp \
	setrlimit \
	setsid \
	sigaction \
	snprintf \
	socketpair \
	srand48 \
	srandom \
	statfs \
	sysconf \
	syslog \
	timegm \
	vsnprintf \
)
dnl ... and some we provide local replacements for
AC_REPLACE_FUNCS(\
	drand48 \
	inet_ntop \
	inet_pton \
	initgroups \
	getaddrinfo \
	getnameinfo \
	strerror \
	strsep \
	strtoll \
	tempnam \
)

dnl Magic which checks whether we are forcing a type of comm loop we
dnl are actually going to (ab)use
 
dnl Actually do the define magic now
dnl mostly ripped from squid-commloops, thanks to adrian and benno

if test -n "$SELECT_TYPE"; then
	: # Already decided above. Nothing to do here
elif test -z "$disable_epoll" && test "$ac_cv_epoll_works" = "yes" ; then
	SELECT_TYPE="epoll"
elif test -z "$disable_kqueue" && test "$ac_cv_func_kqueue" = "yes" ; then
	SELECT_TYPE="kqueue"
elif test -z "$disable_poll" && test "$ac_cv_func_poll" = "yes" ; then
        SELECT_TYPE="poll"
elif test -z "$disable_select" && test "$ac_cv_func_select" = "yes" ; then
	case "$host_os" in
	mingw|mingw32)
	        SELECT_TYPE="select_win32"
		;;
	*)
	        SELECT_TYPE="select"
		;;
	esac
else
        AC_MSG_WARN([Eep!  Can't find poll, kqueue, epoll, or select!])
        AC_MSG_WARN([I'll try select and hope for the best.])
        SELECT_TYPE="select"
        AC_DEFINE(USE_SELECT,1)
fi

AC_MSG_NOTICE([Using ${SELECT_TYPE} for the IO loop.])

AM_CONDITIONAL([USE_POLL], [test $SELECT_TYPE = poll])
AM_CONDITIONAL([USE_EPOLL], [test $SELECT_TYPE = epoll])
AM_CONDITIONAL([USE_SELECT], [test $SELECT_TYPE = select])
AM_CONDITIONAL([USE_SELECT_SIMPLE], [test $SELECT_TYPE = select_simple])
AM_CONDITIONAL([USE_SELECT_WIN32], [test $SELECT_TYPE = select_win32])
AM_CONDITIONAL([USE_KQUEUE], [test $SELECT_TYPE = kqueue])
AM_CONDITIONAL([USE_DEVPOLL], [test $SELECT_TYPE = devpoll])

case $SELECT_TYPE in
epoll)
	AC_DEFINE(USE_EPOLL,1,[Use epoll() for the IO loop])
	;;
poll)
        AC_DEFINE(USE_POLL,1,[Use poll() for the IO loop])
	;;
kqueue)
	AC_DEFINE(USE_KQUEUE,1,[Use kqueue() for the IO loop])
	;;
select_win32)
	AC_DEFINE(USE_SELECT_WIN32,1,[Use Winsock select() for the IO loop])
	;;
select)
	AC_DEFINE(USE_SELECT,1,[Use select() for the IO loop])
	;;
esac



dnl Yay!  Another Linux brokenness.  Its not good enough
dnl to know that setresuid() exists, because RedHat 5.0 declares
dnl setresuid() but doesn't implement it.
dnl
AC_CACHE_CHECK(if setresuid is implemented, ac_cv_func_setresuid,
  AC_RUN_IFELSE([AC_LANG_SOURCE([[
#include <stdlib.h>
  int main(int argc, char **argv) {
    if(setresuid(-1,-1,-1)) {
      perror("setresuid:");
      return 1;
    }
    return 0;
  }
  ]])],[ac_cv_func_setresuid="yes"],[ac_cv_func_setresuid="no"],[])
)
if test "$ac_cv_func_setresuid" = "yes" ; then
  AC_DEFINE(HAVE_SETRESUID,1,[Yay! Another Linux brokenness.  Its not good enough to know that setresuid() exists, because RedHat 5.0 declare setresuid() but doesn't implement it.])
fi

dnl Yay!  This one is  a MacOSX brokenness.  Its not good enough
dnl to know that strnstr() exists, because MacOSX 10.4 have a bad
dnl copy that crashes with a buffer over-run!
dnl
AC_CACHE_CHECK(if strnstr is well implemented, ac_cv_func_strnstr,
  AC_RUN_IFELSE([AC_LANG_SOURCE([[
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
    // we expect this to succeed, or crash on over-run.
    // if it passes otherwise we may need a better check.
int main(int argc, char **argv)
{
    int size = 20;
    char *str = malloc(size);
    memset(str, 'x', size);
    strnstr(str, "fubar", size);
    return 0;
}
  ]])],[ac_cv_func_strnstr="yes"],[ac_cv_func_strnstr="no"],[])
)
if test "$ac_cv_func_strnstr" = "yes" ; then
  AC_DEFINE(HAVE_STRNSTR,1,[Yay! We have a working strnstr!])
else
  AC_DEFINE(HAVE_STRNSTR,0,[Yay! A MacOS X brokenness. Its not good enough to know that strnstr() exists, because MacOSX 10.4 and earlier may have a buffer overrun.])
fi

