configure.ac

#                                               -*- Autoconf -*-
# Process this file with autoconf to produce a configure script.

AC_PREREQ([2.59])

# For released versions, this is in x.y.z format.
# For GIT versions, this is x.y.z-git, where x.y.z denotes the software
# version that was used as a base + changes that were made later, but
# are not released yet.
AC_INIT(kea, 0.8.0-git, kea-dev@isc.org)
AC_CONFIG_SRCDIR(README)

# serial-tests is not available in automake version before 1.13, so
# we'll check that and conditionally use serial-tests. This check is
# adopted from code by Richard W.M. Jones:
# https://www.redhat.com/archives/libguestfs/2013-February/msg00102.html
m4_define([serial_tests], [
    m4_esyscmd([automake --version |
                head -1 |
                awk '{split ($NF,a,"."); if (a[1] == 1 && a[2] >= 12) { print "serial-tests" }}'
    ])
])
AM_INIT_AUTOMAKE(foreign serial_tests)

m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])dnl be backward compatible
AC_CONFIG_HEADERS([config.h])
AC_CONFIG_MACRO_DIR([m4macros])

# Checks for programs.
AC_PROG_CXX

# Check for exact Kea version.
AC_MSG_CHECKING(whether this is a tarball or git source)
if test -d "${srcdir}/.git"; then
	KEA_SRCID="git `(cd "${top_srcdir}";git rev-parse HEAD)`"
        AC_MSG_RESULT("git")
else
        KEA_SRCID="tarball"
        AC_MSG_RESULT("tarball")
fi
# Export EXTENDED_VERSION to config.h
# This will be either "tarball" or "git abcd".
AC_DEFINE_UNQUOTED([EXTENDED_VERSION], ["${KEA_SRCID}"], [Extended Kea version])

# Enable low-performing debugging facilities? This option optionally
# enables some debugging aids that perform slowly and hence aren't built
# by default.
AC_ARG_ENABLE([debug],
  AS_HELP_STRING([--enable-debug],
    [enable debugging (default is no)]),
  [case "${enableval}" in
    yes) debug_enabled=yes ;;
    no)  debug_enabled=no ;;
    *)   AC_MSG_ERROR([bad value ${enableval} for --enable-debug]) ;;
  esac],[debug_enabled=no])
AM_CONDITIONAL([DEBUG_ENABLED], [test x$debug_enabled = xyes])
AM_COND_IF([DEBUG_ENABLED], [AC_DEFINE([ENABLE_DEBUG], [1], [Enable low-performing debugging facilities?])])

# Libtool configuration
#

# libtool cannot handle spaces in paths, so exit early if there is one
if [ test `echo $PWD | grep -c ' '` != "0"  ]; then
    AC_MSG_ERROR([Kea cannot be built in a directory that contains spaces, because of libtool limitations. Please change the directory name, or use a symbolic link that does not contain spaces.])
fi

# On FreeBSD (and probably some others), clang++ does not meet an autoconf
# assumption in identifying libtool configuration regarding shared library:
# the configure script will execute "$CC -shared $CFLAGS/$CXXFLAGS -v" and
# expect the output contains -Lxxx or -Ryyy.  This is the case for g++, but
# not for clang++, and, as a result, it will cause various errors in linking
# programs or running them with a shared object (such as some of our python
# scripts).
# To work around this problem we define a temporary variable
# "CXX_LIBTOOL_LDFLAGS".  It's expected to be defined as, e.g, "-L/usr/lib"
# to temporarily fake the output so that it will be compatible with that of
# g++.
CFLAGS_SAVED=$CFLAGS
CXXFLAGS_SAVED=$CXXFLAGS
CFLAGS="$CFLAGS $CXX_LIBTOOL_LDFLAGS"
CXXFLAGS="$CXXFLAGS $CXX_LIBTOOL_LDFLAGS"
AC_PROG_LIBTOOL
CFLAGS=$CFLAGS_SAVED
CXXFLAGS=$CXXFLAGS_SAVED

# Use C++ language
AC_LANG([C++])

# Identify the compiler: this check must be after AC_PROG_CXX and AC_LANG.
AM_CONDITIONAL(USE_GXX, test "X${GXX}" = "Xyes")
AC_CHECK_DECL([__SUNPRO_CC], [SUNCXX="yes"], [SUNCXX="no"])
AC_CHECK_DECL([__clang__], [CLANGPP="yes"], [CLANGPP="no"])
AM_CONDITIONAL(USE_CLANGPP, test "X${CLANGPP}" = "Xyes")

dnl Determine if we are using GNU sed
GNU_SED=no
$SED --version 2> /dev/null | grep GNU > /dev/null 2>&1
if test $? -eq 0; then
  GNU_SED=yes
fi

# Linker options

# check -R, "-Wl,-R" or -rpath
AX_ISC_RPATH

# Compiler dependent settings: define some mandatory CXXFLAGS here.
# We also use a separate variable KEA_CXXFLAGS.  This will (and should) be
# used as the default value for each specific AM_CXXFLAGS:
# AM_CXXFLAGS = $(KEA_CXXFLAGS)
# AM_CXXFLAGS += ... # add module specific flags
# We need this so that we can disable some specific compiler warnings per
# module basis; since AM_CXXFLAGS are placed before CXXFLAGS, and since
# gcc's -Wno-XXX option must be specified after -Wall or -Wextra, we cannot
# specify the default warning flags in CXXFLAGS and let specific modules
# "override" the default.

# This may be used to try linker flags.
AC_DEFUN([KEA_CXX_TRY_FLAG], [
  AC_MSG_CHECKING([whether $CXX supports $1])

  kea_save_CXXFLAGS="$CXXFLAGS"
  CXXFLAGS="$CXXFLAGS $1"

  AC_LINK_IFELSE([AC_LANG_SOURCE([int main(void){ return 0;}])],
                 [kea_cxx_flag=yes], [kea_cxx_flag=no])
  CXXFLAGS="$kea_save_CXXFLAGS"

  if test "x$kea_cxx_flag" = "xyes"; then
    ifelse([$2], , :, [$2])
  else
    ifelse([$3], , :, [$3])
  fi

  AC_MSG_RESULT([$kea_cxx_flag])
])

CXX_VERSION="unknown"

# SunStudio compiler requires special compiler options for boost
# (http://blogs.sun.com/sga/entry/boost_mini_howto)
if test "$SUNCXX" = "yes"; then
CXX_VERSION=`$CXX -V 2> /dev/null | head -1`
CXXFLAGS="$CXXFLAGS -library=stlport4 -features=tmplife -features=tmplrefstatic"
MULTITHREADING_FLAG="-mt"
fi

# Newer versions of clang++ promotes "unused driver arguments" warnings to
# a fatal error with -Werror, causing build failure.  Since we use multiple
# compilers on multiple systems, this can easily happen due to settings for
# non clang++ environments that could be just ignored otherwise.  It can also
# happen if clang++ is used via ccache.  So, although probably suboptimal,
# we suppress this particular warning.  Note that it doesn't weaken checks
# on the source code.
if test "$CLANGPP" = "yes"; then
CXX_VERSION=`$CXX --version 2> /dev/null | head -1`
KEA_CXXFLAGS="$KEA_CXXFLAGS -Qunused-arguments"
fi

KEA_CXX_TRY_FLAG([-Wno-missing-field-initializers],
	[WARNING_NO_MISSING_FIELD_INITIALIZERS_CFLAG="-Wno-missing-field-initializers"])
AC_SUBST(WARNING_NO_MISSING_FIELD_INITIALIZERS_CFLAG)

