configure.ac

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

AC_PREREQ([2.59])
AC_INIT(bind10, 20130529, bind10-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

# 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([BIND 10 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 weare 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 (we share the AX function defined in
#  examples/m4)
AX_ISC_RPATH

# Compiler dependent settings: define some mandatory CXXFLAGS here.
# We also use a separate variable B10_CXXFLAGS.  This will (and should) be
# used as the default value for each specific AM_CXXFLAGS:
# AM_CXXFLAGS = $(B10_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([BIND10_CXX_TRY_FLAG], [
  AC_MSG_CHECKING([whether $CXX supports $1])

  bind10_save_CXXFLAGS="$CXXFLAGS"
  CXXFLAGS="$CXXFLAGS $1"

  AC_LINK_IFELSE([AC_LANG_SOURCE([int main(void){ return 0;}])],
                 [bind10_cxx_flag=yes], [bind10_cxx_flag=no])
  CXXFLAGS="$bind10_save_CXXFLAGS"

  if test "x$bind10_cxx_flag" = "xyes"; then
    ifelse([$2], , :, [$2])
  else
    ifelse([$3], , :, [$3])
  fi

  AC_MSG_RESULT([$bind10_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`
B10_CXXFLAGS="$B10_CXXFLAGS -Qunused-arguments"
fi

BIND10_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`
B10_CXXFLAGS="$B10_CXXFLAGS -Wall -Wextra -Wnon-virtual-dtor -Wwrite-strings -Woverloaded-virtual -Wno-sign-compare"
case "$host" in
*-solaris*)
	MULTITHREADING_FLAG=-pthreads
	# In Solaris, IN6ADDR_ANY_INIT and IN6ADDR_LOOPBACK_INIT need -Wno-missing-braces
	B10_CXXFLAGS="$B10_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 $B10_CXXFLAGS -Werror"
   AC_MSG_CHECKING(for in-TU anonymous namespace breakage)
   # We use struct, not class, here, because some compilers complain about
   # "unused private members", causing a false positive.
   AC_TRY_COMPILE([namespace { struct Foo {}; }
   namespace isc {struct Bar {Foo foo_;};} ],,
	[AC_MSG_RESULT(no)
	 werror_ok=1
	 B10_CXXFLAGS="$B10_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], [BIND 10 was 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([BIND 10 requires shared libraries to be built])
fi

# allow configuring without setproctitle.
AC_ARG_ENABLE(setproctitle-check,
AC_HELP_STRING([--disable-setproctitle-check],
  [do not check for python setproctitle module (used to give nice names to python processes)]),
  setproctitle_check=$enableval, setproctitle_check=yes)

# OS dependent configuration
SET_ENV_LIBRARY_PATH=no
ENV_LIBRARY_PATH=LD_LIBRARY_PATH
bind10_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="$LDFLAGS -z now"
	# Destroying locked mutexes, condition variables being waited
	# on, etc. are undefined behavior on Solaris, so we set it as
	# such here.
	bind10_undefined_pthread_behavior=yes
	;;
*-apple-darwin*)
	# Starting with OSX 10.7 (Lion) we must choose which IPv6 API to use
	# (RFC2292 or RFC3542).
	CPPFLAGS="$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.
	# Testing a specific system and version is not a good practice, but
	# identifying this behavior would be too heavy (running a program
	# with multiple threads), so this is a compromise.  In general,
	# it should be avoided to rely on 'osx_version' unless there's no
	# viable alternative.
	osx_version=`/usr/bin/sw_vers -productVersion`
	if [ test $osx_version = "10.9" ]; then
		bind10_undefined_pthread_behavior=yes
	fi

	# 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 $bind10_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 python3.3 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])
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

# We need to store the default pyexecdir in a separate variable so that
# we can specify in Makefile.am the install directory of various BIND 10
# python scripts and loadable modules; in Makefile.am we cannot replace
# $(pyexecdir) using itself, e.g, this doesn't work:
# pyexecdir = $(pyexecdir)/isc/some_module
# The separate variable makes this setup possible as follows:
# pyexecdir = $(PYTHON_SITEPKG_DIR)/isc/some_module
PYTHON_SITEPKG_DIR=${pyexecdir}
AC_SUBST(PYTHON_SITEPKG_DIR)

# This will be commonly used in various Makefile.am's that need to generate
# python log messages.
PYTHON_LOGMSGPKG_DIR="\$(top_builddir)/src/lib/python/isc/log_messages"
AC_SUBST(PYTHON_LOGMSGPKG_DIR)