dnl
dnl Test for va_copy
dnl
AC_CACHE_CHECK(if va_copy is implemented, ac_cv_func_va_copy,
  AC_RUN_IFELSE([AC_LANG_SOURCE([[
      #include <stdarg.h>
      #include <stdlib.h>
      int f (int i, ...) {
         va_list args1, args2;
         va_start (args1, i);
         va_copy (args2, args1);
         if (va_arg (args2, int) != 42 || va_arg (args1, int) != 42)
            return 1;
         va_end (args1); va_end (args2);
         return 0;
      }
      int main(int argc, char **argv) { return f (0, 42); }
      ]])],[ac_cv_func_va_copy="yes"],[ac_cv_func_va_copy="no"],[])
)
if test "$ac_cv_func_va_copy" = "yes" ; then
  AC_DEFINE(HAVE_VA_COPY, 1, [If your system have va_copy])
fi

dnl
dnl Some systems support __va_copy
dnl
AC_CACHE_CHECK(if __va_copy is implemented, ac_cv_func___va_copy,
  AC_RUN_IFELSE([AC_LANG_SOURCE([[
      #include <stdarg.h>
      #include <stdlib.h>
      int f (int i, ...) {
         va_list args1, args2;
         va_start (args1, i);
         __va_copy (args2, args1);
         if (va_arg (args2, int) != 42 || va_arg (args1, int) != 42)
            return 1;
         va_end (args1); va_end (args2);
         return 0;
      }
      int main(int argc, char **argv) { return f (0, 42); }
      ]])],[ac_cv_func___va_copy="yes"],[ac_cv_func___va_copy="no"],[])
)
if test "$ac_cv_func___va_copy" = "yes" ; then
  AC_DEFINE(HAVE___VA_COPY, 1, [Some systems have __va_copy instead of va_copy])
fi
  
dnl IP-Filter support requires ipf header files. These aren't
dnl installed by default, so we need to check for them
if test "$IPF_TRANSPARENT" ; then
    AC_MSG_CHECKING(if IP-Filter header files are installed)
    # hold on to your hats...
    if test "$ac_cv_header_ip_compat_h" = "yes" ||
        test "$ac_cv_header_ip_fil_compat_h" = "yes" ||
        test "$ac_cv_header_netinet_ip_compat_h" = "yes" ||
        test "$ac_cv_header_netinet_ip_fil_compat_h" = "yes" ; then
        have_ipfilter_compat_header="yes"
     fi
     if test "x$have_ipfilter_compat_header" = "xyes" &&
       test "$ac_cv_header_ip_fil_h" = "yes" &&
       test "$ac_cv_header_ip_nat_h" = "yes" ; then
        IPF_TRANSPARENT="yes"
        AC_DEFINE(IPF_TRANSPARENT, 1)
    elif test "$have_ipfilter_compat_header" = "yes" &&
         test "$ac_cv_header_netinet_ip_fil_h" = "yes" &&
         test "$ac_cv_header_netinet_ip_nat_h" = "yes" ; then
        IPF_TRANSPARENT="yes"
        AC_DEFINE(IPF_TRANSPARENT, 1)
    else
        IPF_TRANSPARENT="no"
        AC_DEFINE(IPF_TRANSPARENT, 0)
    fi
    AC_MSG_RESULT($IPF_TRANSPARENT)
fi 
if test "$IPF_TRANSPARENT" = "no" ; then
    AC_MSG_WARN([Cannot find necessary IP-Filter header files])
    AC_MSG_WARN([Transparent Proxy support WILL NOT be enabled])
    sleep 10
elif test "$IPF_TRANSPARENT" = "yes" ; then
dnl On Solaris Ipfilter includes expect that SOLARIS2 is defined with the
dnl Solaris minor version (8, 9, 10, ...)
    case "$host" in
	*-solaris*)
	    solrev=`uname -r | sh -c 'IFS=. read j n x; echo $n'`
	    CFLAGS="-DSOLARIS2=$solrev $CFLAGS" 
	    CXXFLAGS="-DSOLARIS2=$solrev $CXXFLAGS" 
	    ;;
	*)
	    ;;
    esac
fi