# gcc specific settings:
if test "X$GXX" = "Xyes"; then
CXX_VERSION=`$CXX --version 2> /dev/null | head -1`
KEA_CXXFLAGS="$KEA_CXXFLAGS -Wall -Wextra -Wnon-virtual-dtor -Wwrite-strings -Woverloaded-virtual -Wno-sign-compare"
case "$host" in
*-solaris*)
	MULTITHREADING_FLAG=-pthreads
	# In Solaris, IN6ADDR_ANY_INIT and IN6ADDR_LOOPBACK_INIT need -Wno-missing-braces
	KEA_CXXFLAGS="$KEA_CXXFLAGS -Wno-missing-braces"
	;;
*)
	MULTITHREADING_FLAG=-pthread
	;;
esac

# Don't use -Werror if configured not to
AC_ARG_WITH(werror,
    AC_HELP_STRING([--with-werror], [Compile using -Werror (default=yes)]),
    [
     case "${withval}" in
         yes) with_werror=1 ;;
         no)  with_werror=0 ;;
         *)   AC_MSG_ERROR(bad value ${withval} for --with-werror) ;;
     esac],
     [with_werror=1])

werror_ok=0

# Certain versions of gcc (g++) have a bug that incorrectly warns about
# the use of anonymous name spaces even if they're closed in a single
# translation unit.  For these versions we have to disable -Werror.
if test $with_werror = 1; then
   CXXFLAGS_SAVED="$CXXFLAGS"
   CXXFLAGS="$CXXFLAGS $KEA_CXXFLAGS -Werror"
   AC_MSG_CHECKING(for in-TU anonymous namespace breakage)
   # We use struct, not class, here, because some compilers complain about
   # "unused private members", causing a false positive.
   AC_TRY_COMPILE([namespace { struct Foo {}; }
   namespace isc {struct Bar {Foo foo_;};} ],,
	[AC_MSG_RESULT(no)
	 werror_ok=1
	 KEA_CXXFLAGS="$KEA_CXXFLAGS -Werror"],
	[AC_MSG_RESULT(yes)])
   CXXFLAGS="$CXXFLAGS_SAVED"
fi

fi				dnl GXX = yes

# allow building programs with static link.  we need to make it selective
# because loadable modules cannot be statically linked.
AC_ARG_ENABLE([static-link],
AC_HELP_STRING([--enable-static-link],
  [build programs with static link [[default=no]]]),
  [enable_static_link=yes], [enable_static_link=no])
AM_CONDITIONAL(USE_STATIC_LINK, test $enable_static_link = yes)
AM_COND_IF([USE_STATIC_LINK], [AC_DEFINE([USE_STATIC_LINK], [1], [Was Kea statically linked?])])

# Check validity about some libtool options
if test $enable_static_link = yes -a $enable_static = no; then
	AC_MSG_ERROR([--enable-static-link requires --enable-static])
fi
if test $enable_shared = no; then
	AC_MSG_ERROR([Kea requires shared libraries to be built])
fi

# OS dependent configuration
SET_ENV_LIBRARY_PATH=no
ENV_LIBRARY_PATH=LD_LIBRARY_PATH
kea_undefined_pthread_behavior=no

case "$host" in
*-solaris*)
	# Solaris requires special definitions to get some standard libraries
	# (e.g. getopt(3)) available with common used header files.
	CPPFLAGS="$CPPFLAGS -D_XPG4_2 -D__EXTENSIONS__"
	# "now" binding is necessary to prevent deadlocks in C++ static initialization code
	LDFLAGS="$LDFLAGS -z now"
	# Destroying locked mutexes, condition variables being waited
	# on, etc. are undefined behavior on Solaris, so we set it as
	# such here.
	kea_undefined_pthread_behavior=yes
	;;
*-apple-darwin*)
	# Starting with OSX 10.7 (Lion) we must choose which IPv6 API to use
	# (RFC2292 or RFC3542).
	CPPFLAGS="$CPPFLAGS -D__APPLE_USE_RFC_3542"

	# In OS X 10.9 (and possibly any future versions?) pthread_cond_destroy
	# doesn't work as documented, which makes some of unit tests fail.
        AC_TRY_RUN([
	#include <Availability.h>
	int main(void)
	{
	#ifdef __MAC_OS_X_VERSION_MIN_REQUIRED
	#if __MAC_OS_X_VERSION_MIN_REQUIRED < 1090
	return 1;
	#else
	return 0;
	#endif
	#endif
	return 1;
	}],[kea_undefined_pthread_behavior=yes],[],[])

	# libtool doesn't work perfectly with Darwin: libtool embeds the
	# final install path in dynamic libraries and our loadable python
	# modules always refer to that path even if it's loaded within the
	# source tree.  This prevents pre-install tests from working.
	# To work around this problem we explicitly specify paths to dynamic
	# libraries when we use them in the source tree.
	SET_ENV_LIBRARY_PATH=yes
	ENV_LIBRARY_PATH=DYLD_LIBRARY_PATH
	;;
*-freebsd*)
	SET_ENV_LIBRARY_PATH=yes
	;;
*-netbsd*)
	SET_ENV_LIBRARY_PATH=yes
	;;
*-openbsd*)
	SET_ENV_LIBRARY_PATH=yes
	;;
esac
AM_CONDITIONAL(SET_ENV_LIBRARY_PATH, test $SET_ENV_LIBRARY_PATH = yes)
AC_SUBST(SET_ENV_LIBRARY_PATH)
AC_SUBST(ENV_LIBRARY_PATH)
if [ test $kea_undefined_pthread_behavior = "yes" ]; then
   AC_DEFINE([HAS_UNDEFINED_PTHREAD_BEHAVIOR], [1], [Does this platform have some undefined pthreads behavior?])
fi

# Our experiments have shown Solaris 10 has broken support for the
# IPV6_USE_MIN_MTU socket option for getsockopt(); it doesn't return the value
# previously set via setsockopt().  We know it doesn't happen on one instance
# on Solaris 11, but we don't know whether it happens for any Solaris 10
# implementations or for earlier versions of Solaris.  In any case, at the
# moment this matters for only one unittest case, so we'll simply disable
# the affected test using the following definition with the specific hardcoding
# of that version of Solaris.
case "$host" in
*-solaris2.10)
	AC_DEFINE([HAVE_BROKEN_GET_IPV6_USE_MIN_MTU], [1],
	[Define to 1 if getsockopt(IPV6_USE_MIN_MTU) does not work])
	;;
esac

m4_define([_AM_PYTHON_INTERPRETER_LIST], [python python3.4 python3.3 python3.2 python3.1 python3])
AC_ARG_WITH([pythonpath],
AC_HELP_STRING([--with-pythonpath=PATH],
  [specify an absolute path to python executable when automatic version check (incorrectly) fails]),
  [python_path="$withval"], [python_path="auto"])
if test "$python_path" = auto; then
	AM_PATH_PYTHON([3.1],,[PYTHON=no])
else
	# Older versions of automake can't handle python3 well.  This is an
	# in-house workaround for them.
	PYTHON=$python_path
	AC_SUBST(PYTHON)
	PYTHON_PREFIX='${prefix}'
	AC_SUBST(PYTHON_PREFIX)
	PYTHON_EXEC_PREFIX='$(exec_prefix)'
	AC_SUBST(PYTHON_EXEC_PREFIX)
	PYTHON_VERSION=[`$PYTHON -c "import sys; sys.stdout.write(sys.version[:3])"`]
	if test `echo "$PYTHON_VERSION >= 3.1" | bc` != 1 ; then
		AC_MSG_ERROR(["Python version too old: $PYTHON_VERSION, need 3.1 or higher"])
	fi
	AC_SUBST(PYTHON_VERSION)
	PYTHON_PLATFORM=`$PYTHON -c "import sys; print(sys.platform)"`
	AC_SUBST(PYTHON_PLATFORM)
	pythondir='${prefix}/lib/python'$PYTHON_VERSION'/site-packages'
	AC_SUBST(pythondir)
	pkgpythondir='${pythondir}/'$PACKAGE
	AC_SUBST(pkgpythondir)
	pyexecdir='${exec_prefix}/lib/python'$PYTHON_VERSION'/site-packages'
	AC_SUBST(pyexecdir)
	pkgpyexecdir='${pyexecdir}/'$PACKAGE
	AC_SUBST(pkgpyexecdir)
fi

