Forcing some configure options now fails the build if they can't be supported.

[thirdparty/squid.git] / configure.in

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

m4_include([acinclude/squid-util.m4])
m4_include([acinclude/compiler-flags.m4])
m4_include([acinclude/os-deps.m4])
m4_include([acinclude/krb5.m4])

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

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

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

AC_MSG_CHECKING([simplified host os])
squid_host_os=`echo $host_os|sed 's/[0-9].*//;s/-.*//g'`
squid_host_os_version=`echo $host_os|tr -d "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-"`
AC_MSG_RESULT($squid_host_os (version $squid_host_os_version))
# on windows squid_host_os is either mingw or cygwin, version is 32

# test for programs
AC_PROG_RANLIB
AC_PROG_CPP
AC_PROG_INSTALL
AC_PROG_LN_S
AC_PROG_EGREP

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(CHMOD, chmod, $FALSE)
AC_PATH_PROG(TR, tr, $FALSE)
AC_PATH_PROG(RM, rm, $FALSE)
AC_PATH_PROG(CPPUNITCONFIG, cppunit-config, false)
dnl Libtool 2.2.6 requires: rm -f
RM="$RM -f"

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
AC_PATH_PROG(POD2MAN, pod2man, $FALSE)

dnl set $(AR)
AC_PATH_PROG(AR, ar, $FALSE)
AR_R="$AR r"
AC_SUBST(AR_R)

squid_opt_enable_werror="yes" # default
AC_ARG_ENABLE(strict-error-checking,
  AS_HELP_STRING([--disable-strict-error-checking],[By default squid is compiled
                 with all possible static compiler error-checks enbled.
                 This flag disables the behavior]),
[ 
  if test "${enableval}" = "no"
  then
    squid_opt_enable_werror="no"
  fi
])

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
fi
dnl LibTool environment is now prepared for setup. Check that it is usable and initialize.
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


SQUID_CC_GUESS_VARIANT
SQUID_CC_GUESS_OPTIONS


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
AM_CONDITIONAL(ENABLE_WIN32SPECIFIC,
               [test "$squid_host_os" = "mingw" -o "$squid_host_os" = "cygwin"])
AM_CONDITIONAL(USE_IPC_WIN32,[test "$squid_host_os" = "mingw"])

if test $squid_host_os = "mingw"; then
        AC_PATH_PROG(WIN32_PSAPI, psapi.dll, none)
        CFLAGS="$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"
        AC_SUBST(MINGW_LIBS)
fi

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="$localstatedir/run/squid.pid"
AC_ARG_WITH(pidfile,
  AS_HELP_STRING([--with-pidfile=PATH],
                 [Default location for squid PID file. default: PREFIX/var/run/squid.pid]),
[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)

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])
        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 $CFLAGS | sed -e 's/-O[0-9]/-O/'`
            ;;
        *)
            CFLAGS="$squid_cv_cc_option_wall $CFLAGS"
            ;;
        esac
    else
        case "$host" in
        *mips-sgi-irix6.*)
            # suggested by Rafael Seidl <rafaels@cthulhu.engr.sgi.com>
            CFLAGS="$squid_cv_cc_option_optimize -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 $CFLAGS"
            CXXFLAGS="$squid_cv_cc_option_optimize -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 $CFLAGS | sed -e 's/-g/-g3/'`
            CFLAGS="$squid_cv_cc_option_optimize $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="$squid_cv_cc_option_wall -Wpointer-arith -Wwrite-strings -Wcomments"
        ;;
    *)
        SQUID_CFLAGS="$squid_cv_cc_option_wall -Wpointer-arith -Wwrite-strings -Wmissing-prototypes -Wmissing-declarations -Wcomments"
        ;;
    esac
    SQUID_CXXFLAGS="$squid_cv_cc_option_wall -Wpointer-arith -Wwrite-strings -Wcomments"
else
    SQUID_CFLAGS=
    SQUID_CXXFLAGS=
fi

if test "$squid_opt_enable_werror" = "no"
then
    SQUID_CFLAGS="$SQUID_CFLAGS $squid_cv_cc_option_werror"
    SQUID_CXXFLAGS="$SQUID_CXXFLAGS $squid_cv_cc_option_werror"
fi

AC_SUBST(SQUID_CFLAGS)
AC_SUBST(SQUID_CXXFLAGS)

SQUID_CXX_CHECK_ARG_FHUGEOBJECTS
if test "$squid_cv_cxx_arg_fhugeobjects" = "yes"; then
        SQUID_CXXFLAGS="$SQUID_CXXFLAGS -fhuge-objects"
fi
# squid_cv_cc_arg_pipe is set by SQUID_CC_GUESS_OPTIONS
SQUID_CXXFLAGS="$SQUID_CXXFLAGS $squid_cv_cc_arg_pipe"
SQUID_CFLAGS="$SQUID_CFLAGS $squid_cv_cc_arg_pipe"

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
])

AH_TEMPLATE(_USE_INLINE_,[Include inline methods into header file])
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_, 1 , [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 support 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 ])

AH_TEMPLATE(XMALLOC_STATISTICS,[Define to have malloc statistics])
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)
fi
])

squid_opt_aufs_threads=""
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 $withval in
  [[0-9]]*)
    squid_opt_aufs_threads=$withval
    ;;
  *)
    AC_MSG_ERROR(--with-aufs-threads expects a numeric argument)
    ;;
  esac
])
if test -n "$squid_opt_aufs_threads"; then
    AC_MSG_NOTICE([With $squid_opt_aufs_threads aufs threads])
    AC_DEFINE_UNQUOTED(AUFS_IO_THREADS,$squid_opt_aufs_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_MSG_CHECKING([for DiskIO modules to be enabled])
squid_disk_module_candidates=""
squid_opt_enable_diskio="auto"  #values: no, yes, "auto"(=yes+detect modules)
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)
    ${TRUE}
    #do nothing, "auto" is ok
        ;;
  no)
    squid_opt_enable_diskio="no"
        ;;
  *)
    squid_opt_enable_diskio="yes"
    squid_disk_module_candidates=" `echo $enableval| sed -e 's/,/ /g;s/  */ /g'` "
    SQUID_CLEANUP_MODULES_LIST([squid_disk_module_candidates])
        ;;
  esac
])

# if requested to autodetect, find out what we have
if test $squid_opt_enable_diskio = "auto"; then
    squid_opt_enable_diskio="yes"
    SQUID_LOOK_FOR_MODULES([$srcdir/src/DiskIO],[squid_disk_module_candidates])
fi

AC_MSG_RESULT([${squid_disk_module_candidates:-none}])
SQUID_CHECK_EXISTING_MODULES([$srcdir/src/DiskIO],[squid_disk_module_candidates])
SQUID_DEFINE_UNQUOTED([USE_DISKIO],$squid_opt_enable_diskio,
    [DiskIO modules are expected to be available.])



dnl Some autoconf.h defines we might enable later...
AC_ARG_WITH(pthreads,AS_HELP_STRING([--without-pthreads],[Disable POSIX Threads]))
AC_ARG_WITH(aio, AS_HELP_STRING([--without-aio],[Do not use POSIX AIO. Default: auto-detect]))
AH_TEMPLATE(USE_DISKIO_AIO, [Whether POSIX AIO support is needed. Automatic])
AH_TEMPLATE(USE_DISKIO_DISKTHREADS, [Whether pthreads support is needed. Automatic])
USE_AIOPS_WIN32=0
squid_opt_use_aio=
squid_opt_use_diskthreads=
AIOLIB=