dnl PF support requires a header file.
if test "$PF_TRANSPARENT" ; then
    AC_MSG_CHECKING(if PF header file is installed)
    # hold on to your hats...
    if test "$ac_cv_header_net_pfvar_h" = "yes" || test "$ac_cv_header_net_pf_pfvar_h" = "yes"; then
        PF_TRANSPARENT="yes"
        AC_DEFINE(PF_TRANSPARENT, 1)
    else
        PF_TRANSPARENT="no"
        AC_DEFINE(PF_TRANSPARENT, 0)
    fi
    AC_MSG_RESULT($PF_TRANSPARENT)
fi
if test "$PF_TRANSPARENT" = "no" ; then
    AC_MSG_WARN([Cannot find necessary PF header file])
    AC_MSG_WARN([Transparent Proxy support WILL NOT be enabled])
    sleep 10
fi

dnl Linux-Netfilter support requires Linux 2.4 kernel header files.
dnl Shamelessly copied from above
if test "$LINUX_NETFILTER" ; then
    AC_MSG_CHECKING(if Linux (Netfilter) kernel header files are installed)
    # hold on to your hats...
    if test "$ac_cv_header_linux_netfilter_ipv4_h" = "yes"; then
        LINUX_NETFILTER="yes"
        AC_DEFINE(LINUX_NETFILTER, 1)
    else
        LINUX_NETFILTER="no"
        AC_DEFINE(LINUX_NETFILTER, 0)
    fi
    AC_MSG_RESULT($LINUX_NETFILTER)
fi
if test "$LINUX_NETFILTER" = "no" ; then
    AC_MSG_WARN([Cannot find necessary Linux kernel (Netfilter) header files])
    AC_MSG_WARN([Linux Transparent and Intercepting Proxy support WILL NOT be enabled])
    LINUX_TPROXY2="no"
    AC_DEFINE(LINUX_TPROXY2, 0, [Enable real Transparent Proxy support for Netfilter TPROXY v2.])
    sleep 10
fi
dnl Netfilter TPROXY depends on libcap but the NAT parts can still work.
if test "$LINUX_NETFILTER" = "yes" && test "$use_libcap" != "yes" ; then
    AC_MSG_WARN([Missing needed capabilities (libcap or libcap2) for TPROXY])
    AC_MSG_WARN([Linux Transparent Proxy support WILL NOT be enabled])
    AC_MSG_WARN([Reduced support to Interception Proxy])
    LINUX_TPROXY2="no"
    AC_DEFINE(LINUX_TPROXY2, 0, [Enable real Transparent Proxy support for Netfilter TPROXY v2.])
    sleep 10
fi

dnl Linux Netfilter/TPROXYv2 support requires some specific header files
dnl Shamelessly copied from above
if test "$LINUX_TPROXY2"; then
  if test "$use_libcap" = "yes"; then
    AC_MSG_CHECKING(if TPROXYv2 header files are installed)
    # hold on to your hats...
    if test "$ac_cv_header_linux_netfilter_ipv4_ip_tproxy_h" = "yes" && test "$LINUX_NETFILTER" = "yes"; then
	LINUX_TPROXY2="yes"
	AC_DEFINE(LINUX_TPROXY2, 1, [Enable real Transparent Proxy support for Netfilter TPROXY v2.])
    else
	LINUX_TPROXY2="no"
	AC_DEFINE(LINUX_TPROXY2, 0, [Enable real Transparent Proxy support for Netfilter TPROXY v2.])
    fi
    AC_MSG_RESULT($LINUX_TPROXY2)
    if test "$LINUX_TPROXY2" = "no" && test "$LINUX_NETFILTER" = "yes"; then
        AC_MSG_WARN([Cannot find TPROXY v2 headers, you need to patch the kernel with ])
        AC_MSG_WARN([tproxy package from:])
        AC_MSG_WARN([ - lynx http://www.balabit.com/downloads/files/tproxy/])
        AC_MSG_WARN([Or select the '--enable-linux-netfilter' option instead for Netfilter support.])
        sleep 10
    fi
  else
    AC_MSG_WARN([Missing needed capabilities (libcap or libcap2) for TPROXY v2])
    AC_MSG_WARN([Linux Transparent Proxy support WILL NOT be enabled])
    LINUX_TPROXY2="no"
    AC_DEFINE(LINUX_TPROXY2, 0, [Enable real Transparent Proxy support for Netfilter TPROXY v2.])
    sleep 10
  fi
fi

AC_ARG_ENABLE(gnuregex,
  AS_HELP_STRING([--enable-gnuregex],[Compile GNUregex.  Unless you have reason to use 
                 this option, you should not enable it.
                 This library file is usually only required on Windows and 
                 very old Unix boxes which do not have their own regex 
                 library built in.]),
[USE_GNUREGEX=$enableval])
if test -z "$USE_GNUREGEX" ; then
    case "$host" in
    *-sun-solaris2.[[0-4]])
	  USE_GNUREGEX="yes"
	  ;;
    *-next-nextstep*)
	  USE_GNUREGEX="yes"
	  ;;
    esac
fi
AC_MSG_CHECKING(if GNUregex needs to be compiled)
if test -z "$USE_GNUREGEX"; then
if test "$ac_cv_func_regcomp" = "no" || test "$USE_GNUREGEX" = "yes" ; then
	USE_GNUREGEX="yes"
else
	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/types.h>
#include <regex.h>]], [[regex_t t; regcomp(&t,"",0);]])],[USE_GNUREGEX="no"],[USE_GNUREGEX="yes"])
fi
fi
AC_MSG_RESULT($USE_GNUREGEX)
if test "$USE_GNUREGEX" = "yes"; then
	# override system regex with ours. Not good. But what was asked for.
	REGEXLIB=""
	AC_DEFINE(USE_GNUREGEX,1,[Define if we should use GNU regex])
fi
AC_SUBST(REGEXLIB)
#AC_SUBST(LIBREGEX)