# produce PIC unless we disable shared libraries. need this for python bindings.
if test $enable_shared != "no" -a "X$GXX" = "Xyes"; then
   KEA_CXXFLAGS="$KEA_CXXFLAGS -fPIC"
fi

AC_SUBST(KEA_CXXFLAGS)

# Checks for libraries.

AC_SEARCH_LIBS(inet_pton, [nsl])
AC_SEARCH_LIBS(recvfrom, [socket])
AC_SEARCH_LIBS(nanosleep, [rt])
AC_SEARCH_LIBS(dlsym, [dl])

# Checks for header files.

# Checks for typedefs, structures, and compiler characteristics.
AC_HEADER_STDBOOL
AC_TYPE_SIZE_T


# Detect OS type (it may be used to do OS-specific things, e.g.
# interface detection in DHCP)
AC_MSG_CHECKING(OS family)
system=`uname -s`
case $system in
    Linux)
      OS_TYPE="Linux"
      CPPFLAGS="$CPPFLAGS -DOS_LINUX"
      ;;
    Darwin | FreeBSD | NetBSD | OpenBSD)
      OS_TYPE="BSD"
      CPPFLAGS="$CPPFLAGS -DOS_BSD"
      ;;
    SunOS)
      OS_TYPE="Solaris"
      CPPFLAGS="$CPPFLAGS -DOS_SUN"
      ;;
    *)
      OS_TYPE="Unknown"
      AC_MSG_WARN("Unsupported OS: uname returned $system")
      ;;
esac
AC_MSG_RESULT($OS_TYPE)

AM_CONDITIONAL(OS_LINUX, test $OS_TYPE = Linux)
AM_COND_IF([OS_LINUX], [AC_DEFINE([OS_LINUX], [1], [Running on Linux?])])
AM_CONDITIONAL(OS_BSD, test $OS_TYPE = BSD)
AM_COND_IF([OS_BSD], [AC_DEFINE([OS_BSD], [1], [Running on BSD?])])
AM_CONDITIONAL(OS_SOLARIS, test $OS_TYPE = Solaris)
AM_COND_IF([OS_SOLARIS], [AC_DEFINE([OS_SOLARIS], [1], [Running on Solaris?])])

# Deal with variants
AM_CONDITIONAL(OS_FREEBSD, test $system = FreeBSD)
AM_COND_IF([OS_FREEBSD], [AC_DEFINE([OS_FREEBSD], [1], [Running on FreeBSD?])])
AM_CONDITIONAL(OS_NETBSD, test $system = NetBSD)
AM_COND_IF([OS_NETBSD], [AC_DEFINE([OS_NETBSD], [1], [Running on NetBSD?])])
AM_CONDITIONAL(OS_OPENBSD, test $system = OpenBSD)
AM_COND_IF([OS_OPENBSD], [AC_DEFINE([OS_OPENBSD], [1], [Running on OpenBSD?])])
AM_CONDITIONAL(OS_OSX, test $system = Darwin)
AM_COND_IF([OS_OSX], [AC_DEFINE([OS_OSX], [1], [Running on OSX?])])


AC_MSG_CHECKING(for sa_len in struct sockaddr)
AC_TRY_COMPILE([
#include <sys/types.h>
#include <sys/socket.h>],
[struct sockaddr sa; sa.sa_len = 0; return (0);],
        [AC_MSG_RESULT(yes)
        AC_DEFINE(HAVE_SA_LEN, 1, [Define to 1 if sockaddr has a sa_len member, and corresponding sin_len and sun_len])],
        AC_MSG_RESULT(no))

enable_gtest="no"
GTEST_INCLUDES=

AC_ARG_WITH([gtest-source],
            [AS_HELP_STRING([--with-gtest-source=PATH],
                            [location of the Googletest source, defaults to /usr/src/gtest])],
            [enable_gtest="yes" ; GTEST_SOURCE="$withval"],
            [GTEST_SOURCE="/usr/src/gtest"])

AC_ARG_WITH([gtest],
	    [AS_HELP_STRING([--with-gtest=PATH],
			    [specify a path to gtest header files (PATH/include) and library (PATH/lib)])],
	[gtest_path="$withval"; enable_gtest="yes"], [gtest_path="no"])

AC_ARG_WITH(lcov,
[  --with-lcov[=PROGRAM]         enable gtest and coverage target using the specified lcov], lcov="$withval", lcov="no")

USE_LCOV="no"
if test "$lcov" != "no"; then
	# force gtest if not set
	if test "$enable_gtest" = "no"; then
#		AC_MSG_ERROR("lcov needs gtest for test coverage report")
		AC_MSG_NOTICE([gtest support is now enabled, because used by coverage tests])
		enable_gtest="yes"
	fi
	if test "$lcov" != "yes"; then
		LCOV=$lcov
	else
		AC_PATH_PROG([LCOV], [lcov])
	fi
	if test -x "${LCOV}"; then
		USE_LCOV="yes"
	else
		AC_MSG_ERROR([Cannot find lcov.])
	fi
	# is genhtml always in the same directory?
	GENHTML=`echo "$LCOV" | ${SED} s/lcov$/genhtml/`
	if test ! -x $GENHTML; then
		AC_MSG_ERROR([genhtml not found, needed for lcov])
	fi
	# GCC specific?
	CXXFLAGS="$CXXFLAGS -fprofile-arcs -ftest-coverage"
	LIBS=" $LIBS -lgcov"
	AC_SUBST(CPPFLAGS)
	AC_SUBST(LIBS)
	AC_SUBST(LCOV)
	AC_SUBST(GENHTML)
fi
AC_SUBST(USE_LCOV)

# Simplified, non-caching AC_CHECK_PROG
# Searches $PATH for the existence of argument 2,
# and sets the full path to the variable in argument 1.
# if not found, and a third argument is given, the value
# is set to that. If not, the value is untouched.
# Does not take absolute paths into account at this point,
# and also works for single files only (arguments are not
# stripped like in AC_CHECK_PROG)
AC_DEFUN([ACX_CHECK_PROG_NONCACHE], [
    RESULT=""
    IFS_SAVED="$IFS"
    IFS=${PATH_SEPARATOR}
    for cur_path in ${PATH} ; do
      if test -e "${cur_path}/$2" ; then
          RESULT="${cur_path}/$2"
      fi
    done
    if test "$RESULT" = "" ; then
        :
        m4_ifvaln([$3], [$1=$3])
    else
        $1=$RESULT
    fi
    IFS="$IFS_SAVED"
])

# Avoid checking Botan if OpenSSL is wanted
AC_ARG_WITH([openssl],
            [AS_HELP_STRING([--with-openssl[[=PATH]]], [Enables OpenSSL,
            location can be specified optionally])],
            [use_openssl="$withval"],
            [use_openssl="auto"])