dnl Setup the module paths etc.
DISK_LIBS=
DISK_OS_LIBS=
DISK_MODULES=
DISK_LINKOBJS=
for module in $squid_disk_module_candidates none; do
  # maybe not needed
  if test "$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)
        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)
        squid_opt_use_diskthreads="yes"
        LIBPTHREADS=
        SQUID_STATE_SAVE([diskthreads_state],[SQUID_CFLAGS SQUID_CXXFLAGS])
        if test "$with_pthreads" != "no"; then
                dnl TODO: this needs to be extended to handle more systems and better
                dnl REF: http://www.openldap.org/lists/openldap-bugs/200006/msg00070.html
                dnl REF: http://autoconf-archive.cryp.to/acx_pthread.html
                case "$squid_host_os" in
                mingw)
                        USE_AIOPS_WIN32=1
                        AC_MSG_NOTICE([Windows threads support automatically enabled])
                        ;;
                freebsd)
                        SQUID_CFLAGS="$SQUID_CFLAGS -D_REENTRANT"
                        SQUID_CXXFLAGS="$SQUID_CXXFLAGS -D_REENTRANT"
                        if test "$GCC" = "yes" -a -z "$PRESET_LDFLAGS" ; then
                                LDFLAGS="$LDFLAGS -pthread"
                        fi
                        ;;
                solaris)
                    if test "$GCC" = "yes" ; then
                        SQUID_CFLAGS="$SQUID_CFLAGS -D_REENTRANT -pthreads"
                        SQUID_CXXFLAGS="$SQUID_CXXFLAGS -D_REENTRANT -pthreads"
                        AC_CHECK_LIB(pthread, pthread_create ,[LIBPTHREADS="-lpthread"],
                          [ AC_MSG_NOTICE(pthread library required but cannot be found.)
                            squid_opt_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_SEARCH_LIBS([pthread_create],[pthread thread],[
              LIBPTHREADS="" #in LIBS 
            ],[
              AC_MSG_NOTICE(pthread library required but cannot be found.)
              squid_opt_use_diskthreads="no"
            ])
                        fi
                        ;;
                *)
                        SQUID_CFLAGS="$SQUID_CFLAGS -D_REENTRANT"
                        SQUID_CXXFLAGS="$SQUID_CXXFLAGS -D_REENTRANT"
                        AC_CHECK_LIB(pthread, pthread_create ,[LIBPTHREADS="-lpthread"],
                                [ AC_MSG_NOTICE(pthread library required but cannot be found.)
                                  squid_opt_use_diskthreads="no"
                                ])
                        ;;
                esac
        else
                AC_MSG_NOTICE([Native pthreads support manually disabled.])
                squid_opt_use_diskthreads="no"
        fi
        if test "$squid_opt_use_diskthreads" = "yes" ; then
          AC_DEFINE(USE_DISKIO_DISKTHREADS, 1, [Whether pthreads support is needed. Automatic])
          AC_MSG_NOTICE([Enabling DiskThreads DiskIO module])
          DISK_LIBS="$DISK_LIBS libDiskThreads.a"
          DISK_OS_LIBS="$DISK_OS_LIBS $LIBPTHREADS"
          DISK_MODULES="$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_STATE_ROLLBACK([diskthreads_state])
        fi
        ;;

    AIO)
        dnl Check for POSIX AIO availability
        squid_opt_use_aio="yes"
        AIOLIB=
        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 "$have_aio_header" = "yes"; then
            AC_MSG_NOTICE([Native POSIX AIO support detected.])
            squid_opt_use_aio="yes"
          else
            dnl Windows does things differently. We provide wrappers.
            dnl TODO: Windows really needs its own DiskIO module or its Overlaped IO
            case "$host_os" in
              mingw|mingw32)
                squid_opt_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.])
                squid_opt_use_aio="no"
              ;;
            esac
          fi
        else
          AC_MSG_NOTICE([POSIX AIO support manually disabled.])
          squid_opt_use_aio="no"
        fi
        dnl Use the POSIX AIO pieces if we actually need them.
        if test "$squid_opt_use_aio" = "yes" ; then
          AC_DEFINE(USE_DISKIO_AIO, 1, [Whether POSIX AIO support is needed. Automatic])
          DISK_MODULES="$DISK_MODULES AIO"
          DISK_LIBS="$DISK_LIBS libAIO.a"
          DISK_LINKOBJS="$DISK_LINKOBJS DiskIO/AIO/AIODiskIOModule.o"
          case "$host_os" in
            mingw|mingw32)
                USE_AIO_WIN32=1
                AC_MSG_NOTICE([Replacing AIO DiskIO module with: Windows overlapped I/O support])
                ;;
            *)
                AC_MSG_NOTICE([Enabling AIO DiskIO module])
                DISK_OS_LIBS="$DISK_OS_LIBS $AIOLIB"
                ;;
          esac
        else
          AC_DEFINE(USE_DISKIO_AIO, 0, [Whether POSIX AIO support is needed. Automatic])
          AC_MSG_NOTICE([AIO DiskIO Module disabled. Missing POSIX AIO support.])
        fi
        ;;

    Blocking)
        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: $DISK_MODULES])
AC_SUBST(DISK_MODULES)
AC_SUBST(DISK_LIBS)
AC_SUBST(DISK_PROGRAMS)
AC_SUBST(DISK_LINKOBJS)
AC_SUBST(DISK_OS_LIBS)
AM_CONDITIONAL([USE_AIOPS_WIN32], [test "$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.
squid_opt_enable_storeio=auto
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)
    squid_opt_enable_storeio=auto
        ;;
  no)
    squid_opt_enable_storeio=no
        ;;
  *)
    squid_opt_enable_storeio=yes
        squid_storeio_module_candidates="`echo $enableval| sed -e 's/,/ /g;s/  */ /g'`"
    # ufs is really always needed as it has low-level routines
    # if it's a dupe it will be cleaned-up later
    squid_storeio_module_candidates="$squid_storeio_module_candidates ufs"
        ;;
  esac
])
if test "$squid_opt_enable_storeio" = "auto"; then
  squid_opt_enable_storeio=yes
  AC_MSG_CHECKING([for available StoreIO modules])
  SQUID_LOOK_FOR_MODULES([$srcdir/src/fs],[squid_storeio_module_candidates])
  # disable coss
  squid_storeio_module_candidates=`echo $squid_storeio_module_candidates|sed 's/coss//'`
  AC_MSG_RESULT([$squid_storeio_module_candidates])
fi

SQUID_CLEANUP_MODULES_LIST([squid_storeio_module_candidates])
SQUID_CHECK_EXISTING_MODULES([$srcdir/src/fs],[squid_storeio_module_candidates])
AC_MSG_NOTICE([Store modules built: $squid_storeio_module_candidates])

for fs in $squid_storeio_module_candidates none; do
    case "$fs" in
    diskd)
        if test "$squid_disk_module_candidates_Blocking" != "yes" -a \
        "$squid_disk_module_candidates_DiskDaemon" != "yes" ; then
          AC_MSG_ERROR([Storage diskd module requires DiskIO module: Blocking or DiskDaemon])
        fi
        ;;
    aufs)
        if test "$squid_disk_module_candidates_Blocking" != "yes" -a \
        "$squid_disk_module_candidates_DiskThreads" != "yes" ; then
          AC_MSG_ERROR([Storage module aufs requires DiskIO module: Blocking or DiskThreads])
        fi
        ;;
    coss)
      AC_MSG_WARN([COSS Support is not stable yet in Squid-3. Please do not use.\a])
        if ! test "$squid_disk_module_candidates_AIO" = "yes"; then
          AC_MSG_ERROR([COSS requires POSIX AIO which is not available.])
        fi
        dnl
        dnl Automake om MinGW needs explicit exe extension
        dnl for STORE_TESTS substition
        dnl
        STORE_TESTS="$STORE_TESTS tests/testCoss$EXEEXT"
        ;;
    ufs)
        STORE_TESTS="$STORE_TESTS tests/testUfs$EXEEXT"
    esac
done

dnl hack: need to define those even if not used in the build system to
dnl make sure that global FS objects are linked to the squid binary.
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 squid_storeio_module_candidates, 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 $squid_storeio_module_candidates; do
    STORE_LIBS_TO_BUILD="$STORE_LIBS_TO_BUILD lib${fs}.la"
    STORE_LIBS_TO_ADD="$STORE_LIBS_TO_ADD fs/lib${fs}.la"
    SQUID_TOUPPER_VAR_CONTENTS([fs])
    AC_DEFINE_UNQUOTED(HAVE_FS_${fs}, 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 $enableval in
  yes)
    SQUID_LOOK_FOR_MODULES([$srcdir/src/repl],[REPL_POLICIES])
        ;;
  no)
        ;;
  *)
        REPL_POLICIES="`echo $enableval| sed -e 's/,/ /g;s/  */ /g'`"
        ;;
  esac
])
if test -n "$REPL_POLICIES"; then
    SQUID_CHECK_EXISTING_MODULES([$srcdir/src/repl],[REPL_POLICIES])
    AC_MSG_NOTICE([Removal policies to build: $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
squid_opt_use_adaptation=no

squid_opt_use_esi=yes
AH_TEMPLATE([USE_SQUID_ESI],
            [Define to enable the ESI processor and Surrogate header support])
AC_ARG_ENABLE(esi,
  AS_HELP_STRING([--enable-esi],
                 [Enable ESI for accelerators. Benefits from expat or libxml2.
                  Enabling ESI will cause squid reverse proxies to be capable
                  of the Edge Acceleration Specification (www.esi.org).]),
                    [squid_opt_use_esi=$enableval], [squid_opt_use_esi=no])
HAVE_LIBEXPAT=0
EXPATLIB=
HAVE_LIBXML2=0
XMLLIB=
if test "$squid_opt_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])
else
  AC_MSG_NOTICE([Disabling ESI processor])
fi