dnl Not cached since people are likely to tune this
AC_MSG_CHECKING(Default FD_SETSIZE value)
AC_RUN_IFELSE([AC_LANG_SOURCE([[
#if HAVE_STDIO_H
#include <stdio.h>
#endif
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#if HAVE_STDLIB_H
#include <stdlib.h>
#endif
#if HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#if HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#if HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#if HAVE_WINSOCK_H
#include <winsock.h>
#endif
#if HAVE_WINSOCK2_H
#include <winsock2.h>
#endif
int main(int argc, char **argv) {
	FILE *fp = fopen("conftestval", "w");
	fprintf (fp, "%d\n", FD_SETSIZE);
	return 0;
}
]])],[DEFAULT_FD_SETSIZE=`cat conftestval`],[DEFAULT_FD_SETSIZE=256],[DEFAULT_FD_SETSIZE=256])
AC_MSG_RESULT($DEFAULT_FD_SETSIZE)
AC_DEFINE_UNQUOTED(DEFAULT_FD_SETSIZE, $DEFAULT_FD_SETSIZE, [Default FD_SETSIZE value])


dnl Not cached since people are likely to tune this
AC_MSG_CHECKING(Maximum number of filedescriptors we can open)
dnl damn! FreeBSD's pthreads breaks dup2().
TLDFLAGS="$LDFLAGS"
if test -n "$squid_filedescriptors_num" ; then
  SQUID_MAXFD=$squid_filedescriptors_num
  AC_MSG_RESULT($SQUID_MAXFD (user-forced))
else
  case $host in
  i386-unknown-freebsd*)
      if echo "$LDFLAGS" | grep -q pthread; then
  	LDFLAGS=`echo $LDFLAGS | sed -e "s/-pthread//"`
      fi
  esac
  AC_RUN_IFELSE([AC_LANG_SOURCE([[
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/time.h>	/* needed on FreeBSD */
#include <sys/param.h>
#include <sys/resource.h>
int main(int argc, char **argv) {
	FILE *fp;
	int i,j;
#if defined(__CYGWIN32__) || defined (__CYGWIN__)
    /* getrlimit and sysconf returns bogous values on cygwin32.
     * Number of fds is virtually unlimited in cygwin (sys/param.h)
     * __CYGWIN32__ is deprecated.
     */
    i = NOFILE;
#else
#if HAVE_SETRLIMIT
    struct rlimit rl;
#if defined(RLIMIT_NOFILE)
    if (getrlimit(RLIMIT_NOFILE, &rl) < 0) {
        perror("getrlimit: RLIMIT_NOFILE");
    } else {
#if defined(__APPLE__)
        /* asking for more than OPEN_MAX fails on Leopard */
        rl.rlim_cur = (OPEN_MAX < rl.rlim_max ? OPEN_MAX : rl.rlim_max);
#else
        rl.rlim_cur = rl.rlim_max;      /* set it to the max */
#endif
        if (setrlimit(RLIMIT_NOFILE, &rl) < 0) {
            perror("setrlimit: RLIMIT_NOFILE");
        }
    }
#elif defined(RLIMIT_OFILE)
    if (getrlimit(RLIMIT_OFILE, &rl) < 0) {
        perror("getrlimit: RLIMIT_OFILE");
    } else {
        rl.rlim_cur = rl.rlim_max;      /* set it to the max */
        if (setrlimit(RLIMIT_OFILE, &rl) < 0) {
            perror("setrlimit: RLIMIT_OFILE");
        }
    }
#endif /* RLIMIT_NOFILE */
#endif /* HAVE_SETRLIMIT */
	/* by starting at 2^14, we will never get higher
	than 2^15 for SQUID_MAXFD */
        i = j = 1<<14;
        while (j) {
                j >>= 1;
                if (dup2(0, i) < 0) { 
                        i -= j;
                } else {
                        close(i);
                        i += j;
                }
        }
        i++;
#endif /* IF !DEF CYGWIN */
	fp = fopen("conftestval", "w");
	fprintf (fp, "%d\n", i & ~0x3F);
	return 0;
}
  ]])],[SQUID_MAXFD=`cat conftestval`],[SQUID_MAXFD=256],[SQUID_MAXFD=256])
  dnl Microsoft MSVCRT.DLL supports 2048 maximum FDs
  case "$host_os" in
  mingw|mingw32)
    SQUID_MAXFD="2048"
    ;;
  esac
  AC_MSG_RESULT($SQUID_MAXFD)
fi
AC_DEFINE_UNQUOTED(SQUID_MAXFD, $SQUID_MAXFD,[Maximum number of open filedescriptors])
if test "$SQUID_MAXFD" -lt 512 ; then
    AC_MSG_WARN([$SQUID_MAXFD may not be enough filedescriptors if your])
    AC_MSG_WARN([cache will be very busy.  Please see the FAQ page])
    AC_MSG_WARN([http://wiki.squid-cache.org/SquidFaq/TroubleShooting])
    AC_MSG_WARN([on how to increase your filedescriptor limit])
    sleep 10
fi
LDFLAGS="$TLDFLAGS"