# Botan helper test function
# Tries to compile a botan program, given the output of the given
# config tool
# Arguments:
# - name of tool (checked for path), must support --libs and --cflags
# - fixed argument(s) for tool
# - action if successful
AC_DEFUN([ACX_TRY_BOTAN_TOOL], [
    TOOL=$1
    TOOL_ARG=$2
    BOTAN_TOOL=""
    ACX_CHECK_PROG_NONCACHE([BOTAN_TOOL], [${TOOL}])
    AC_MSG_CHECKING([usability of ${TOOL} ${TOOL_ARG}])
    if test "$BOTAN_TOOL" != "" ; then
        if test -x ${BOTAN_TOOL}; then
            CRYPTO_LIBS=`$BOTAN_TOOL $TOOL_ARG --libs`
            LIBS_SAVED=${LIBS}
            LIBS="$LIBS $CRYPTO_LIBS"
            CRYPTO_INCLUDES=`$BOTAN_TOOL $TOOL_ARG --cflags`
            CPPFLAGS_SAVED=${CPPFLAGS}
            CPPFLAGS="$CRYPTO_INCLUDES $CPPFLAGS"
            #AC_MSG_RESULT([found])
            AC_LINK_IFELSE(
                [AC_LANG_PROGRAM([#include <botan/botan.h>
                                  #include <botan/hash.h>
                                 ],
                                 [using namespace Botan;
                                  LibraryInitializer::initialize();
                                  HashFunction *h = get_hash("MD5");
                                 ])],
                [ AC_MSG_RESULT([ok])
                  $3
                ],
                [ AC_MSG_RESULT([not usable]) ]
            )
            LIBS=${LIBS_SAVED}
            CPPFLAGS=${CPPFLAGS_SAVED}
        else
            AC_MSG_RESULT([not executable])
        fi
    else
        AC_MSG_RESULT([not found])
    fi
    BOTAN_TOOL=""
    AC_SUBST(BOTAN_TOOL)
    ]
)

# Check for Botan
#
# Unless --with-botan-config is given, we first try to find these config
# scripts ourselves. Unfortunately, on some systems, these scripts do not
# provide the correct implementation, so for each script found, we try
# a compilation test (ACX_TRY_BOTAN_TOOL). If none are found, or none of
# them work, we see if pkg-config is available. If so, we try the several
# potential pkg-config .pc files. Again, on some systems, these can return
# incorrect information as well, so the try-compile test is repeated for
# each.
#
# If a working config script or pkgconfig file is found, we then munge its
# output for use in our Makefiles, and to make sure it works, another header
# and compilation test is done (this should also check whether we can compile
# against botan should neither -config scripts nor pkgconfig data exist).
#
botan_config="yes"
if test "${use_openssl}" != "auto" -a "${use_openssl}" != "no" ; then
   botan_config="no"
fi
AC_ARG_WITH([botan-config],
  AC_HELP_STRING([--with-botan-config=PATH],
    [specify the path to the botan-config script]),
    [botan_config="$withval"])
if test "${botan_config}" = "no" ; then
    if test "${use_openssl}" = "no" ; then
       AC_MSG_ERROR([Need Botan or OpenSSL for libcryptolink])
    fi
elif test "${botan_config}" != "yes" ; then
    if test -x "${botan_config}" ; then
        if test -d "${botan_config}" ; then
            AC_MSG_ERROR([${botan_config} is a directory])
        else
            BOTAN_CONFIG="${botan_config}"
        fi
    else
        AC_MSG_ERROR([--with-botan-config should point to a botan-config program and not a directory (${botan_config})])
    fi
else
    BOTAN_CONFIG=""
    # first try several possible names of the config script
    # (botan-config-1.8 is there just in case, the official name change
    # came later)
    BOTAN_CONFIG_VERSIONS="botan-config-1.10 botan-config-1.9 botan-config-1.8 botan-config"
    for botan_config in $BOTAN_CONFIG_VERSIONS; do
        ACX_TRY_BOTAN_TOOL([$botan_config],,
                           [ BOTAN_CONFIG="$botan_config"  ]
                          )
        if test "$BOTAN_CONFIG" != "" ; then
            break
        fi
    done
    if test "$BOTAN_CONFIG" = "" ; then
        AC_PATH_PROG([PKG_CONFIG], [pkg-config])
        if test "$PKG_CONFIG" != "" ; then
            # Ok so no script found, see if pkg-config knows of it.
            # Unfortunately, the botan.pc files also have their minor version
            # in their name, so we need to try them one by one
            BOTAN_VERSIONS="botan-1.10 botan-1.9 botan-1.8"
            for version in $BOTAN_VERSIONS; do
                ACX_TRY_BOTAN_TOOL([pkg-config], ["$version --silence-errors"],
                                   [ BOTAN_CONFIG="$PKG_CONFIG $version" ]
                                  )
            if test "$BOTAN_CONFIG" != "" ; then
                break
            fi
            done
        fi
    fi
fi

if test "x${BOTAN_CONFIG}" != "x"
then
    CRYPTO_LIBS=`${BOTAN_CONFIG} --libs`
    CRYPTO_INCLUDES=`${BOTAN_CONFIG} --cflags`

    # We expect botan-config --libs to contain -L<path_to_libbotan>, but
    # this is not always the case.  As a heuristics workaround we add
    # -L`botan-config --prefix/lib` in this case (if not present already).
    # Same for CRYPTO_INCLUDES (but using include instead of lib) below.
    if [ ${BOTAN_CONFIG} --prefix >/dev/null 2>&1 ] ; then
        echo ${CRYPTO_LIBS} | grep -- -L > /dev/null || \
            CRYPTO_LIBS="-L`${BOTAN_CONFIG} --prefix`/lib ${CRYPTO_LIBS}"
        echo ${CRYPTO_INCLUDES} | grep -- -I > /dev/null || \
            CRYPTO_INCLUDES="-I`${BOTAN_CONFIG} --prefix`/include ${CRYPTO_INCLUDES}"
    fi
fi

if test "x${CRYPTO_LIBS}" != "x"
then
   dnl Determine the Botan version
   AC_MSG_CHECKING([Botan version])
   cat > conftest.cpp << EOF
#include <botan/version.h>
AUTOCONF_BOTAN_VERSION=BOTAN_VERSION_MAJOR . BOTAN_VERSION_MINOR . BOTAN_VERSION_PATCH
EOF

   CRYPTO_VERSION=`$CPP $CPPFLAGS $CRYPTO_INCLUDES conftest.cpp | grep '^AUTOCONF_BOTAN_VERSION=' | $SED -e 's/^AUTOCONF_BOTAN_VERSION=//' -e 's/[[ 	]]//g' -e 's/"//g' 2> /dev/null`
   if test -z "$CRYPTO_VERSION"; then
      CRYPTO_VERSION="unknown"
   fi
   $RM -f conftest.cpp
   AC_MSG_RESULT([$CRYPTO_VERSION])

   # botan-config script (and the way we call pkg-config) returns -L and -l
   # as one string, but we need them in separate values
   CRYPTO_LDFLAGS=
   for flag in ${CRYPTO_LIBS}; do
       CRYPTO_LDFLAGS="${CRYPTO_LDFLAGS} `echo $flag | ${SED} -ne '/^\(\-L\)/p'`"
       CRYPTO_LIBS="${CRYPTO_LIBS} `echo $flag | ${SED} -ne '/^\(\-l\)/p'`"
   done

   # See crypto_rpath for some info on why we do this
   if test "x$ISC_RPATH_FLAG" != "x"; then
       CRYPTO_RPATH=
       for flag in ${CRYPTO_LIBS}; do
               CRYPTO_RPATH="${CRYPTO_RPATH} `echo $flag | ${SED} -ne "s/^\(\-L\)/${ISC_RPATH_FLAG}/p"`"
       done
   # According to the libtool manual, it should be sufficient if we
   # specify the "-R libdir" in our wrapper library of botan (no other
   # programs will need libbotan directly); "libdir" should be added to
   # the program's binary image.  But we've seen in our build environments
   # that (some versions of?) libtool doesn't propagate -R as documented,
   # and it caused a linker error at run time.  To work around this, we
   # also add the rpath to the global LDFLAGS.
       LDFLAGS="$CRYPTO_RPATH $LDFLAGS"
   fi

   # Even though chances are high we already performed a real compilation check
   # in the search for the right (pkg)config data, we try again here, to
   # be sure.
   CPPFLAGS_SAVED=$CPPFLAGS
   CPPFLAGS="$CRYPTO_INCLUDES $CPPFLAGS"
   LIBS_SAVED="$LIBS"
   LIBS="$LIBS $CRYPTO_LIBS"