# ESI support libraries: expat
AC_ARG_WITH(expat, AS_HELP_STRING([--without-expat],[Do not use expat for ESI. Default: auto-detect]))
if test "$squid_opt_use_esi" = "yes" -a "$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 expat is not able to be found.])
  fi
fi

AC_ARG_WITH(libxml2, AS_HELP_STRING([--without-libxml2],[Do not use libxml2 for ESI. Default: auto-detect]))
if test "$squid_opt_use_esi" = "yes" -a "$with_libxml2" != "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_libxml2" = "yes" && test "$HAVE_LIBXML2" != "1" ; then
    AC_MSG_ERROR([Required library libxml2 is not able to be found.])
  fi
fi

AM_CONDITIONAL(USE_ESI, test "$squid_opt_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)

# icap argument handling
AC_ARG_ENABLE(icap-client,
  AS_HELP_STRING([--enable-icap-client],[Enable the ICAP client.]),
                     [squid_opt_use_icap_client=$enableval], [squid_opt_use_icap_client=no])
SQUID_DEFINE_UNQUOTED([ICAP_CLIENT],$squid_opt_use_icap_client,
     [Enable ICAP client features in Squid])
AM_CONDITIONAL(USE_ICAP_CLIENT, [test "$squid_opt_use_icap_client" = "yes" ])
if test "$squid_opt_use_icap_client" = "yes" ; then
  ICAP_LIBS="icap/libicap.la"
  squid_opt_use_adaptation=yes
else
  ICAP_LIBS=""
fi
AC_SUBST(ICAP_LIBS)

squid_opt_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 "${enableval}" in
       yes|no) squid_opt_use_ecap=$enableval ;;
       *) AC_MSG_ERROR(bad value ${enableval} for --enable-ecap) ;;
    esac
AC_MSG_RESULT([$squid_opt_use_ecap, explicitly])
    ], [
        squid_opt_use_ecap=no;
        AC_MSG_RESULT([$squid_opt_use_ecap, implicitly])
    ]
)

dnl Perform configuration consistency checks for eCAP
ECAPLIB=""
if test $squid_opt_use_ecap = yes;
then
    dnl eCAP support requires loadable modules, which are enabled by default
    if test "$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 $squid_opt_use_ecap = yes)
if test $squid_opt_use_ecap = yes;
then
    AC_DEFINE(USE_ECAP,1,[Enable eCAP support])
    ECAP_LIBS="ecap/libecap.la $ECAP_LIBS"
    squid_opt_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 $squid_opt_use_adaptation = yes)
if test $squid_opt_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 "$enableval" = "yes" ; then
if test "$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
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]), [ 
SQUID_YESNO([$enableval],
            [unrecognized argument to --enable-useragent-log: $enableval])
  enable_useragent_log=$enableval
])
SQUID_DEFINE_UNQUOTED(USE_USERAGENT_LOG,${enable_useragent_log:=no},
    [If you want to log User-Agent request header values, define this.])
AC_MSG_NOTICE([User-Agent logging enabled: $enable_useragent_log])

AC_ARG_ENABLE(referer-log,
  AS_HELP_STRING([--enable-referer-log],[Enable logging of Referer header]), [ 
SQUID_YESNO([$enableval],
            [unrecognized argument to --enable-referer-log: $enableval])
])
SQUID_DEFINE_UNQUOTED(USE_REFERER_LOG,${enable_referer_log:=no},
       [If you want to log Referer request header values, define this.
        By default, they are written to referer.log in the Squid logdir.
        This feature is deprecated in favour of custom log formats])
AC_MSG_NOTICE([Referer logging enabled: $enable_referer_log])

AC_ARG_ENABLE(wccp,
  AS_HELP_STRING([--disable-wccp],[Disable Web Cache Coordination Protocol]), [
SQUID_YESNO([$enableval],[unrecognized argument to --disable-wccp: $enableval])
])
SQUID_DEFINE_UNQUOTED(USE_WCCP, ${enable_wccp:=yes}, [Define to enable WCCP])
AC_MSG_NOTICE([Web Cache Coordination Protocol enabled: $enable_wccp])

AC_ARG_ENABLE(wccpv2,
  AS_HELP_STRING([--disable-wccpv2],
                 [Disable Web Cache Coordination V2 Protocol]), [ 
SQUID_YESNO([$enableval],
            [unrecognized argument to --disable-wccpv2: $enableval])
])
SQUID_DEFINE_UNQUOTED(USE_WCCPv2,${enable_wccpv2:=yes},
            [Define to enable WCCP V2])
AC_MSG_NOTICE([Web Cache Coordination V2 Protocol enabled: $enable_wccpv2])

AC_ARG_ENABLE(kill-parent-hack,
  AS_HELP_STRING([--enable-kill-parent-hack],[Kill parent on shutdown]), [ 
SQUID_YESNO([$enableval],
            [unrecognized argument to --enable-kill-parent-hack: $enableval])
])
SQUID_DEFINE_UNQUOTED(KILL_PARENT_OPT,${enable_kill_parent_hack:=no},
                   [A dangerous feature which causes Squid to kill its parent 
                    process (presumably the RunCache script) upon receipt 
                    of SIGTERM or SIGINT. Deprecated, Use with caution.])
AC_MSG_NOTICE([Kill parent on shutdown hack enabled: $enable_kill_parent_hack])

AC_ARG_ENABLE(snmp,
  AS_HELP_STRING([--disable-snmp],[Disable SNMP monitoring support]), [
  SQUID_YESNO([$enableval],
              [unrecognized argument to --disable-snmp: $enableval])
])
SQUID_DEFINE_UNQUOTED(SQUID_SNMP,${enable_snmp:=yes},
   [Define to enable SNMP monitoring of Squid])
AM_CONDITIONAL(USE_SNMP, [test "$enable_snmp" = "yes"])
if test "$enable_snmp" = "yes"; then
    SNMPLIB='../snmplib/libsnmp.a'
    makesnmplib=snmplib
fi
AC_MSG_NOTICE([SNMP support enabled: $enable_snmp])
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
])

AC_ARG_ENABLE(eui,
  AS_HELP_STRING([--disable-eui],
                 [Enable use of ARP / MAC/ EUI (ether address)]), [
SQUID_YESNO([$enableval],[--disable-eui expects no arguments])
])
if test ${enable_eui:=yes} = "yes" ; then
     case "$squid_host_os" in
        linux|solaris|freebsd|openbsd|netbsd)
        ${TRUE}
            ;;
        cygwin|mingw)
                EUILIB="-liphlpapi"
            ;;
        *)
            AC_MSG_WARN([EUI support probably will not work on host $host.])
            ;;
     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 \
        )
fi
AC_MSG_NOTICE([EUI (MAC address) controls enabled: $enable_eui])
SQUID_DEFINE_UNQUOTED(USE_SQUID_EUI,$enable_eui,
   [Define this to include code which lets you use ethernet addresses. This code uses API initially defined in 4.4-BSD.])
AM_CONDITIONAL(USE_SQUID_EUI, [test "$enable_eui" = "yes" ])


AC_ARG_ENABLE(htcp,
  AS_HELP_STRING([--disable-htcp],[Disable HTCP protocol support]), [
SQUID_YESNO([$enableval],
            [unrecognized argument to --disable-htcp: $enableval])
])
SQUID_DEFINE_UNQUOTED([USE_HTCP],${enable_htcp:=yes},
   [Define this to include code for the Hypertext Cache Protocol (HTCP)])
AM_CONDITIONAL(ENABLE_HTCP, [test "$enable_htcp" = "yes"])
AC_MSG_NOTICE([HTCP support enabled: $enable_htcp])


# SSL is not enabled by default.
# Default is to use OpenSSL when available
AC_ARG_ENABLE(ssl,
  AS_HELP_STRING([--enable-ssl],
                 [Enable ssl gatewaying support using OpenSSL]), [
SQUID_YESNO([$enableval],
            [unrecognized argument to --enable-ssl: $enableval])
])
# USE_OPENSSL is AC_DEFINED later
# default for ssl is set here
if test ${enable_ssl:=no} = "yes" ; then
    if test "$squid_host_os" = "mingw" ; then
        SSLLIB='-lssleay32 -leay32 -lgdi32'
    else
        SSLLIB='-lssl -lcrypto'
    fi
fi
AM_CONDITIONAL(ENABLE_SSL,[ test $enable_ssl = "yes" ])
AC_MSG_NOTICE([SSL gatewaying support enabled: $enable_ssl])