if test `expr $SQUID_MAXFD % 64` != 0; then
    AC_MSG_WARN([$SQUID_MAXFD is not an multiple of 64. This may cause issues on certain platforms.])
    sleep 10
fi

dnl Not cached since people are likely to tune this
AC_MSG_CHECKING(Default UDP send buffer size)
AC_RUN_IFELSE([AC_LANG_SOURCE([[
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#if HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#if HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#if HAVE_WINSOCK_H
#include <winsock.h>
#endif
#if HAVE_WINSOCK2_H
#include <winsock2.h>
#endif
int main(int argc, char **argv)
{
	FILE *fp;
        int fd,val=0;
#if (defined(WIN32) || defined(__WIN32__) || defined(__WIN32)) && !(defined(__CYGWIN32__) || defined(__CYGWIN__))
        int len=sizeof(int);
	WSADATA wsaData;
	WSAStartup(2, &wsaData);
#else
        socklen_t len=sizeof(socklen_t);
#endif
	if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) return 1;
#if (defined(WIN32) || defined(__WIN32__) || defined(__WIN32)) && !(defined(__CYGWIN32__) || defined(__CYGWIN__))
        if (getsockopt(fd, SOL_SOCKET, SO_SNDBUF, (char *)&val, &len) < 0) return 1;
	WSACleanup();
#else
        if (getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &val, &len) < 0) return 1;
#endif
	if (val<=0) return 1;
        fp = fopen("conftestval", "w");
        fprintf (fp, "%d\n", val);
	return 0;
}
]])],[SQUID_DETECT_UDP_SO_SNDBUF=`cat conftestval`],[SQUID_DETECT_UDP_SO_SNDBUF=16384],[SQUID_DETECT_UDP_SO_SNDBUF=16384])
AC_MSG_RESULT($SQUID_DETECT_UDP_SO_SNDBUF)
AC_DEFINE_UNQUOTED(SQUID_DETECT_UDP_SO_SNDBUF, $SQUID_DETECT_UDP_SO_SNDBUF,[UDP send buffer size])

dnl Not cached since people are likely to tune this
AC_MSG_CHECKING(Default UDP receive buffer size)
AC_RUN_IFELSE([AC_LANG_SOURCE([[
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#if HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#if HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#if HAVE_WINSOCK_H
#include <winsock.h>
#endif
#if HAVE_WINSOCK2_H
#include <winsock2.h>
#endif
int main(int argc, char **argv)
{
	FILE *fp;
        int fd,val=0;
#if (defined(WIN32) || defined(__WIN32__) || defined(__WIN32)) && !(defined(__CYGWIN32__) || defined(__CYGWIN__))
        int len=sizeof(int);
	WSADATA wsaData;
	WSAStartup(2, &wsaData);
#else
        socklen_t len=sizeof(socklen_t);
#endif
	if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) return 1;
#if (defined(WIN32) || defined(__WIN32__) || defined(__WIN32)) && !(defined(__CYGWIN32__) || defined(__CYGWIN__))
        if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, (char *)&val, &len) < 0) return 1;
	WSACleanup();
#else
        if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &val, &len) < 0) return 1;
#endif
	if (val <= 0) return 1;
	fp = fopen("conftestval", "w"); 
	fprintf (fp, "%d\n", val);
	return 0;
}
]])],[SQUID_DETECT_UDP_SO_RCVBUF=`cat conftestval`],[SQUID_DETECT_UDP_SO_RCVBUF=16384],[SQUID_DETECT_UDP_SO_RCVBUF=16384])
AC_MSG_RESULT($SQUID_DETECT_UDP_SO_RCVBUF)
AC_DEFINE_UNQUOTED(SQUID_DETECT_UDP_SO_RCVBUF, $SQUID_DETECT_UDP_SO_RCVBUF,[UDP receive buffer size])