   # ac_header_preproc is an autoconf symbol (undocumented but stable) that
   # is set if the pre-processor phase passes. Thus by adding a custom
   # failure handler we can detect the difference between a header not existing
   # (or not even passing the pre-processor phase) and a header file resulting
   # in compilation failures.
   AC_CHECK_HEADERS([botan/botan.h],,[
        CRYPTO_INCLUDES=""
        CRYPTO_LIBS=""
        CRYPTO_LDFLAGS=""
        CRYPTO_RPATH=""
	if test "x$ac_header_preproc" = "xyes"; then
		AC_MSG_RESULT([
botan/botan.h was found but is unusable. The most common cause of this problem
is attempting to use an updated C++ compiler with older C++ libraries, such as
the version of Botan that comes with your distribution. If you have updated
your C++ compiler we highly recommend that you use support libraries such as
Boost and Botan that were compiled with the same compiler version.])
	else
		AC_MSG_RESULT([Missing required header files.])
	fi]
   )
   CPPFLAGS=$CPPFLAGS_SAVED
   LIBS=$LIBS_SAVED
fi

if test "x${CRYPTO_LIBS}" != "x"
then
   CPPFLAGS_SAVED=$CPPFLAGS
   CPPFLAGS="$CRYPTO_INCLUDES $CPPFLAGS"
   LIBS_SAVED="$LIBS"
   LIBS="$LIBS $CRYPTO_LIBS"
   AC_LINK_IFELSE(
        [AC_LANG_PROGRAM([#include <botan/botan.h>
                          #include <botan/hash.h>
                         ],
                         [using namespace Botan;
                          LibraryInitializer::initialize();
                          HashFunction *h = get_hash("MD5");
                         ])],
        [AC_MSG_RESULT([checking for Botan library... yes])],
        [AC_MSG_RESULT([checking for Botan library... no])
         CRYPTO_INCLUDES=""
         CRYPTO_LIBS=""
         CRYPTO_LDFLAGS=""
         CRYPTO_RPATH=""
         AC_MSG_RESULT([Needs Botan library 1.8 or higher. On some systems,
         the botan package has a few missing dependencies (libbz2 and
         libgmp), if libbotan has been installed and you see this message,
         try upgrading to a higher version of botan or installing libbz2
         and libgmp.])]
   )
   CPPFLAGS=$CPPFLAGS_SAVED
   LIBS=$LIBS_SAVED
fi

if test "x${CRYPTO_LIBS}" != "x"
then
   CRYPTO_NAME="Botan"
   DISABLED_CRYPTO="OpenSSL"
   CRYPTO_PACKAGE="botan-1.8"
   CRYPTO_CFLAGS=""
   DISTCHECK_CRYPTO_CONFIGURE_FLAG="--with-botan=$botan_config"
   AC_DEFINE_UNQUOTED([WITH_BOTAN], [], [Compile with Botan crypto])
else
   CRYPTO_NAME="OpenSSL"
   DISABLED_CRYPTO="Botan"
   CRYPTO_PACKAGE="openssl-1.0.0"
   AC_DEFINE_UNQUOTED([WITH_OPENSSL], [], [Compile with OpenSSL crypto])
   AC_MSG_CHECKING(for OpenSSL library)
   # from bind9

   if test "${use_openssl}" = "auto" ; then
      use_openssl="yes"
   fi
   if test "${use_openssl}" = "yes" ; then
      for d in /usr /usr/local /usr/local/ssl /usr/pkg /usr/sfw; do
          if test -f $d/include/openssl/opensslv.h; then
             use_openssl=$d; break
          fi
      done
   fi
   if test "${use_openssl}" = "yes" ; then
      AC_MSG_ERROR([OpenSSL auto detection failed])
   fi
   if ! test -f "${use_openssl}"/include/openssl/opensslv.h ; then
      AC_MSG_ERROR([OpenSSL not found at ${use_openssl}])
   fi
   AC_MSG_RESULT(yes)
   if test "${use_openssl}" = "/usr" ; then
      CRYPTO_INCLUDES=""
      CRYPTO_LIBS="-lcrypto"
      DISTCHECK_CRYPTO_CONFIGURE_FLAG="--with-openssl"
      case "$host" in
          *-apple-darwin*)
              # Starting with OSX 10.7 (Lion) OpenSSL is deprecated
              CRYPTO_CFLAGS="-Wno-deprecated-declarations"
              ;;
          *)
              CRYPTO_CFLAGS=""
              ;;
      esac
   else
      CRYPTO_CFLAGS=""
      CRYPTO_INCLUDES="-I${use_openssl}/include"
      DISTCHECK_CRYPTO_CONFIGURE_FLAG="--with-openssl=${use_openssl}"
      case $host in
          *-solaris*)
              CRYPTO_LIBS="-L${use_openssl}/lib -R${use_openssl}/lib -lcrypto"
              ;;
          *-hp-hpux*)
              CRYPTO_LIBS="-L${use_openssl}/lib -Wl,+b: -lcrypto"
              ;;
          *-apple-darwin*)
              if test -f "${use_openssl}/lib/libcrypto.dylib" ; then
                 CRYPTO_LIBS="-L${use_openssl}/lib -lcrypto"
              else
                 CRYPTO_LIBS="${use_openssl}/lib/libcrypto.a"
              fi
              ;;
          *)
              CRYPTO_LIBS="-L${use_openssl}/lib -lcrypto"
              ;;
      esac
    fi
    dnl Determine the OpenSSL version
    AC_MSG_CHECKING([OpenSSL version])
    cat > conftest.cpp << EOF
#include <openssl/opensslv.h>
AUTOCONF_OPENSSL_VERSION=OPENSSL_VERSION_TEXT
EOF

    CRYPTO_VERSION=`$CPP $CPPFLAGS $CRYPTO_INCLUDES conftest.cpp | grep '^AUTOCONF_OPENSSL_VERSION=' | $SED -e 's/^AUTOCONF_OPENSSL_VERSION=//' -e 's/"//g' 2> /dev/null`
    if test -z "$CRYPTO_VERSION" ; then
       CRYPTO_VERSION="unknown"
    fi
    $RM -f conftest.cpp
    AC_MSG_RESULT([$CRYPTO_VERSION])
    #CRYPTO_LDFLAGS="-ldl"
    CRYPTO_LDFLAGS=""
    CRYPTO_RPATH=""
fi

AM_CONDITIONAL(HAVE_BOTAN, test "$CRYPTO_NAME" = "Botan")
AM_CONDITIONAL(HAVE_OPENSSL, test "$CRYPTO_NAME" = "OpenSSL")
AC_SUBST(CRYPTO_INCLUDES)
AC_SUBST(CRYPTO_CFLAGS)
AC_SUBST(CRYPTO_LIBS)
AC_SUBST(CRYPTO_LDFLAGS)
AC_SUBST(CRYPTO_PACKAGE)
AC_SUBST(CRYPTO_RPATH)
AC_SUBST(DISTCHECK_CRYPTO_CONFIGURE_FLAG)

# Check for MySql.  The path to the mysql_config program is given with
# the --with-mysql-config (default to /usr/bin/mysql-config).  By default,
# the software is not built with MySQL support enabled.
mysql_config="no"
AC_ARG_WITH([dhcp-mysql],
  AC_HELP_STRING([--with-dhcp-mysql=PATH],
    [path to the MySQL 'mysql_config' script (MySQL is used for the DHCP database)]),
    [mysql_config="$withval"])

if test "${mysql_config}" = "yes" ; then
    MYSQL_CONFIG="/usr/bin/mysql_config"
elif test "${mysql_config}" != "no" ; then
    MYSQL_CONFIG="${withval}"
fi

if test "$MYSQL_CONFIG" != "" ; then
    if test -d "$MYSQL_CONFIG" -o ! -x "$MYSQL_CONFIG" ; then
        AC_MSG_ERROR([--with-dhcp-mysql should point to a mysql_config program])
    fi