# This is python package paths commonly used in python tests.  See
# README of log_messages for why it's included.
# lib/dns/python/.libs is necessary because __init__.py of isc package
# automatically imports isc.datasrc, which then requires the DNS loadable
# module.  #2145 should eliminate the need for it.
COMMON_PYTHON_PATH="\$(abs_top_builddir)/src/lib/python/isc/log_messages:\$(abs_top_builddir)/src/lib/python/isc/cc:\$(abs_top_srcdir)/src/lib/python:\$(abs_top_builddir)/src/lib/python:\$(abs_top_builddir)/src/lib/dns/python/.libs"
AC_SUBST(COMMON_PYTHON_PATH)

# Check for python development environments
if test -x ${PYTHON}-config; then
	PYTHON_INCLUDES=`${PYTHON}-config --includes`

	# Add any '-L..." flags to PYTHON_LDFLAGS.  We first make a copy of
	# python-config --ldflags, removing any spaces and tabs
	# between "-L" and its argument (some instances of python-config
	# insert a space, which would confuse the code below).
	# Notes: if -L isn't contained at all we can simply skip this process,
	# so we only go through the flag if it's contained; also, protecting
	# the output with [] seems necessary for environment to avoid getting
	# an empty output accidentally.
	python_config_ldflags=[`${PYTHON}-config --ldflags | ${SED} -ne 's/\([ \t]*-L\)[ ]*\([^ \t]*[ \t]*\)/\1\2/gp'`]
	for flag in $python_config_ldflags; do
		flag=`echo $flag | ${SED} -ne 's/^\(\-L.*\)$/\1/p'`
		if test "X${flag}" != X; then
			PYTHON_LDFLAGS="$PYTHON_LDFLAGS ${flag}"
		fi
	done
	# on some platforms, ${PYTHON}-config --ldflags doesn't provide a -L
	# option while having the library under a non trivial directory.
	# as a workaround we try the "lib" sub directory under the common
	# prefix for this python.
	if test -z "${PYTHON_LDFLAGS}"; then
		PYTHON_LDFLAGS="-L`${PYTHON}-config --prefix`/lib"
	fi
else
	if test "X$PYTHON_INCLUDES" = X -o "X$PYTHON_LDFLAGS" = X; then
		AC_MSG_WARN([${PYTHON}-config does not exist or is not executable, so we could not detect python development environment.  Your system may require an additional package (e.g. "python3-dev").  Alternatively, if you are sure you have python headers and libraries, define PYTHON_INCLUDES and PYTHON_LDFLAGS and run this script.])
	fi
fi

# Some OSes including NetBSD don't install libpython.so in a well known path.
# To avoid requiring dynamic library path with our python wrapper loadable
# modules, we embed the path to the modules when possible.  We do this even
# when the path is known in the common operational environment (e.g. when
# it's stored in a common "hint" file) for simplicity.
if test "x$ISC_RPATH_FLAG" != "x"; then
	python_rpath=
	for flag in ${PYTHON_LDFLAGS}; do
		python_rpath="${python_rpath} `echo $flag | ${SED} -ne "s/^\(\-L\)/${ISC_RPATH_FLAG}/p"`"
	done
	PYTHON_LDFLAGS="${PYTHON_LDFLAGS} ${python_rpath}"
fi

AC_SUBST(PYTHON_INCLUDES)
AC_SUBST(PYTHON_LDFLAGS)

CPPFLAGS_SAVED="$CPPFLAGS"
CPPFLAGS="$CPPFLAGS ${PYTHON_INCLUDES}"
AC_CHECK_HEADERS([Python.h],, AC_MSG_ERROR([Missing Python.h]))
CPPFLAGS="$CPPFLAGS_SAVED"

# Check for python library.  Needed for Python-wrapper libraries.
LDFLAGS_SAVED="$LDFLAGS"
LDFLAGS="$LDFLAGS $PYTHON_LDFLAGS"
python_bin="python${PYTHON_VERSION}"
AC_CHECK_LIB($python_bin, main, python_lib=$python_bin, python_lib=no)
if test $python_lib != "no"; then
	PYTHON_LIB="-l$python_lib"
fi
AC_SUBST(PYTHON_LIB)
LDFLAGS=$LDFLAGS_SAVED

# Python 3.2 changed the return type of internal hash function to
# Py_hash_t and some platforms (such as Solaris) strictly check for long
# vs Py_hash_t. So we detect and use the appropriate return type.
# Remove this test (and associated changes in pydnspp_config.h.in) when
# we require Python 3.2.
have_py_hash_t=0
CPPFLAGS_SAVED="$CPPFLAGS"
CPPFLAGS=${PYTHON_INCLUDES}
AC_MSG_CHECKING(for Py_hash_t)
AC_TRY_COMPILE([#include <Python.h>
                Py_hash_t h;],,
    [AC_MSG_RESULT(yes)
     have_py_hash_t=1],
    [AC_MSG_RESULT(no)])
CPPFLAGS="$CPPFLAGS_SAVED"
HAVE_PY_HASH_T=$have_py_hash_t
AC_SUBST(HAVE_PY_HASH_T)