dnl Not cached since people are likely to tune this
AC_MSG_CHECKING(Default TCP send buffer size)
AC_RUN_IFELSE([AC_LANG_SOURCE([[
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#if HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#if HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#if HAVE_WINSOCK_H
#include <winsock.h>
#endif
#if HAVE_WINSOCK2_H
#include <winsock2.h>
#endif
int main(int argc, char **argv)
{
	FILE *fp;
        int fd,val=0;
#if (defined(WIN32) || defined(__WIN32__) || defined(__WIN32)) && !(defined(__CYGWIN32__) || defined(__CYGWIN__))
        int len=sizeof(int);
	WSADATA wsaData;
	WSAStartup(2, &wsaData);
#else
        socklen_t len=sizeof(socklen_t);
#endif
	if ((fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) return 1;
#if (defined(WIN32) || defined(__WIN32__) || defined(__WIN32)) && !(defined(__CYGWIN32__) || defined(__CYGWIN__))
        if (getsockopt(fd, SOL_SOCKET, SO_SNDBUF, (char *)&val, &len) < 0) return 1;
	WSACleanup();
#else
        if (getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &val, &len) < 0) return 1;
#endif
	if (val <= 0) return 1;
	fp = fopen("conftestval", "w"); 
	fprintf (fp, "%d\n", val);
	return 0;
}
]])],[SQUID_TCP_SO_SNDBUF=`cat conftestval`],[SQUID_TCP_SO_SNDBUF=16384],[SQUID_TCP_SO_SNDBUF=16384])
AC_MSG_RESULT($SQUID_TCP_SO_SNDBUF)
if test $SQUID_TCP_SO_SNDBUF -gt 32768; then
    AC_MSG_NOTICE([Limiting send buffer size to 32K])
    SQUID_TCP_SO_SNDBUF=32768
fi
AC_DEFINE_UNQUOTED(SQUID_TCP_SO_SNDBUF, $SQUID_TCP_SO_SNDBUF,[TCP send buffer size])

dnl Not cached since people are likely to tune this
AC_MSG_CHECKING(Default TCP receive buffer size)
AC_RUN_IFELSE([AC_LANG_SOURCE([[
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#if HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#if HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#if HAVE_WINSOCK_H
#include <winsock.h>
#endif
#if HAVE_WINSOCK2_H
#include <winsock2.h>
#endif
int main(int argc, char **argv)
{
	FILE *fp;
        int fd,val=0;
#if (defined(WIN32) || defined(__WIN32__) || defined(__WIN32)) && !(defined(__CYGWIN32__) || defined(__CYGWIN__))
        int len=sizeof(int);
	WSADATA wsaData;
	WSAStartup(2, &wsaData);
#else
        socklen_t len=sizeof(socklen_t);
#endif
	if ((fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) return 1;
#if (defined(WIN32) || defined(__WIN32__) || defined(__WIN32)) && !(defined(__CYGWIN32__) || defined(__CYGWIN__))
        if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, (char *)&val, &len) < 0) return 1;
	WSACleanup();
#else
        if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &val, &len) < 0) return 1;
#endif
	if (val <= 0) return 1;
	fp = fopen("conftestval", "w"); 
	fprintf (fp, "%d\n", val);
	return 0;
}
]])],[SQUID_TCP_SO_RCVBUF=`cat conftestval`],[SQUID_TCP_SO_RCVBUF=16384],[SQUID_TCP_SO_RCVBUF=16384])
AC_MSG_RESULT($SQUID_TCP_SO_RCVBUF)
if test $SQUID_TCP_SO_RCVBUF -gt 65535; then
    AC_MSG_NOTICE([Limiting receive buffer size to 64K])
    SQUID_TCP_SO_RCVBUF=65535
fi
AC_DEFINE_UNQUOTED(SQUID_TCP_SO_RCVBUF, $SQUID_TCP_SO_RCVBUF,[TCP receive buffer size])
AC_CACHE_CHECK(if sys_errlist is already defined, ac_cv_needs_sys_errlist,
  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <stdio.h>]], [[char *s = sys_errlist;]])],[ac_cv_needs_sys_errlist="no"],[ac_cv_needs_sys_errlist="yes"])
)
if test "$ac_cv_needs_sys_errlist" = "yes" ; then
  AC_DEFINE(NEED_SYS_ERRLIST,1,[If we need to declare sys_errlist[] as external])
fi

dnl Not cached since people are likely to change this
AC_MSG_CHECKING(for libresolv _dns_ttl_ hack)
AC_LINK_IFELSE([AC_LANG_PROGRAM([[extern int _dns_ttl_;]], [[return _dns_ttl_;]])],[AC_MSG_RESULT(yes)
AC_DEFINE(LIBRESOLV_DNS_TTL_HACK,1,[If libresolv.a has been hacked to export _dns_ttl_])],[AC_MSG_RESULT(no)])