    MYSQL_CPPFLAGS=`$MYSQL_CONFIG --cflags`
    MYSQL_LIBS=`$MYSQL_CONFIG --libs`
    MYSQL_VERSION=`$MYSQL_CONFIG --version`

    AC_SUBST(MYSQL_CPPFLAGS)
    AC_SUBST(MYSQL_LIBS)

    # Check that a simple program using MySQL functions can compile and link.
    CPPFLAGS_SAVED="$CPPFLAGS"
    LIBS_SAVED="$LIBS"

    CPPFLAGS="$MYSQL_CPPFLAGS $CPPFLAGS"
    LIBS="$MYSQL_LIBS $LIBS"

    AC_LINK_IFELSE(
            [AC_LANG_PROGRAM([#include <mysql.h>],
                             [MYSQL mysql_handle;
                              (void) mysql_init(&mysql_handle);
                             ])],
            [AC_MSG_RESULT([checking for MySQL headers and library... yes])],
            [AC_MSG_RESULT([checking for MySQL headers and library... no])
             AC_MSG_ERROR([Needs MySQL library])]
    )

    CPPFLAGS=$CPPFLAGS_SAVED
    LIBS=$LIBS_SAVED

    # Note that MYSQL is present in the config.h file
    AC_DEFINE([HAVE_MYSQL], [1], [MySQL is present])
fi

# Solaris puts FIONREAD in filio.h
AC_CHECK_HEADERS(sys/filio.h,,,)

# ... and at the shell level, so Makefile.am can take action depending on this.
AM_CONDITIONAL(HAVE_MYSQL, test "$MYSQL_CONFIG" != "")

pg_config="no"
AC_ARG_WITH([dhcp-pgsql],
  AC_HELP_STRING([--with-dhcp-pgsql=PATH],
    [path to the PostgreSQL 'pg_config' script]),
    [pg_config="$withval"])

if test "${pg_config}" = "yes" ; then
    PG_CONFIG="/usr/bin/pg_config"
elif test "${pg_config}" != "no" ; then
    PG_CONFIG="${withval}"
fi

if test "$PG_CONFIG" != "" ; then
    if test -d "$PG_CONFIG" -o ! -x "$PG_CONFIG" ; then
        AC_MSG_ERROR([--with-dhcp-pgsql should point to a pg_config program])
    fi

    PGSQL_CPPFLAGS=`$PG_CONFIG --cppflags`
    PGSQL_INCLUDEDIR=`$PG_CONFIG --includedir`
    PGSQL_INCLUDEDIR_SERVER=`$PG_CONFIG --includedir-server`
    PGSQL_CPPFLAGS="$PGSQL_CPPFLAGS -I$PGSQL_INCLUDEDIR -I$PGSQL_INCLUDEDIR_SERVER"
    PGSQL_LIBS=`$PG_CONFIG --libdir`
    PGSQL_LIBS="-L$PGSQL_LIBS -lpq"
    PGSQL_VERSION=`$PG_CONFIG --version`

    AC_SUBST(PGSQL_CPPFLAGS)
    AC_SUBST(PGSQL_LIBS)

    # Check that a simple program using PostgreSQL functions can compile and link.
    CPPFLAGS_SAVED="$CPPFLAGS"
    LIBS_SAVED="$LIBS"

    CPPFLAGS="$PGSQL_CPPFLAGS $CPPFLAGS"
    LIBS="$PGSQL_LIBS $LIBS"

    AC_LINK_IFELSE(
            [AC_LANG_PROGRAM([#include <libpq-fe.h>],
                             [PGconn * c = PQconnectdb("dbname = 'postgres'");
                              PQfinish(c);])],
            [AC_MSG_RESULT([checking for PostgreSQL headers and library... yes])],
            [AC_MSG_RESULT([checking for PostgreSQL headers and library... no])
             AC_MSG_ERROR([Needs PostgreSQL library])]
    )

    CPPFLAGS=$CPPFLAGS_SAVED
    LIBS=$LIBS_SAVED

    # Note that PostgreSQL is present in the config.h file
    AC_DEFINE([HAVE_PGSQL], [1], [PostgreSQL is present])
fi

# ... and at the shell level, so Makefile.am can take action depending on this.
AM_CONDITIONAL(HAVE_PGSQL, test "$PG_CONFIG" != "")

# Check for log4cplus
log4cplus_path="yes"
AC_ARG_WITH([log4cplus],
  AC_HELP_STRING([--with-log4cplus=PATH],
    [specify exact directory of log4cplus library and headers]),
    [log4cplus_path="$withval"])
if test "${log4cplus_path}" = "no" ; then
    AC_MSG_ERROR([Need log4cplus])
elif test "${log4cplus_path}" != "yes" ; then
  LOG4CPLUS_INCLUDES="-I${log4cplus_path}/include"
  LOG4CPLUS_LIBS="-L${log4cplus_path}/lib"
else
# If not specified, try some common paths.
	log4cplusdirs="/usr/local /usr/pkg /opt /opt/local"
	for d in $log4cplusdirs
	do
		if test -f $d/include/log4cplus/logger.h; then
			LOG4CPLUS_INCLUDES="-I$d/include"
			LOG4CPLUS_LIBS="-L$d/lib"
			break
		fi
	done
fi

LOG4CPLUS_LIBS="$LOG4CPLUS_LIBS -llog4cplus $MULTITHREADING_FLAG"

AC_SUBST(LOG4CPLUS_LIBS)
AC_SUBST(LOG4CPLUS_INCLUDES)

CPPFLAGS_SAVED=$CPPFLAGS
CPPFLAGS="$LOG4CPLUS_INCLUDES $CPPFLAGS"
LIBS_SAVED="$LIBS"
LIBS="$LOG4CPLUS_LIBS $LIBS"

AC_CHECK_HEADERS([log4cplus/logger.h],,AC_MSG_ERROR([Missing required header files.]))
AC_LINK_IFELSE(
        [AC_LANG_PROGRAM([#include <log4cplus/logger.h>
                         ],
                         [using namespace log4cplus;
                          Logger logger = Logger::getInstance("main");
                         ])],
        [AC_MSG_RESULT([checking for log4cplus library... yes])],
        [AC_MSG_RESULT([checking for log4cplus library... no])
         AC_MSG_ERROR([Needs log4cplus library])]
)

dnl Determine the log4cplus version, used mainly for config.report.
AC_MSG_CHECKING([log4cplus version])
cat > conftest.cpp << EOF
#include <log4cplus/version.h>
AUTOCONF_LOG4CPLUS_VERSION=LOG4CPLUS_VERSION_STR
EOF

LOG4CPLUS_VERSION=`$CPP $CPPFLAGS conftest.cpp | grep '^AUTOCONF_LOG4CPLUS_VERSION=' | $SED -e 's/^AUTOCONF_LOG4CPLUS_VERSION=//' -e 's/[[ 	]]//g' -e 's/"//g' 2> /dev/null`
if test -z "$LOG4CPLUS_VERSION"; then
  LOG4CPLUS_VERSION="unknown"
fi
$RM -f conftest.cpp
AC_MSG_RESULT([$LOG4CPLUS_VERSION])

CPPFLAGS=$CPPFLAGS_SAVED
LIBS=$LIBS_SAVED

#
# Configure Boost header path
#
AX_BOOST_FOR_KEA
# Boost offset_ptr is required in one library and not optional right now, so
# we unconditionally fail here if it doesn't work.
if test "$BOOST_OFFSET_PTR_WOULDFAIL" = "yes" -a "$werror_ok" = 1; then
    AC_MSG_ERROR([Failed to compile a required header file.  Try upgrading Boost to 1.44 or higher (when using clang++) or specifying --without-werror.  See the ChangeLog entry for Trac no. 2147 for more details.])
fi

if test "$BOOST_STATIC_ASSERT_WOULDFAIL" = "yes" -a X"$werror_ok" = X1; then
    AC_MSG_ERROR([Failed to use Boost static assertions. Try upgrading Boost to 1.54 or higher (when using GCC 4.8) or specifying --without-werror.  See trac ticket no. 3039 for more details.])
fi