# Check for the setproctitle module
if test "$setproctitle_check" = "yes" ; then
    AC_MSG_CHECKING(for setproctitle module)
    if "$PYTHON" -c 'import setproctitle' 2>/dev/null ; then
        AC_MSG_RESULT(ok)
    else
        AC_MSG_RESULT(missing)
        AC_MSG_WARN([Missing setproctitle python module.
Use --disable-setproctitle-check to skip this check.
In this case we will continue, but naming of python processes will not work.])
    fi
fi

# (g++ only check)
# Python 3.2 has an unused parameter in one of its headers. This
# has been reported, but not fixed as of yet, so we check if we need
# to set -Wno-unused-parameter.
if test "X$GXX" = "Xyes" -a "$werror_ok" = 1; then
	CPPFLAGS_SAVED="$CPPFLAGS"
	CPPFLAGS=${PYTHON_INCLUDES}
	CXXFLAGS_SAVED="$CXXFLAGS"
	CXXFLAGS="$CXXFLAGS $B10_CXXFLAGS -Werror"
	AC_MSG_CHECKING([whether we need -Wno-unused-parameter for python])
	AC_TRY_COMPILE(
		[#include <Python.h>],
		[],
		[AC_MSG_RESULT(no)],
		[
		CXXFLAGS="$CXXFLAGS -Wno-unused-parameter"
		AC_TRY_COMPILE([#include <Python.h>],
		[],
		[AC_MSG_RESULT(yes)
		 PYTHON_CXXFLAGS="${PYTHON_CXXFLAGS} -Wno-unused-parameter"
		 AC_SUBST(PYTHON_CXXFLAGS)
		],
		[AC_MSG_ERROR([Can't compile against Python.h.  If you're using MacOS X and have installed Python with Homebrew, see http://bind10.isc.org/wiki/SystemNotesMacOSX])]
                )
                ]
	)
	CXXFLAGS="$CXXFLAGS_SAVED"
	CPPFLAGS="$CPPFLAGS_SAVED"
fi

# produce PIC unless we disable shared libraries. need this for python bindings.
if test $enable_shared != "no" -a "X$GXX" = "Xyes"; then
   B10_CXXFLAGS="$B10_CXXFLAGS -fPIC"
fi

AC_SUBST(B10_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))

AC_ARG_WITH(pycoverage,
[  --with-pycoverage[=PROGRAM]         enable python code coverage using the specified coverage], pycoverage="$withval", pycoverage="no")
if test "$pycoverage" = "no" ; then
	# just run the tests normally with python
	PYCOVERAGE_RUN="${PYTHON}"
	USE_PYCOVERAGE="no"
elif test "$pycoverage" = "yes" ; then
	PYCOVERAGE="coverage"
	PYCOVERAGE_RUN="${PYCOVERAGE} run --branch --append"
	USE_PYCOVERAGE="yes"
else
	PYCOVERAGE="$pycoverage"
	PYCOVERAGE_RUN="${PYCOVERAGE} run --branch --append"
	USE_PYCOVERAGE="yes"
fi
AM_CONDITIONAL(ENABLE_PYTHON_COVERAGE, test x$USE_PYCOVERAGE != xno)
AC_SUBST(PYCOVERAGE)
AC_SUBST(PYCOVERAGE_RUN)
AC_SUBST(USE_PYCOVERAGE)

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"
])

# 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 ${BOTAN_TOOL}; then
            BOTAN_LIBS=`$BOTAN_TOOL $TOOL_ARG --libs`
            LIBS_SAVED=${LIBS}
            LIBS="$LIBS $BOTAN_LIBS"
            BOTAN_INCLUDES=`$BOTAN_TOOL $TOOL_ARG --cflags`
            CPPFLAGS_SAVED=${CPPFLAGS}
            CPPFLAGS="$BOTAN_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"
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
    AC_MSG_ERROR([Need botan for libcryptolink])
fi
if 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${BOTAN_CONFIG}" != "x"
then
    BOTAN_LIBS=`${BOTAN_CONFIG} --libs`
    BOTAN_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 BOTAN_INCLUDES (but using include instead of lib) below.
    if [ ${BOTAN_CONFIG} --prefix >/dev/null 2>&1 ] ; then
        echo ${BOTAN_LIBS} | grep -- -L > /dev/null || \
            BOTAN_LIBS="-L`${BOTAN_CONFIG} --prefix`/lib ${BOTAN_LIBS}"
        echo ${BOTAN_INCLUDES} | grep -- -I > /dev/null || \
            BOTAN_INCLUDES="-I`${BOTAN_CONFIG} --prefix`/include ${BOTAN_INCLUDES}"
    fi
fi