if test "$ac_cv_header_sys_statvfs_h" = "yes" ; then
AC_MSG_CHECKING(for working statvfs() interface)
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/statvfs.h>
]], [[
struct statvfs sfs;
sfs.f_blocks = sfs.f_bfree = sfs.f_frsize = 
sfs.f_files = sfs.f_ffree = 0;
statvfs("/tmp", &sfs);
]])],[ac_cv_func_statvfs=yes],[ac_cv_func_statvfs=no])
AC_MSG_RESULT($ac_cv_func_statvfs)
if test "$ac_cv_func_statvfs" = "yes" ; then
  AC_DEFINE(HAVE_STATVFS,1,[If your system has statvfs(), and if it actually works!])
fi
fi

dnl Detect what resolver fields we have available to use...
AC_CACHE_CHECK(for _res_ext.nsaddr_list, ac_cv_have_res_ext_nsaddr_list,
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#if HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#if HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#if HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#if HAVE_ARPA_NAMESER_H
#include <arpa/nameser.h>
#endif
#if HAVE_RESOLV_H
#include <resolv.h>
#endif
]], [[_res_ext.nsaddr_list[[0]].s_addr;]])],[ac_cv_have_res_ext_nsaddr_list="yes"],[ac_cv_have_res_ext_nsaddr_list="no"]))
if test "$ac_cv_have_res_ext_nsaddr_list" = "yes" ; then
  AC_DEFINE(_SQUID_RES_NSADDR6_LARRAY,_res_ext.nsaddr_list,[If _res_ext structure has nsaddr_list member])
  AC_DEFINE(_SQUID_RES_NSADDR6_COUNT,ns6count,[Nameserver Counter for IPv6 _res_ext])
fi

if test "$_SQUID_RES_NSADDR6_LIST" = ""; then
AC_CACHE_CHECK(for _res._u._ext.nsaddrs, ac_cv_have_res_ext_nsaddrs,
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#if HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#if HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#if HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#if HAVE_ARPA_NAMESER_H
#include <arpa/nameser.h>
#endif
#if HAVE_RESOLV_H
#include <resolv.h>
#endif
]], [[_res._u._ext.nsaddrs[[0]]->sin6_addr;]])],[ac_cv_have_res_ext_nsaddrs="yes"],[ac_cv_have_res_ext_nsaddrs="no"]))
if test "$ac_cv_have_res_ext_nsaddrs" = "yes" ; then
  AC_DEFINE(_SQUID_RES_NSADDR6_LPTR,_res._u._ext.nsaddrs,[If _res structure has _ext.nsaddrs member])
  AC_DEFINE(_SQUID_RES_NSADDR6_COUNT,_res._u._ext.nscount6,[Nameserver Counter for IPv6 _res])
fi
fi

AC_CACHE_CHECK(for _res.nsaddr_list, ac_cv_have_res_nsaddr_list,
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#if HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#if HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#if HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#if HAVE_ARPA_NAMESER_H
#include <arpa/nameser.h>
#endif
#if HAVE_RESOLV_H
#include <resolv.h>
#endif
]], [[_res.nsaddr_list[[0]];]])],[ac_cv_have_res_nsaddr_list="yes"],[ac_cv_have_res_nsaddr_list="no"]))
if test $ac_cv_have_res_nsaddr_list = "yes" ; then
  AC_DEFINE(_SQUID_RES_NSADDR_LIST,_res.nsaddr_list,[If _res structure has nsaddr_list member])
  AC_DEFINE(_SQUID_RES_NSADDR_COUNT,_res.nscount,[Nameserver counter for IPv4 _res])
fi

if test "$_SQUID_RES_NSADDR_LIST" = ""; then
AC_CACHE_CHECK(for _res.ns_list, ac_cv_have_res_ns_list,
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#if HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#if HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#if HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#if HAVE_ARPA_NAMESER_H
#include <arpa/nameser.h>
#endif
#if HAVE_RESOLV_H
#include <resolv.h>
#endif
]], [[_res.ns_list[[0]].addr;]])],[ac_cv_have_res_ns_list="yes"],[ac_cv_have_res_ns_list="no"]))
if test $ac_cv_have_res_ns_list = "yes" ; then
  AC_DEFINE(_SQUID_RES_NSADDR_LIST,_res.ns_list,[If _res structure has ns_list member])
  AC_DEFINE(_SQUID_RES_NSADDR_COUNT,_res.nscount,[Nameserver counter for IPv4 _res])
fi
fi

dnl Squid will usually attempt to translate when packaging or building from VCS 
use_translation="yes"
AC_ARG_ENABLE(translation,
 AS_HELP_STRING([--disable-translation],[Prevent Squid generating localized error page templates and manuals.
		 Which is usually tried, but may not be needed.]),
[ if test "$enableval" = "no" ; then
    use_translation=no
  fi
])
dnl Squid now has .po translation capability, given the right toolkit
if test "$use_translation" = "yes" ; then
  AX_WITH_PROG([PO2HTML],[po2html])
else
  PO2HTML="off"
fi
AC_SUBST(PO2HTML)