# There's a known bug in FreeBSD ports for Boost that would trigger a false
# warning in build with g++ and -Werror (we exclude clang++ explicitly to
# avoid unexpected false positives).
if test "$BOOST_NUMERIC_CAST_WOULDFAIL" = "yes" -a X"$werror_ok" = X1 -a $CLANGPP = "no"; then
    AC_MSG_ERROR([Failed to compile a required header file.  If you are using FreeBSD and Boost installed via ports, retry with specifying --without-werror.  See the ChangeLog entry for Trac no. 1991 for more details.])
fi

use_shared_memory=yes
AC_ARG_WITH(shared-memory,
    AC_HELP_STRING([--with-shared-memory],
    [Build with Boost shared memory support; for large scale authoritative DNS servers]),
    [use_shared_memory=$withval])
if test X$use_shared_memory = Xyes -a "$BOOST_MAPPED_FILE_WOULDFAIL" = "yes" -a "$want_dns" = "yes"; then
    AC_MSG_ERROR([Boost shared memory does not compile on this system.  If you don't need it (most normal users won't) build without it by rerunning this script with --without-shared-memory; using a different compiler or a different version of Boost may also help.])
fi
AM_CONDITIONAL([USE_SHARED_MEMORY], [test x$use_shared_memory = xyes])
if test "x$use_shared_memory" = "xyes"; then
    AC_DEFINE(USE_SHARED_MEMORY, 1, [Define to 1 if shared memory support is enabled])
fi
AC_SUBST(BOOST_MAPPED_FILE_CXXFLAG)

if test "$BOOST_OFFSET_PTR_OLD" = "yes" -a "$use_shared_memory" = "yes" -a "$want_dns" = "yes"; then
    AC_MSG_ERROR([You're trying to compile against boost older than 1.48 with
shared memory. Older versions of boost have a bug which causes segfaults in
offset_ptr implementation when compiled by GCC with optimisations enabled.
See ticket no. 3025 for details.

Either update boost to newer version or use --without-shared-memory.
Note that most users likely don't need shared memory support.
])
fi

# Add some default CPP flags needed for Boost, identified by the AX macro.
CPPFLAGS="$CPPFLAGS $CPPFLAGS_BOOST_THREADCONF"

# I can't get some of the #include <asio.hpp> right without this
# TODO: find the real cause of asio/boost wanting pthreads
# (this currently only occurs for src/lib/cc/session_unittests)
PTHREAD_LDFLAGS=
AC_CHECK_LIB(pthread, pthread_create,[ PTHREAD_LDFLAGS=-lpthread ], [])
AC_SUBST(PTHREAD_LDFLAGS)
AC_SUBST(MULTITHREADING_FLAG)

#
# Check availability of gtest, which will be used for unit tests.
#
GTEST_LDFLAGS=
GTEST_LDADD=
DISTCHECK_GTEST_CONFIGURE_FLAG=
GTEST_VERSION="unknown"

if test "x$enable_gtest" = "xyes" ; then

    DISTCHECK_GTEST_CONFIGURE_FLAG="--with-gtest=$gtest_path"

    if test -n "$with_gtest_source" ; then

          if test "x$GTEST_SOURCE" = "xyes" ; then

            AC_MSG_CHECKING([for gtest source])
            # If not specified, try some common paths.
            GTEST_SOURCE=
            for d in /usr/src/gtest /usr/local /usr/pkg /opt /opt/local ; do
                if test -f $d/src/gtest-all.cc -a $d/src/gtest_main.cc; then
                    GTEST_SOURCE=$d
                    AC_MSG_RESULT([$GTEST_SOURCE])
                    break
                fi
            done
            if test -z $GTEST_SOURCE ; then
                AC_MSG_ERROR([no gtest source but it was selected])
            fi
         else
            AC_CHECK_FILES([$GTEST_SOURCE/src/gtest-all.cc]
               [$GTEST_SOURCE/src/gtest_main.cc],
               [have_gtest_source=yes],
               [AC_MSG_ERROR([no gtest source at $GTEST_SOURCE])])
          fi
          have_gtest_source=yes
          GTEST_LDFLAGS="\$(top_builddir)/libgtest.a"
          DISTCHECK_GTEST_CONFIGURE_FLAG="--with-gtest-source=$GTEST_SOURCE"
          GTEST_INCLUDES="-I$GTEST_SOURCE -I$GTEST_SOURCE/include"
          # See $GTEST_SOURCE/include/gtest/internal/gtest-port.h
          # about GTEST_HAS_PTHREAD.
          case "$host" in
            *-solaris*|*-linux*|*-hpux*)
                GTEST_LDADD="$GTEST_LDADD $PTHREAD_LDFLAGS"
                ;;
          esac
        fi

if test "$gtest_path" != "no" ; then
    if test "$gtest_path" != "yes"; then
        GTEST_PATHS=$gtest_path
        if test -x "${gtest_path}/bin/gtest-config" ; then
            GTEST_CONFIG="${gtest_path}/bin/gtest-config"
        fi
    else
        AC_PATH_PROG([GTEST_CONFIG], [gtest-config])
    fi
    if test -x "${GTEST_CONFIG}" ; then :
        # using cppflags instead of cxxflags
        GTEST_INCLUDES=`${GTEST_CONFIG} --cppflags`
        GTEST_LDFLAGS=`${GTEST_CONFIG} --ldflags`
        GTEST_LDADD=`${GTEST_CONFIG} --libs`
        GTEST_VERSION=`${GTEST_CONFIG} --version`
        GTEST_FOUND="true"
    else
        AC_MSG_WARN([Unable to locate Google Test gtest-config.])
        if test -z "${GTEST_PATHS}" ; then
            GTEST_PATHS="/usr /usr/local"
        fi
        GTEST_FOUND="false"
    fi
    if test "${GTEST_FOUND}" != "true"; then
        GTEST_FOUND="false"
        for dir in $GTEST_PATHS; do
            if test -f "$dir/include/gtest/gtest.h"; then
                GTEST_INCLUDES="-I$dir/include"
                GTEST_LDFLAGS="-L$dir/lib"
                GTEST_LDADD="-lgtest"
                GTEST_FOUND="true"
                # There is no gtest-config script on this
                # system, which is supposed to inform us
                # whether we need pthreads as well (a
                # gtest compile-time option). So we still
                # need to test that manually.
                CPPFLAGS_SAVED="$CPPFLAGS"
                CPPFLAGS="$CPPFLAGS $GTEST_INCLUDES"
                LDFLAGS_SAVED="$LDFLAGS"
                LDFLAGS="$LDFLAGS $GTEST_LDFLAGS"
                LIBS_SAVED=$LIBS
                LIBS="$LIBS $GTEST_LDADD"
                AC_MSG_CHECKING([Checking whether gtest tests need pthreads])
                # First try to compile without pthreads
                AC_TRY_LINK([
                    #include <gtest/gtest.h>
                    ],[
                        int i = 0;
                        char* c = NULL;
                        ::testing::InitGoogleTest(&i, &c);
                        return (0);
                    ],
                    [ AC_MSG_RESULT(no) ],
                    [
                        LIBS="$SAVED_LIBS $GTEST_LDADD $PTHREAD_LDFLAGS"
                        # Now try to compile with pthreads
                        AC_TRY_LINK([
                            #include <gtest/gtest.h>
                            ],[
                                int i = 0;
                                char* c = NULL;
                                ::testing::InitGoogleTest(&i, &c);
                                return (0);
                            ],
                            [ AC_MSG_RESULT(yes)
                              GTEST_LDADD="$GTEST_LDADD $PTHREAD_LDFLAGS"
                            ],
                            # Apparently we can't compile it at all
                            [ AC_MSG_ERROR(unable to compile with gtest) ])
                ])
                CPPFLAGS=$CPPFLAGS_SAVED
                LDFLAGS=$LDFLAGS_SAVED
                LIBS=$LIBS_SAVED
                break
            fi
        done
    fi
    if test "${GTEST_FOUND}" != "true"; then
        AC_MSG_ERROR([Cannot find gtest in: $GTEST_PATHS])
    fi

  fi
fi
AM_CONDITIONAL(HAVE_GTEST, test $enable_gtest != "no")
AM_CONDITIONAL(HAVE_GTEST_SOURCE, test "X$have_gtest_source" = "Xyes")
AC_SUBST(DISTCHECK_GTEST_CONFIGURE_FLAG)
AC_SUBST(GTEST_INCLUDES)
AC_SUBST(GTEST_LDFLAGS)
AC_SUBST(GTEST_LDADD)
AC_SUBST(GTEST_SOURCE)