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|no) AC_MSG_ERROR([--with-openssl requires a path argument])
    ;;
  *)
    if test ! -d $withval ; then
      AC_MSG_ERROR([--with-openssl path does not point to a directory])
    fi
    SSLLIBDIR="$with_openssl/lib"
    CPPFLAGS="-I$with_openssl/include $CPPFLAGS"
    enable_ssl=yes
  esac
])
AC_MSG_NOTICE([Using OpenSSL MD5 implementation: $enable_ssl])
SQUID_DEFINE_UNQUOTED(USE_SSL,$enable_ssl,
   [Define this to include code for SSL gatewaying support])
SQUID_DEFINE_UNQUOTED(USE_OPENSSL,$enable_ssl,
   [Define this to make use of the OpenSSL libraries for MD5 calculation rather than Squid-supplied MD5 implementation or if building with SSL encryption])
if test "$enable_ssl" = "yes"; then
  if test -z "$SSLLIB"; then
    SSLLIB="-lcrypto" # for MD5 routines
  fi
  # This is a workaround for RedHat 9 brain damage..
  if test -d /usr/kerberos/include && test -z "$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]), [
  SQUID_YESNO([$enableval],[unrecognized argument to --enable-forw-via-db: $enableval])
])
SQUID_DEFINE_UNQUOTED(FORW_VIA_DB,${enable_forw_via_db:=no},
                      [Enable Forw/Via database])
AC_MSG_NOTICE([Forw/Via database enabled: $enable_forw_via_db])

AC_ARG_ENABLE(cache-digests,
  AS_HELP_STRING([--enable-cache-digests],
   [Use Cache Digests. See http://wiki.squid-cache.org/SquidFaq/CacheDigests]),
[
 SQUID_YESNO($enableval,
   [unrecognized argument to --enable-cache-digests: $enableval])
])
SQUID_DEFINE_UNQUOTED(USE_CACHE_DIGESTS,${enable_cache_digests:=no},
  [Use Cache Digests for locating objects in neighbor caches.])
AC_MSG_NOTICE([Cache Digests enabled: $enable_cache_digests])


dnl Size of COSS memory buffer
squid_opt_coss_membuf_size=1048576
AC_ARG_WITH(coss-membuf-size,
  AS_HELP_STRING([--with-coss-membuf-size=size],
             [COSS membuf size (default $squid_opt_coss_membuf_size bytes)]), [
case $withval in
  [[0-9]]*) squid_opt_coss_membuf_size=$withval ;;
  *) AC_MSG_ERROR([--with-coss-membuf-size expects a numeric argument]) ;;
esac
])
AC_MSG_NOTICE([Setting COSS membuf size to $squid_opt_coss_membuf_size bytes])
AC_DEFINE_UNQUOTED(COSS_MEMBUF_SZ, $squid_opt_coss_membuf_size,
   [Default COSS membuf size])

################################
# check for netio plugin stuff #
################################
dnl order of these options handling is relevant in case the user
dnl supplies more than one --enable option. Options handled later
dnl override those handled earlier for io loop method manual override
AC_ARG_ENABLE(select,
  AS_HELP_STRING([--disable-select],[Disable select(2) support.]),
[
SQUID_YESNO($enableval,[--disable-select takes no extra argument])
test $enableval = "yes" && squid_opt_io_loop_engine="select"
])
AC_MSG_NOTICE([enabling select syscall for net I/O: ${enable_select:=auto}])

AC_ARG_ENABLE(poll,
  AS_HELP_STRING([--disable-poll],[Disable poll(2) support.]),
[
SQUID_YESNO($enableval,[--disable-poll takes no extra argument])
test $enableval = "yes" && squid_opt_io_loop_engine="poll"
])
AC_MSG_NOTICE([enabling poll syscall for net I/O: ${enable_poll:=auto}])

# kqueue support is still experiemntal and unstable. Not enabled by default.
AC_ARG_ENABLE(kqueue,
  AS_HELP_STRING([--enable-kqueue],
                 [Enable kqueue(2) support (experimental).]), [
SQUID_YESNO($enableval,[--enable-kqueue takes no extra argument])
])
if test ${enable_kqueue:=no} = "yes" ; then
  AC_CHECK_HEADERS([sys/event.h],[],
    [ AC_MSG_ERROR([kqueue support requires sys/event.h header file.]) ])
  squid_opt_io_loop_engine="kqueue"
fi
AC_MSG_NOTICE([enabling kqueue for net I/O: $enable_kqueue])

dnl Enable epoll()
AC_ARG_ENABLE(epoll,
  AS_HELP_STRING([--disable-epoll],[Disable Linux epoll(2) support.]),
[
SQUID_YESNO($enableval,[--disable-epoll takes no extra argument])
test $enableval = "yes" && squid_opt_io_loop_engine="epoll"
])
AC_MSG_NOTICE([enabling epoll syscall for net I/O: ${enable_epoll:=auto}])

# auto-detect and verify epoll header and library present and working
# logic mapping and loop method selection are performed later
if test "$enable_epoll" != "no" ; then

  # check if libs are needed to support epoll
  # note: this code block seems quite generic. Could it be extracted
  #   into a squid specific configure function?
  SQUID_STATE_SAVE(squid_epoll_state)
  AC_SEARCH_LIBS(epoll_ctl,[epoll])
  if test "$ac_cv_search_epoll_ctl" = "no" ; then
    enable_epoll=no #disable. Needed code not found
  elif test "$ac_cv_search_epoll_ctl" = "none required" ; then
    EPOLL_LIBS=""
  else
    EPOLL_LIBS=$ac_cv_search_epoll_ctl
  fi
  AC_SUBST(EPOLL_LIBS)
  SQUID_STATE_ROLLBACK(squid_epoll_state) #de-pollute LIBS

  # 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
    SQUID_CHECK_EPOLL
  fi

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


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.]), [
  SQUID_YESNO([$enableval],
         [unrecognized argument to --disable-http-violations: $enableval])
])
SQUID_DEFINE_UNQUOTED(HTTP_VIOLATIONS, ${enable_http_violations:=yes},
  [Define to enable code which volates the HTTP standard specification])
AC_MSG_NOTICE([HTTP violations support enabled: $enable_http_violations])

# IPFW Transparent Proxy
AC_ARG_ENABLE(ipfw-transparent,
  AS_HELP_STRING([--enable-ipfw-transparent],
                 [Enable Transparent Proxy support for systems
                  using FreeBSD IPFW-style firewalling.]), [
  SQUID_YESNO([$enableval],
      [unrecognized argument to --enable-ipfw-transparent: $enableval])
])
SQUID_DEFINE_UNQUOTED(IPFW_TRANSPARENT,${enable_ipfw_transparent:=no},
  [Enable support for Transparent Proxy on systems using FreeBSD IPFW-style firewalling.])
AC_MSG_NOTICE([FreeBSD IPFW-based transparent proxying enabled: $enable_ipfw_transparent])

# IP-Filter Transparent Proxy
AC_ARG_ENABLE(ipf-transparent,
  AS_HELP_STRING([--enable-ipf-transparent],
     [Enable Transparent Proxy support using IPFilter-style firewalling]), [
  SQUID_YESNO([$enableval],
      [unrecognized argument to --enable-ipf-transparent: $enableval])
])
#will be AC_DEFINE'd later, after checking for appropriate infrastructure
#IPF currently broken. Default-disabled for now.
AC_MSG_NOTICE([IPF-based transparent proxying requested: ${enable_ipf_transparent:=no}])

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.]), [
  SQUID_YESNO([$enableval],
              [unrecognized argument to --enable-pf-transparent: $enableval])
])
#will be AC_DEFINE'd later, after checking for appropriate infrastructure
AC_MSG_NOTICE([PF-based transparent proxying requested: ${enable_pf_transparent:=auto}])