dnl Squid now has limited locale handling ...
dnl on error pages
use_errlocale=yes
AC_ARG_ENABLE(auto-locale,
 AS_HELP_STRING([--disable-auto-locale],[This prevents Squid providing localized error pages based on the
		 clients request headers.
		 When disabled Squid requires explicit language configuration.]),
[ if test "$enableval" = "no" ; then
    use_errlocale=no
  fi
])
if test "$use_errlocale" = "yes" ; then
    AC_MSG_NOTICE([Enabling Multi-Language Support])
    AC_DEFINE(USE_ERR_LOCALES,1,[Use multi-language support on error pages])
else
    AC_MSG_WARN([Disabling Multi-Language Support])
    AC_DEFINE(USE_ERR_LOCALES,0,[Use multi-language support on error pages])
fi

dnl Need the debugging version of malloc if available
XTRA_OBJS=''
if test "$ac_cv_lib_malloc_main" = "yes" ; then
	if test -r /usr/lib/debug/malloc.o ; then
		XTRA_OBJS="$XTRA_OBJS /usr/lib/debug/malloc.o"
	fi
	if test -r /usr/lib/debug/mallocmap.o ; then
		XTRA_OBJS="$XTRA_OBJS /usr/lib/debug/mallocmap.o"
	fi
fi
AC_SUBST(XTRA_OBJS)

if test -z "$XTRA_LIBS"; then
	XTRA_LIBS="$LIBS"
	dnl minor cleanup
	XTRA_LIBS=`echo $XTRA_LIBS | sed -e "s/  */ /g"`
	LIBS=''
fi
AC_SUBST(XTRA_LIBS)

dnl Clean up after OSF/1 core dump bug
rm -f core 

AC_CONFIG_FILES([\
	Makefile \
	compat/Makefile \
	lib/Makefile \
	scripts/Makefile \
	scripts/RunCache \
	scripts/RunAccel \
	src/Makefile \
	src/base/Makefile \
	src/acl/Makefile \
	src/fs/Makefile \
	src/repl/Makefile \
	src/auth/Makefile \
	src/adaptation/Makefile \
	src/adaptation/icap/Makefile \
	src/adaptation/ecap/Makefile \
	src/esi/Makefile \
	src/eui/Makefile \
	src/icmp/Makefile \
	src/ident/Makefile \
	src/ip/Makefile \
	contrib/Makefile \
	snmplib/Makefile \
	icons/Makefile \
	errors/Makefile \
	test-suite/Makefile \
	doc/Makefile \
	doc/manuals/Makefile \
	helpers/Makefile \
	helpers/basic_auth/Makefile \
	helpers/basic_auth/LDAP/Makefile \
	helpers/basic_auth/MSNT/Makefile \
	helpers/basic_auth/NCSA/Makefile \
	helpers/basic_auth/PAM/Makefile \
	helpers/basic_auth/SMB/Makefile \
	helpers/basic_auth/mswin_sspi/Makefile \
	helpers/basic_auth/YP/Makefile \
	helpers/basic_auth/getpwnam/Makefile \
	helpers/basic_auth/multi-domain-NTLM/Makefile \
	helpers/basic_auth/SASL/Makefile \
	helpers/basic_auth/POP3/Makefile \
	helpers/basic_auth/DB/Makefile \
	helpers/basic_auth/squid_radius_auth/Makefile \
	helpers/digest_auth/Makefile \
	helpers/digest_auth/password/Makefile \
	helpers/digest_auth/ldap/Makefile \
	helpers/digest_auth/eDirectory/Makefile \
	helpers/ntlm_auth/Makefile \
	helpers/ntlm_auth/fakeauth/Makefile \
	helpers/ntlm_auth/no_check/Makefile \
	helpers/ntlm_auth/smb_lm/Makefile \
	helpers/ntlm_auth/smb_lm/smbval/Makefile \
	helpers/ntlm_auth/mswin_sspi/Makefile \
	helpers/negotiate_auth/Makefile \
	helpers/negotiate_auth/mswin_sspi/Makefile \
	helpers/external_acl/Makefile \
	helpers/external_acl/ip_user/Makefile \
	helpers/external_acl/ldap_group/Makefile \
	helpers/external_acl/session/Makefile \
	helpers/external_acl/unix_group/Makefile \
	helpers/external_acl/wbinfo_group/Makefile \
	helpers/external_acl/mswin_ad_group/Makefile \
	helpers/external_acl/mswin_lm_group/Makefile \
	helpers/url_rewrite/Makefile \
	helpers/url_rewrite/fake/Makefile \
	tools/Makefile
])

AC_CONFIG_SUBDIRS(lib/libTrie)

# must configure libltdl subdir unconditionally for "make distcheck" to work
AC_CONFIG_SUBDIRS(lib/libLtdl)

AC_OUTPUT