#
# ASIO: we extensively use it as the C++ event management module.
#
# Use local ASIO headers from ext
#
CPPFLAGS="$CPPFLAGS -I\$(top_srcdir)/ext/asio"
#
# Use our 'coroutine' header from ext
CPPFLAGS="$CPPFLAGS -I\$(top_srcdir)/ext/coroutine"
#
# Disable threads: Currently we don't use them.
CPPFLAGS="$CPPFLAGS -DASIO_DISABLE_THREADS=1"

# Check for functions that are not available on all platforms
AC_CHECK_FUNCS([pselect])

# /dev/poll issue: ASIO uses /dev/poll by default if it's available (generally
# the case with Solaris).  Unfortunately its /dev/poll specific code would
# trigger the gcc's "missing-field-initializers" warning, which would
# subsequently make the build fail with -Werror.  Further, older versions of
# gcc don't provide an option to selectively suppress this warning.
# So, for the moment, we simply disable the use of /dev/poll.  Unless we
# implement recursive DNS server with randomized ports, we don't need the
# scalability that /dev/poll can provide, so this decision wouldn't affect
# run time performance.  Hopefully we can find a better solution or the ASIO
# code will be updated by the time we really need it.
AC_CHECK_HEADERS(sys/devpoll.h, ac_cv_have_devpoll=yes, ac_cv_have_devpoll=no)
if test "X$ac_cv_have_devpoll" = "Xyes" -a "X$GXX" = "Xyes"; then
	CPPFLAGS="$CPPFLAGS -DASIO_DISABLE_DEV_POLL=1"
fi

#
# Perl is optional; it is used only by some of the system test scripts.
#
AC_PATH_PROGS(PERL, perl5 perl)
AC_SUBST(PERL)
AC_PATH_PROGS(AWK, gawk awk)
AC_SUBST(AWK)


# Kea configuration backend section
# Currently there are 2 backends available: BUNDY and JSON
# It is possible that we may extend this to accept additional backends.
AC_ARG_WITH(kea-config,
    AC_HELP_STRING([--with-kea-config],
    [Selects configuration backend; currently available options are: BUNDY
    (Kea reads configuration and commands from Bundy framework) or JSON (default,
    Kea reads configuration from a JSON file from disk)]),
    [CONFIG_BACKEND="$withval"],
    [CONFIG_BACKEND=JSON])

AM_CONDITIONAL(CONFIG_BACKEND_BUNDY, test "x$CONFIG_BACKEND" = "xBUNDY")
AM_CONDITIONAL(CONFIG_BACKEND_JSON,   test "x$CONFIG_BACKEND" = "xJSON")

if test "x$CONFIG_BACKEND" = "xBUNDY"; then
    AC_DEFINE(CONFIG_BACKEND_BUNDY, 1, [Define to 1 if Kea config was set to BUNDY])
fi

if test "x$CONFIG_BACKEND" = "xJSON"; then
    AC_DEFINE(CONFIG_BACKEND_JSON, 1, [Define to 1 if Kea config was set to JSON])
fi

# Let's sanity check if the specified backend value is allowed
if test "x$CONFIG_BACKEND" != "xBUNDY" && test "x$CONFIG_BACKEND" != "xJSON"; then
   AC_MSG_ERROR("Invalid configuration backend specified: $CONFIG_BACKEND. The only supported are: BUNDY JSON")
fi

AC_ARG_ENABLE(generate_docs, [AC_HELP_STRING([--enable-generate-docs],
  [regenerate documentation using Docbook [default=no]])],
  enable_generate_docs=$enableval, enable_generate_docs=no)

if test "x$enable_generate_docs" != xno ; then
  if test "$PYTHON" == "no" ; then
    AC_MSG_ERROR("Python3 is required for enable-generate-docs")
  fi

# Check for xsltproc
  AC_PATH_PROG([XSLTPROC], [xsltproc])
  if test -z "$XSLTPROC"; then
    AC_MSG_ERROR("xsltproc not found; it is required for --enable-generate-docs")
  else
    AC_MSG_CHECKING([if $XSLTPROC works])
    # run xsltproc to see if works
    $XSLTPROC --novalid --xinclude --nonet http://docbook.sourceforge.net/release/xsl/current/manpages/docbook.xsl
    if test $? -ne 0 ; then
      AC_MSG_ERROR("Error with $XSLTPROC using release/xsl/current/manpages/docbook.xsl")
    fi
    $XSLTPROC --novalid --xinclude --nonet http://docbook.sourceforge.net/release/xsl/current/html/docbook.xsl
    if test $? -ne 0 ; then
      AC_MSG_ERROR("Error with $XSLTPROC using release/xsl/current/html/docbook.xsl")
    fi
    AC_MSG_RESULT(yes)
  fi

  AC_PATH_PROG([ELINKS], [elinks])
  if test -z "$ELINKS"; then
    AC_MSG_ERROR("elinks not found; it is required for --enable-generate-docs")
  fi
fi


AM_CONDITIONAL(GENERATE_DOCS, test x$enable_generate_docs != xno)

AC_ARG_ENABLE(install-configurations,
  [AC_HELP_STRING([--disable-install-configurations],
  [do not install configuration])], install_configurations=$enableval, install_configurations=yes)

AM_CONDITIONAL(INSTALL_CONFIGURATIONS, test x$install_configurations = xyes || test x$install_configurations = xtrue)

AC_ARG_ENABLE(logger-checks, [AC_HELP_STRING([--enable-logger-checks],
  [check logger messages [default=no]])], enable_logger_checks=$enableval, enable_logger_checks=no)
AM_CONDITIONAL(ENABLE_LOGGER_CHECKS, test x$enable_logger_checks != xno)
AM_COND_IF([ENABLE_LOGGER_CHECKS], [AC_DEFINE([ENABLE_LOGGER_CHECKS], [1], [Check logger messages?])])

# Check for asciidoc
AC_PATH_PROG(ASCIIDOC, asciidoc, no)
AM_CONDITIONAL(HAVE_ASCIIDOC, test "x$ASCIIDOC" != "xno")

# Check for plantuml
AC_PATH_PROG(PLANTUML, plantuml, no)
AM_CONDITIONAL(HAVE_PLANTUML, test "x$PLANTUML" != "xno")

# Check for valgrind
AC_PATH_PROG(VALGRIND, valgrind, no)
AM_CONDITIONAL(HAVE_VALGRIND, test "x$VALGRIND" != "xno")

# Also check for valgrind headers
# We could consider adding them to the source code tree, as this
# is the encouraged method of using them; they are BSD-licensed.
# However, until we find that this is a problem, we just use
# the system-provided ones, if available
AC_CHECK_HEADERS(valgrind/valgrind.h, [AC_DEFINE([HAVE_VALGRIND_HEADERS], [1], [Check valgrind headers])])