# Linux Netfilter Transparent Proxy
AC_ARG_ENABLE(linux-netfilter,
  AS_HELP_STRING([--enable-linux-netfilter],
                 [Enable Transparent Proxy support for Linux (Netfilter)]), [
  SQUID_YESNO([$enableval],
              [unrecognized argument to --enable-linux-netfilter: $enableval])
])
AC_MSG_NOTICE([Linux Netfilter support requested: ${enable_linux_netfilter:=auto}])
#will be AC_DEFINE'd later, after checking for appropriate infrastructure

dnl Enable Large file support
buildmodel=""
squid_opt_enable_large_files=no

AC_ARG_WITH(large-files,
  AS_HELP_STRING([--with-large-files],[Enable support for large files (logs etc).]),
[ if test "x$withval" = "xyes"; then
        squid_opt_enable_large_files=yes
  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 "$squid_opt_enable_large_files" = "yes" -a -z "$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 "$buildmodel"; then
    AC_MSG_WARN([No suitable build environment found for large files. Trying to use _FILE_OFFSET_BITS=64])
  fi
fi
case "$buildmodel" in
default|"")
        if test "$squid_opt_enable_large_files" = "yes" ; 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` $LDFLAGS"
        if "$squid_host_os" = "solaris" ; then

# On Solaris getconf returns for CFLAGS -xarch=generic64, -Xa and -Usun options, and
# for LDFLAGS -xarch=generic64, but:
#   "-Xa" is supported only by Sun cc, so we need to remove it when using gcc
#   For gcc "-xarch=generic64" must be replaced with "-m64"
#   The 'sun' define is needed by ipfilter includes, so we must remove "-Usun"
    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//'`"
  fi
esac

dnl Enable Leak Finding Functions
squid_opt_enable_leakfinder=no
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.]), [ 
  SQUID_YESNO([$enableval],[unrecognized argument to --enable-leakfinder: $enableval])
  squid_opt_enable_leakfinder=$enableval
])
AC_MSG_NOTICE([Leak Finder enabled: $squid_opt_enable_leakfinder])
SQUID_DEFINE_UNQUOTED(USE_LEAKFINDER,$squid_opt_enable_leakfinder,
  [Enable code for assisting in finding memory leaks. Not for the faint of heart])
AM_CONDITIONAL(MAKE_LEAKFINDER, [test "$squid_opt_enable_leakfinder" = "yes"])


squid_opt_follow_xff="yes"
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.]), [
  SQUID_YESNO([$enableval],[unrecognized argument to --enable-follow-x-forwarded-for: $enableval])
  squid_opt_follow_xff=$enableval
])
AC_MSG_NOTICE([Support for X-Forwarded-For enabled: $squid_opt_follow_xff])
SQUID_DEFINE_UNQUOTED([FOLLOW_X_FORWARDED_FOR],$squid_opt_follow_xff,
  [Enable following X-Forwarded-For headers])

squid_opt_use_ident="yes"
AC_ARG_ENABLE(ident-lookups,
  AS_HELP_STRING([--disable-ident-lookups],
                 [Remove code that supports performing Ident (RFC 931) lookups.]), [
  SQUID_YESNO([$enableval],[unrecognized argument to --disable-ident-lookups: $enableval])
  squid_opt_use_ident=$enableval
])
AC_MSG_NOTICE([Support for Ident lookups enabled: $squid_opt_use_ident])
SQUID_DEFINE_UNQUOTED(USE_IDENT,$squid_opt_use_ident,[Support for Ident (RFC 931) lookups])

squid_opt_use_dnsserver="no"
AH_TEMPLATE(USE_DNSSERVERS,
    [Use dnsserver processes instead of the internal DNS protocol support])
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 "$enableval" = "no" ; then
    AC_MSG_WARN([Disabling Internal DNS queries])
    squid_opt_use_dnsserver="yes"
    AC_DEFINE(USE_DNSSERVERS,1)
  else
    AC_DEFINE(USE_DNSSERVERS,0)
  fi
])
AM_CONDITIONAL([USE_DNSSERVER],[test "$squid_opt_use_dnsserver" = "yes" ])


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 "$enableval" != "none" -a "$enableval" != "no" ; then
    if test -f $enableval; then
      OPT_DEFAULT_HOSTS=$enableval
    else
      AC_MSG_WARN([Unable to find $enableval])
    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)

# Select auth schemes modules to build
AC_ARG_ENABLE(auth,
  AS_HELP_STRING([--enable-auth],
                 [Build global support for authentication. The list of schemes
                  and helpers to be enabled is defined elsewhere]), [
SQUID_YESNO([$enableval],
            [unrecognized argument to --enable-auth: $enableval])
])
AC_MSG_NOTICE([Authentication support enabled: ${enable_auth:=yes}])
SQUID_DEFINE_UNQUOTED([USE_AUTH],$enable_auth,
   [Enable support for authentication])
AUTH_MODULES=""

AC_ARG_ENABLE(auth-basic,
  AS_HELP_STRING([--enable-auth-basic="list of helpers"],
     [Enable the basic authentication scheme, and build the specified helpers.
      Not providing an explicit list of helpers will attempt build of
      all possible helpers. Default is to do so.
      To disable the basic authentication scheme, use --disable-auth-basic.
      To enable but build no helpers, specify "none".
      To see available helpers, see the helpers/basic_auth directory. ]),[
#nothing to do really
])
#not specified. Inherit global
if test "x$enable_auth_basic" = "x"; then
    enable_auth_basic=$enable_auth
fi
#conflicts with global
if test "$enable_auth_basic" != "no" -a "$enable_auth" = "no" ; then
    AC_MSG_ERROR([Basic auth requested but auth disabled])
fi
#define list of modules to build
if test "$enable_auth_basic" = "yes" ; then
    SQUID_LOOK_FOR_MODULES([$srcdir/helpers/basic_auth],[enable_auth_basic])
fi
#handle the "none" special case
if test "x$enable_auth_basic" = "xnone" ; then
    enable_auth_basic=""
fi
BASIC_AUTH_HELPERS=""
#enable_auth_basic contains either "no" or the list of modules to be built
enable_auth_basic="`echo $enable_auth_basic| sed -e 's/,/ /g;s/  */ /g'`"
if test "$enable_auth_basic" != "no" ; then
    AUTH_MODULES="$AUTH_MODULES basic"
    AC_DEFINE([HAVE_AUTH_MODULE_BASIC],1,[Basic auth module is built])
    for helper in $enable_auth_basic
    do
    dir="$srcdir/helpers/basic_auth/$helper"
    if test -f $dir/config.test && sh $dir/config.test "$@"; then
      BASIC_AUTH_HELPERS="$BASIC_AUTH_HELPERS $helper"
      # special case
      if test "$helper" = "SASL" ; then
        squid_require_sasl=yes
      fi
    elif test -d $srcdir/helpers/basic_auth/$helper ; then
      AC_MSG_NOTICE([Basic auth helper $helper ... found but cannot be built])
    fi
    done
fi
AC_MSG_NOTICE([Basic auth helpers to be built: $BASIC_AUTH_HELPERS])
AC_SUBST(BASIC_AUTH_HELPERS)

AC_ARG_ENABLE(auth-ntlm,
  AS_HELP_STRING([--enable-auth-ntlm="list of helpers"],
     [Enable the NTLM authentication scheme, and build the specified helpers.
      Not providing an explicit list of helpers will attempt build of
      all possible helpers. Default is to do so.
      To disable the NTLM authentication scheme, use --disable-auth-ntlm.
      To enable but build no helpers, specify "none".
      To see available helpers, see the helpers/ntlm_auth directory. ]),[
])
if test "x$enable_auth_ntlm" = "x"; then
    enable_auth_ntlm=$enable_auth
fi
#conflicts with global
if test "x$enable_auth_ntlm" != "xno" -a "x$enable_auth" = "xno" ; then
    AC_MSG_ERROR([NTLM auth requested but auth disabled])
fi
#define list of modules to build
if test "x$enable_auth_ntlm" = "xyes" ; then
    SQUID_LOOK_FOR_MODULES([$srcdir/helpers/ntlm_auth],[enable_auth_ntlm])
fi
#handle the "none" special case
if test "x$enable_auth_ntlm" = "xnone" ; then
    enable_auth_ntlm=""
fi
NTLM_AUTH_HELPERS=""
enable_auth_ntlm="`echo $enable_auth_ntlm| sed -e 's/,/ /g;s/  */ /g'`"
if test "$enable_auth_ntlm" != "no" ; then
    AUTH_MODULES="$AUTH_MODULES ntlm"
    AC_DEFINE([HAVE_AUTH_MODULE_NTLM],1,[NTLM auth module is built])
    for helper in $enable_auth_ntlm ; do
        dir="$srcdir/helpers/ntlm_auth/$helper"
        if test -f $dir/config.test && sh $dir/config.test "$@"; then
            NTLM_AUTH_HELPERS="$NTLM_AUTH_HELPERS $helper"
        elif test -d $srcdir/helpers/ntlm_auth/$helper ; then
            AC_MSG_NOTICE([NTLM auth helper $helper ... found but cannot be built])
        fi
    done
fi
AC_MSG_NOTICE([NTLM auth helpers built: $NTLM_AUTH_HELPERS])
AC_SUBST(NTLM_AUTH_HELPERS)