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

BOTAN_VERSION=`$CPP $CPPFLAGS $BOTAN_INCLUDES conftest.cpp | grep '^AUTOCONF_BOTAN_VERSION=' | $SED -e 's/^AUTOCONF_BOTAN_VERSION=//' -e 's/[[ 	]]//g' -e 's/"//g' 2> /dev/null`
if test -z "$BOTAN_VERSION"; then
  BOTAN_VERSION="unknown"
fi
$RM -f conftest.cpp
AC_MSG_RESULT([$BOTAN_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
BOTAN_LDFLAGS=
BOTAN_NEWLIBS=
for flag in ${BOTAN_LIBS}; do
    BOTAN_LDFLAGS="${BOTAN_LDFLAGS} `echo $flag | ${SED} -ne '/^\(\-L\)/p'`"
    BOTAN_LIBS="${BOTAN_LIBS} `echo $flag | ${SED} -ne '/^\(\-l\)/p'`"
done

# See python_rpath for some info on why we do this
if test "x$ISC_RPATH_FLAG" != "x"; then
    BOTAN_RPATH=
    for flag in ${BOTAN_LIBS}; do
            BOTAN_RPATH="${BOTAN_RPATH} `echo $flag | ${SED} -ne "s/^\(\-L\)/${ISC_RPATH_FLAG}/p"`"
    done
AC_SUBST(BOTAN_RPATH)

# 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="$BOTAN_RPATH $LDFLAGS"
fi

AC_SUBST(BOTAN_LDFLAGS)
AC_SUBST(BOTAN_LIBS)
AC_SUBST(BOTAN_INCLUDES)
# 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=$CPPFLAGS
CPPFLAGS="$BOTAN_INCLUDES $CPPFLAGS"
LIBS_SAVED="$LIBS"
LIBS="$LIBS $BOTAN_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],,[
	if test "x$ac_header_preproc" = "xyes"; then
		AC_MSG_ERROR([
botan/botan.h was found but is unusable. The most common cause of this problem
is attempting to use an updated C++ compiler with older C++ libraries, such as
the version of Botan that comes with your distribution. If you have updated
your C++ compiler we highly recommend that you use support libraries such as
Boost and Botan that were compiled with the same compiler version.])
	else
		AC_MSG_ERROR([Missing required header files.])
	fi]
)
AC_LINK_IFELSE(
        [AC_LANG_PROGRAM([#include <botan/botan.h>
                          #include <botan/hash.h>
                         ],
                         [using namespace Botan;
                          LibraryInitializer::initialize();
                          HashFunction *h = get_hash("MD5");
                         ])],
        [AC_MSG_RESULT([checking for Botan library... yes])],
        [AC_MSG_RESULT([checking for Botan library... no])
         AC_MSG_ERROR([Needs Botan library 1.8 or higher. On some systems,
         the botan package has a few missing dependencies (libbz2 and
         libgmp), if libbotan has been installed and you see this error,
         try upgrading to a higher version of botan or installing libbz2
         and libgmp.])]
)
CPPFLAGS=$CPPFLAGS_SAVED
LIBS=$LIBS_SAVED

# 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

# ... and at the shell level, so Makefile.am can take action depending on this.
AM_CONDITIONAL(HAVE_MYSQL, test "$MYSQL_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_BIND10
# 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

build_experimental_resolver=no
AC_ARG_ENABLE(experimental-resolver,
  [AC_HELP_STRING([--enable-experimental-resolver],
  [enable building of the experimental resolver [default=no]])],
  [build_experimental_resolver=$enableval])
AM_CONDITIONAL([BUILD_EXPERIMENTAL_RESOLVER], [test "$build_experimental_resolver" = "yes"])
if test "$build_experimental_resolver" = "yes"; then
   BUILD_EXPERIMENTAL_RESOLVER=yes
else
   BUILD_EXPERIMENTAL_RESOLVER=no
fi
AC_SUBST(BUILD_EXPERIMENTAL_RESOLVER)

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 "$BOOST_MAPPED_FILE_WOULDFAIL" = "yes"; then
    AC_MSG_ERROR([Boost shared memory does not compile on this system.  If you don't need it (most normal users won't) build without it by rerunning this script with --without-shared-memory; using a different compiler or a different version of Boost may also help.])
fi
AM_CONDITIONAL([USE_SHARED_MEMORY], [test x$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" ; 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`