AC_ARG_ENABLE(auth-negotiate,
  AS_HELP_STRING([--enable-auth-negotiate="list of helpers"],
     [Enable the Negotiate authentication scheme, and build the specified 
      helpers.
      Not providing an explicit list of helpers will attempt build of
      all possible helpers. Default is to do so.
      To disable the Negotiate authentication scheme, 
      use --disable-auth-negotiate.
      To enable but build no helpers, specify "none".
      To see available helpers, see the helpers/negotiate_auth directory. ]),[
#nothing to do, really
])
if test "x$enable_auth_negotiate" = "x"; then
    enable_auth_negotiate=$enable_auth
fi
#conflicts with global
if test "x$enable_auth_negotiate" != "xno" -a "x$enable_auth" = "xno" ; then
    AC_MSG_ERROR([Negotiate auth requested but auth disabled])
fi
#define list of modules to build
if test "x$enable_auth_negotiate" = "xyes" ; then
    SQUID_LOOK_FOR_MODULES([$srcdir/helpers/negotiate_auth],[enable_auth_negotiate])
fi
#handle the "none" special case
if test "x$enable_auth_negotiate" = "xnone" ; then
    enable_auth_negotiate=""
fi
NEGOTIATE_AUTH_HELPERS=""
enable_auth_negotiate="`echo $enable_auth_negotiate| sed -e 's/,/ /g;s/  */ /g'`"
if test "$enable_auth_negotiate" != "no" ; then
    AUTH_MODULES="$AUTH_MODULES negotiate"
    AC_DEFINE([HAVE_AUTH_MODULE_NEGOTIATE],1,[Negotiate auth module is built])
    for helper in $enable_auth_negotiate ; do
        dir="$srcdir/helpers/negotiate_auth/$helper"
        if test -f $dir/config.test && sh $dir/config.test "$@"; then
            NEGOTIATE_AUTH_HELPERS="$NEGOTIATE_AUTH_HELPERS $helper"
        elif test -d $srcdir/helpers/negotiate_auth/$helper ; then
            AC_MSG_NOTICE([Negotiate auth helper $helper ... found but cannot be built])
        fi
    done
fi
AC_MSG_NOTICE([Negotiate auth helpers built: $NEGOTIATE_AUTH_HELPERS])
AC_SUBST(NEGOTIATE_AUTH_HELPERS)

AC_ARG_ENABLE(auth-digest,
  AS_HELP_STRING([--enable-auth-digest="list of helpers"],
     [Enable the Digest authentication scheme, and build the specified helpers.
      Not providing an explicit list of helpers will attempt build of
      all possible helpers. Default is to do so.
      To disable the Digest authentication scheme, use --disable-auth-digest.
      To enable but build no helpers, specify "none".
      To see available helpers, see the helpers/digest_auth directory. ]),[
#nothing to do, really
])
if test "x$enable_auth_digest" = "x"; then
    enable_auth_digest=$enable_auth
fi
#conflicts with global
if test "x$enable_auth_digest" != "xno" -a "x$enable_auth" = "xno" ; then
    AC_MSG_ERROR([Digest auth requested but auth disabled])
fi
#define list of modules to build
if test "x$enable_auth_digest" = "xyes" ; then
    SQUID_LOOK_FOR_MODULES([$srcdir/helpers/digest_auth],[enable_auth_digest])
fi
#handle the "none" special case
if test "x$enable_auth_digest" = "xnone" ; then
    enable_auth_digest=""
fi
DIGEST_AUTH_HELPERS=""
enable_auth_digest="`echo $enable_auth_digest| sed -e 's/,/ /g;s/  */ /g'`"
if test "$enable_auth_digest" != "no" ; then
    AUTH_MODULES="$AUTH_MODULES digest"
    AC_DEFINE([HAVE_AUTH_MODULE_DIGEST],1,[Digest auth module is built])
    for helper in $enable_auth_digest ; do
        dir="$srcdir/helpers/digest_auth/$helper"
        if test -f $dir/config.test && sh $dir/config.test "$@"; then
            DIGEST_AUTH_HELPERS="$DIGEST_AUTH_HELPERS $helper"
        elif test -d $srcdir/helpers/digest_auth/$helper ; then
            AC_MSG_NOTICE([Digest auth helper $helper ... found but cannot be built])
        fi
    done
fi
AC_MSG_NOTICE([Digest auth helpers built: $DIGEST_AUTH_HELPERS])
AC_SUBST(DIGEST_AUTH_HELPERS)

dnl Authentication libraries to build
dnl This list will not be needed when each auth library has its own Makefile
dnl this is to be placed AFTER each auth modile's handler
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 Select logging daemon helpers to build
squid_opt_logdaemon_helpers="auto"
AC_ARG_ENABLE(log-daemon-helpers,
  AS_HELP_STRING([--enable-log-daemon-helpers="list of helpers"],
                 [This option selects which logging daemon helpers to 
                  build and install as part of the normal build process
                  For a list of available helpers see the helpers/log_daemon
                  directory.]),[
case "$enableval" in
  yes) : ;;
  no)  squid_opt_logdaemon_helpers="" ;;
  *)   squid_opt_logdaemon_helpers="`echo $enableval| sed -e 's/,/ /g;s/  */ /g'`" ;;
  esac
])
if test "$squid_opt_logdaemon_helpers" = "auto" ; then
  squid_opt_logdaemon_helpers=""
  SQUID_LOOK_FOR_MODULES([$srcdir/helpers/log_daemon],[squid_opt_logdaemon_helpers])
fi
for helper in $squid_opt_logdaemon_helpers ; do
  dir="$srcdir/helpers/log_daemon/$helper"
  if test -f $dir/config.test && sh $dir/config.test "$@"; then
    LOG_DAEMON_HELPERS="$LOG_DAEMON_HELPERS $helper"
  elif test -d $srcdir/helpers/log_daemon/$helper ; then
    AC_MSG_NOTICE([Log daemon helper $helper ... found but cannot be built])
  fi
done
AC_MSG_NOTICE([Log daemon helpers built: $LOG_DAEMON_HELPERS])
AC_SUBST(LOG_DAEMON_HELPERS)

dnl
dnl Check Kerberos/GSSAPI/SPNEGO
dnl
SQUID_STATE_SAVE([krbsave])

AC_ARG_WITH(krb5-config,
 [  --with-krb5-config=PATH specify path to krb5-config @<:@default=detect@:>@],
[
  case "$withval" in
        yes) unset krb5confpath ;;
        no)  krb5confpath=no ;;
        *)   krb5confpath=$withval ;;
        esac
])
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)
        AC_CHECK_HEADERS(profile.h)
    fi
    AC_CHECK_HEADERS(krb5.h com_err.h et/com_err.h)

    SQUID_CHECK_KRB5_SOLARIS_BROKEN_KRB5_H
    if test x"$squid_cv_broken_krb5_h" = x"yes"; then
       AC_DEFINE(HAVE_BROKEN_SOLARIS_KRB5_H, 1, [Define to 1 if krb5.h is broken for C++])
    fi

    ac_com_error_message=no
    if test "x$ac_cv_header_com_err_h" == "xyes" ; then
        AC_EGREP_HEADER(error_message,com_err.h,ac_com_error_message=yes)
    elif test "x$ac_cv_header_et_com_err_h" == "xyes" ; then
        AC_EGREP_HEADER(error_message,et/com_err.h,ac_com_error_message=yes)
    fi

                SQUID_CHECK_MAX_SKEW_IN_KRB5_CONTEXT
    if test x"$squid_cv_max_skew_context" = x"yes"; then
       AC_DEFINE(HAVE_MAX_SKEW_IN_KRB5_CONTEXT, 1, [Define to 1 if max_skew in struct krb5_context])
    fi

    if test `echo $KRB5LIBS | grep -c com_err` -ne 0 -a "x$ac_com_error_message" == "xyes" ; then
        AC_CHECK_LIB(com_err,error_message,
            AC_DEFINE(HAVE_ERROR_MESSAGE,1,
                                                          [Define to 1 if you have error_message]),)
    elif test  "x$ac_com_error_message" == "xyes" ; then
        AC_CHECK_LIB(krb5,error_message,
            AC_DEFINE(HAVE_ERROR_MESSAGE,1,
                                                          [Define to 1 if you have error_message]),)
    fi
    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]),)

                SQUID_CHECK_KRB5_CONTEXT_MEMORY_CACHE
    if test "$squid_cv_memory_cache" = "yes" ; then
        AC_DEFINE(HAVE_KRB5_MEMORY_CACHE,1, [Define to 1 if you have MEMORY: cache support])
    fi

    SQUID_CHECK_WORKING_GSSAPI
    if test "$squid_cv_working_gssapi" = "yes" ; then
        AC_DEFINE(HAVE_GSSAPI, 1, [GSSAPI support])
    fi

    SQUID_CHECK_SPNEGO_SUPPORT
    if test "$squid_cv_have_spnego" = "yes" ; then
     AC_DEFINE(HAVE_SPNEGO,1, [Define to 1 if you have SPNEGO support])
    fi

    SQUID_CHECK_WORKING_KRB5
    if test "$squid_cv_working_krb5" = "yes" ; then
        AC_DEFINE(HAVE_KRB5, 1, [KRB5 support])
    fi

   AC_SUBST(KRB5INCS)
   AC_SUBST(KRB5LIBS)
fi
SQUID_STATE_ROLLBACK([krbsave])
AM_CONDITIONAL(HAVE_SPNEGO, test x"$squid_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. This has security implications, and is deprecated]),
[ 
SQUID_YESNO([$enableval],[--enable-ntlm-fail-open takes no argument])
])
SQUID_DEFINE_UNQUOTED(NTLM_FAIL_OPEN,${enable_ntlm_fail_open:=no},
  [Define if NTLM is allowed to fail gracefully when a helper has problems.])
AC_MSG_NOTICE([ntlm-fail-open enabled: $enable_ntlm_fail_open])

AC_ARG_ENABLE(external-acl-helpers,
  AS_HELP_STRING([--enable-external-acl-helpers="list of helpers"],
                       [Enable external_acl helpers support and thelpers themselves.
                  Default is to build all buildable helpers and enable support.
                                                                        To disable support, use --disable-external-acl-helpers.
                  To build no helpers, specify "none".
                                                                        To see available helpers, see the helpers/external_acl
                                                                        directory]), [
#nothing to do, really
])
if test "x${enable_external_acl_helpers:=yes}" = "xyes" ;then
        SQUID_LOOK_FOR_MODULES([$srcdir/helpers/external_acl],
                               [enable_external_acl_helpers])
fi
if test "x$enable_external_acl_helpers" = "xnone" ; then
        enable_external_acl_helpers=""
fi
EXTERNAL_ACL_HELPERS=""
enable_external_acl_helpers="`echo $enable_external_acl_helpers| sed -e 's/,/ /g;s/  */ /g'`"
if test "x$enable_external_acl_helpers" != "xno" ; then
  for helper in $enable_external_acl_helpers ; do
    dir="$srcdir/helpers/external_acl/$helper"
                if test -f $dir/config.test && sh $dir/config.test "$@"; then
                        EXTERNAL_ACL_HELPERS="$EXTERNAL_ACL_HELPERS $helper"
                else
                        AC_MSG_NOTICE([external acl helper $helper ... found but cannot be built])
                fi
        done
fi
AC_MSG_NOTICE([External acl helpers built: $EXTERNAL_ACL_HELPERS])
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"
            elif test -d $srcdir/helpers/url_rewrite/$helper ; then
                AC_MSG_NOTICE([URL re-write helper $helper ... found but cannot be built])
            fi
        done
fi
if test -n "$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.]), [ 
SQUID_YESNO([$enableval],
            [--disable-mempools option takes no arguments])
])
# notice: the definition's value meaning is INVERTED
SQUID_DEFINE_UNQUOTED(USE_MEMPOOLS,${enable_mempools:=yes},
   [Disable Memory Pools support and fall back to system malloc])
AC_MSG_NOTICE([MemPools enabled: $enable_mempools])

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]),
[ 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
])


# Check for Cyrus SASL
if test "$squid_require_sasl" = "yes"; then
        AC_CHECK_HEADERS(sasl/sasl.h sasl.h)
        if test "$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

# Disable "unlinkd" code
AC_ARG_ENABLE(unlinkd,
  AS_HELP_STRING([--disable-unlinkd],[Do not use unlinkd]), [
SQUID_YESNO([$enableval],
            [unrecognized argument to --disable-unlinkd: $enableval])
])
SQUID_DEFINE_UNQUOTED([USE_UNLINKD],${enable_unlinkd:=yes},
                      [Enable useage of unlinkd])
AM_CONDITIONAL(ENABLE_UNLINKD,test "$enable_unlinkd" = "yes")
AC_MSG_NOTICE([unlinkd enabled: $enable_unlinkd])

# Enable backtraces on fatal errors
AC_ARG_ENABLE(stacktraces,
  AS_HELP_STRING([--enable-stacktraces],
                 [Enable automatic call backtrace on fatal errors]), [
SQUID_YESNO([$enableval],
            [unrecognized argument to --enable-stacktraces: $enableval])
])
SQUID_DEFINE_UNQUOTED([PRINT_STACK_TRACE],${enable_stacktraces:=no},
                      [Print stack traces on fatal errors])
AC_MSG_NOTICE([Automatically print stack trace on fatal errors: $enable_stacktraces])


# CPU Profiling options handling
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 should not enable this, 
                 as it slows squid down somewhat.
                 See lib/Profiler.c for more details.]), [
SQUID_YESNO([$enableval],
            [unrecognized argument to --enable-cpu-profiling: $enableval])
])
SQUID_DEFINE_UNQUOTED([USE_XPROF_STATS],${enable_cpu_profiling:=no},
                      [Define to enable CPU profiling within Squid])
AM_CONDITIONAL(ENABLE_XPROF_STATS,
               test $enable_cpu_profiling = "yes")
AC_MSG_NOTICE([CPU profiling enabled: $enable_cpu_profiling])

# 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.]), [
SQUID_YESNO([$enableval],
            [unrecognized argument to --enable-x-accelerator-vary: $enableval])
])
SQUID_DEFINE_UNQUOTED([X_ACCELERATOR_VARY],${enable_x_accelerator_vary:=no},
                      [Enable support for the X-Accelerator-Vary HTTP header])
AC_MSG_NOTICE([X-Accelerator-Vary support enabled: $enable_x_accelerator_vary])


AC_ARG_ENABLE(zph-qos,
  AS_HELP_STRING([--enable-zph-qos],[Enable ZPH QOS support]), [
SQUID_YESNO([$enableval],
            [unrecognized argument to --enable-zph-qos: $enableval])
])
SQUID_DEFINE_UNQUOTED([USE_ZPH_QOS],${enable_zph_qos:=no},
          [Enable Zero Penalty Hit QOS. When set, Squid will alter the
           TOS field of HIT responses to help policing network traffic])
AC_MSG_NOTICE([ZPH QOS enabled: $enable_zph_qos])

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
])

if $CPPUNITCONFIG --help >/dev/null; then
  squid_cv_cppunit_version="`$CPPUNITCONFIG --version`"
  AC_MSG_NOTICE([using system installed cppunit version $squid_cv_cppunit_version])
  unset squid_cv_cppunit_version
  SQUID_CPPUNIT_LIBS="`$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 automake handles this AC_PATH_PROG(MAKEDEPEND, makedepend, $TRUE)

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

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 \
        map \
        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 \
        openssl/x509v3.h \
        netinet/tcp.h \
        openssl/engine.h \
        ostream \
        paths.h \
        poll.h \
        pwd.h \
        shadow.h \
        regex.h \
        sched.h \
        security/pam_appl.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
,,,
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_SEARCH_LIBS([gethostbyname],[nsl resolv bind])
AC_SEARCH_LIBS([res_init],[resolv])
AC_SEARCH_LIBS([bind],[socket])
AC_SEARCH_LIBS([opcom_stack_trace],[opcom_stack])
AC_SEARCH_LIBS([strlcpy], [bsd])
AC_SEARCH_LIBS([yp_match], [nsl nss_nis nss_nisplus])
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(regex, main, [REGEXLIB="-lregex"])
case "$host_os" in
mingw|mingw32)
        AC_MSG_NOTICE([Use MSVCRT for math functions.])
        ;;
        *)
        dnl rint() is only used in old C code for now.
        AC_LANG_PUSH([C])
        AC_SEARCH_LIBS([rint],[m])
        AC_LANG_POP([C])
        ;;
esac

dnl Enable IPv6 support
AC_MSG_CHECKING([whether to enable IPv6])
use_ipng=auto
AC_ARG_ENABLE(ipv6,
  AS_HELP_STRING([--disable-ipv6],[Disable IPv6 support]),
[ case $enableval in
  yes|no)
    use_ipng=$enableval
    ;;
  *)
    ;;
  esac
])
AC_MSG_RESULT($use_ipng)

if test "$use_ipng" != "no"; then
  SAVED_LIBS="$LIBS"
  dnl Solaris 10/11 requires  -lsocket
  case "$host" in
    *-solaris*)
      LIBS="$LIBS -lsocket"
      ;;
    *)
      ;;
  esac
  AC_CACHE_CHECK([if PF_INET6 is available], squid_cv_pf_inet6,
    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;
        }
      ]])],[squid_cv_pf_inet6="yes" ; SAVED_LIBS="$LIBS"],[squid_cv_pf_inet6="no"],[])
   )
   LIBS="$SAVED_LIBS"
fi

# NP: semi-silent failure as IPv4-only mode is perfectly usable on this system.
# unless --enable-ipv6 is explicitly used. in which case it's a hard fail.
if test "x$use_ipng" = "xyes" && test "x$squid_cv_pf_inet6" = "xno"; then
        AC_MSG_ERROR([IPv6 cannot be built on this system. Basic kernel definitions are missing.])
elif test "x$use_ipng" = "xauto" && test "x$squid_cv_pf_inet6" = "xno"; then
        AC_MSG_WARN([IPv6 cannot be built on this system. Basic kernel definitions are missing.])
fi

if test "$use_ipng" != "no" && test "$squid_cv_pf_inet6" = "yes" ; then
  AC_DEFINE(USE_IPV6,1,[Enable support for IPv6 ])
  SET_IPV6_SETTINGS=""
  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
  # IPv6 is not available, but is not explicitly required. Auto-Disable.
  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])
  SET_IPV6_SETTINGS="\#IPv6 Not Available: "
fi
AC_SUBST(SET_IPV6_SETTINGS)

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 \
        eui64_aton \
        inet_ntop \
        inet_pton \
        initgroups \
        getaddrinfo \
        getnameinfo \
        strerror \
        strsep \
        strtoll \
        tempnam \
)

# Magic which checks whether we are forcing a type of comm loop we
# are actually going to (ab)use.
# Mostly ripped from squid-commloops, thanks to adrian and benno

if test -n "$squid_opt_io_loop_engine"; then
        AC_MSG_NOTICE([choosing user-specified net I/O API $squid_opt_io_loop_engine])
elif test "$enable_epoll" != "no" && test "$squid_cv_epoll_works" = "yes" ; then
  squid_opt_io_loop_engine="epoll"
elif test "$enable_kqueue" != "no" && test "$ac_cv_func_kqueue" = "yes" ; then
  squid_opt_io_loop_engine="kqueue"
elif test "$enable_poll" != "no" && test "$ac_cv_func_poll" = "yes" ; then
  squid_opt_io_loop_engine="poll"
elif test "$enable_select" != "no" && test "$ac_cv_func_select" = "yes" ; then
  squid_opt_io_loop_engine="select"
  if test "$squid_host_os" = "mingw" ; then
    squid_opt_io_loop_engine="select_win32"
  fi
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.])
  squid_opt_io_loop_engine="select"
fi

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

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

case $squid_opt_io_loop_engine 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

SQUID_CHECK_FUNC_STRNSTR
SQUID_CHECK_FUNC_VACOPY
SQUID_CHECK_FUNC___VACOPY

  
dnl IP-Filter support requires ipf header files. These aren't
dnl installed by default, so we need to check for them
if test "$enable_ipf_transparent" != "no" ; then
    AC_MSG_CHECKING(for availability of IP-Filter header files)
    # hold on to your hats...
    if test "$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 "$ac_cv_header_netinet_ip_fil_compat_h" = "yes" ; then
        have_ipfilter_compat_header="yes"
     fi
     if test "$have_ipfilter_compat_header" = "yes" &&
       test "$ac_cv_header_ip_fil_h" = "yes" &&
       test "$ac_cv_header_ip_nat_h" = "yes" ; then
        enable_ipf_transparent="yes"
    elif test "$have_ipfilter_compat_header" = "yes" &&
         test "$ac_cv_header_netinet_ip_fil_h" = "yes" &&
         test "$ac_cv_header_netinet_ip_nat_h" = "yes" ; then
        enable_ipf_transparent="yes"
    else
        enable_ipf_transparent="no"
    fi
    AC_MSG_RESULT($IPF_TRANSPARENT)
fi
AC_MSG_NOTICE([IPF-based transparent proxying enabled: $enable_ipf_transparent])
SQUID_DEFINE_UNQUOTED([IPF_TRANSPARENT],$enable_ipf_transparent,
    [Enable support for IPF-style transparent proxying])

if test "$enable_ipf_transparent" = "yes" -a "$squid_host_os" = "solaris" ; then
dnl On Solaris Ipfilter includes expect that SOLARIS2 is defined with the
dnl Solaris minor version (8, 9, 10, ...)
  solrev=`uname -r | sh -c 'IFS=. read j n x; echo $n'`
  CFLAGS="-DSOLARIS2=$solrev $CFLAGS" 
  CXXFLAGS="-DSOLARIS2=$solrev $CXXFLAGS" 
fi

dnl PF support requires a header file.
if test "$enable_pf_transparent" != "no" ; then
        if test "$ac_cv_header_net_pfvar_h" = "yes" -o \
    "$ac_cv_header_net_pf_pfvar_h" = "yes"; then
                if test "$enable_pf_transparent" = "auto" ; then
                        enable_pf_transparent="yes"
                fi
        else
                if test "$enable_pf_transparent" = "yes" ; then
      AC_MSG_ERROR([PF-based transparent proxy requested but needed header not found])
                fi
                enable_pf_transparent="no"
        fi
fi
SQUID_DEFINE_UNQUOTED([PF_TRANSPARENT],$enable_pf_transparent,
  [Enable support for PF-style transparent proxying])

if test "$enable_linux_netfilter" != "no" ; then
  if test "$ac_cv_header_linux_netfilter_ipv4_h" = "yes"; then
    if test "$enable_linux_netfilter" = "auto" ; then
      enable_linux_netfilter=yes
    fi
  else
    if test "$enable_linux_netfilter" = "auto" ; then
      enable_linux_netfilter=no
    else
      AC_MSG_ERROR([Linux Netfilter support requested but needed headers not found])
    fi
  fi
fi
#notice and define for LINUX_NETFILTER must be delayed as TPROXY
# may have something to say about it

dnl Netfilter TPROXY depends on libcap but the NAT parts can still work.
AC_MSG_NOTICE([Support for Netfilter-based interception proxy requested: $enable_linux_netfilter])
if test "$enable_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])
    # AC_DEFINE'd later
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([$SQUID_MAXFD may not be enough filedescriptors if your])
    AC_MSG_WARN([cache will be very busy.  Please see the FAQ page])
    AC_MSG_WARN([http://wiki.squid-cache.org/SquidFaq/TroubleShooting])
    AC_MSG_WARN([on how to increase your filedescriptor limit])
fi
LDFLAGS="$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.])
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 Hurd does not supply MAXPATHLEN. we may need to define it outselves.
dnl Other system define it in system headers
AC_CHECK_HEADERS([sys/param.h])
AC_MSG_CHECKING(for MAXPATHLEN)
AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <sys/param.h>]],[[int i = MAXPATHLEN;]])],[AC_MSG_RESULT(yes)],[AC_MSG_RESULT(no)
    AC_DEFINE(MAXPATHLEN,256,[If MAXPATHLEN has not been defined])])


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 \
        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/comm/Makefile \
        src/esi/Makefile \
        src/eui/Makefile \
        src/icmp/Makefile \
        src/ident/Makefile \
        src/ip/Makefile \
        src/log/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/DB/Makefile \
        helpers/basic_auth/getpwnam/Makefile \
        helpers/basic_auth/LDAP/Makefile \
        helpers/basic_auth/MSNT/Makefile \
        helpers/basic_auth/MSNT-multi-domain/Makefile \
        helpers/basic_auth/NCSA/Makefile \
        helpers/basic_auth/NIS/Makefile \
        helpers/basic_auth/PAM/Makefile \
        helpers/basic_auth/POP3/Makefile \
        helpers/basic_auth/RADIUS/Makefile \
        helpers/basic_auth/SASL/Makefile \
        helpers/basic_auth/SMB/Makefile \
        helpers/basic_auth/SSPI/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/kerberos/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/log_daemon/Makefile \
        helpers/log_daemon/file/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(libltdl)

AC_OUTPUT