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	dnl
	dnl autoconf for Pacemaker
	dnl
	dnl Copyright 2009-2024 the Pacemaker project contributors
	dnl
	dnl The version control history for this file may have further details.
	dnl
	dnl This source code is licensed under the GNU General Public License version 2
	dnl or later (GPLv2+) WITHOUT ANY WARRANTY.


	dnl ==============================================
	dnl Bootstrap autotools
	dnl ==============================================

	# Require a minimum version of autoconf itself
	AC_PREREQ(2.64)

	dnl AC_CONFIG_MACRO_DIR is deprecated as of autoconf 2.70 (2020-12-08).
	dnl Once we can require that version, we can simplify this, and no longer
	dnl need ACLOCAL_AMFLAGS in Makefile.am.
	m4_ifdef([AC_CONFIG_MACRO_DIRS],
	[AC_CONFIG_MACRO_DIRS([m4])],
	[AC_CONFIG_MACRO_DIR([m4])])

	m4_include([m4/version.m4])
	AC_INIT([pacemaker], VERSION_NUMBER, [users@clusterlabs.org], [pacemaker],
	PCMK_URL)

	LT_CONFIG_LTDL_DIR([libltdl])
	AC_CONFIG_AUX_DIR([libltdl/config])

	dnl Where #defines that autoconf makes (e.g. HAVE_whatever) go
	dnl
	dnl include/config.h
	dnl - Internal API
	dnl - Contains all defines
	dnl - include/config.h.in is generated automatically by autoheader
	dnl - Not to be included in any header files except crm_internal.h
	dnl (which is also not to be included in any other header files)
	dnl
	dnl include/crm_config.h
	dnl - External API
	dnl - Contains a subset of defines
	dnl - include/crm_config.h.in is manually edited to select the subset
	dnl - Should not include HAVE_* defines
	dnl - Safe to include anywhere
	AC_CONFIG_HEADERS([include/config.h include/crm_config.h])

	dnl 1.13: minimum automake version required
	dnl foreign: don't require GNU-standard top-level files
	dnl tar-ustar: use (older) POSIX variant of generated tar rather than v7
	dnl subdir-objects: keep .o's with their .c's (no-op in 2.0+)
	AM_INIT_AUTOMAKE([1.13 foreign tar-ustar subdir-objects])

	dnl Require minimum version of pkg-config
	PKG_PROG_PKG_CONFIG(0.28)
	AS_IF([test x"${PKG_CONFIG}" != x""], [],
	[AC_MSG_FAILURE([Could not find required build tool pkg-config (0.28 or later)])])
	PKG_INSTALLDIR
	PKG_NOARCH_INSTALLDIR


	dnl ==============================================
	dnl Compiler checks and helpers
	dnl ==============================================

	dnl A particular compiler can be forced by setting the CC environment variable
	AC_PROG_CC

	dnl C++ is needed only to run maintainer utilities, not to build
	AC_PROG_CXX

	dnl Use at least C99 if possible (automatic for autoconf >= 2.70)
	m4_version_prereq([2.70], [:], [AC_PROG_CC_STDC])

	# cc_supports_flag <compiler-flag>
	# Return success if the C compiler supports the given flag
	cc_supports_flag() {
	local CFLAGS="-Werror $@"
	AC_MSG_CHECKING([whether $CC supports $@])
	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[ ]], [[ ]])],
	[RC=0; AC_MSG_RESULT([yes])],
	[RC=1; AC_MSG_RESULT([no])])
	return $RC
	}

	# cc_temp_flags <compiler-flags>
	# Use the given flags for subsequent C compilation. These can be reverted to
	# what was used previously with cc_restore_flags. This allows certain tests to
	# use specific flags without affecting anything else.
	cc_temp_flags() {
	ac_save_CFLAGS="$CFLAGS"
	CFLAGS="$*"
	}

	# cc_restore_flags
	# Restore C compiler flags to what they were before the last cc_temp_flags
	# call.
	cc_restore_flags() {
	CFLAGS=$ac_save_CFLAGS
	}

	# Check for fatal warning support
	AS_IF([test $enable_fatal_warnings -ne $DISABLED dnl
	&& test x"$GCC" = x"yes" && cc_supports_flag -Werror],
	[WERROR="-Werror"],
	[
	WERROR=""
	AS_CASE([$enable_fatal_warnings],
	[$REQUIRED], [AC_MSG_ERROR([Compiler does not support fatal warnings])],
	[$OPTIONAL], [enable_fatal_warnings=$DISABLED])
	])


	dnl ==============================================
	dnl Linker checks
	dnl ==============================================

	# Check whether linker supports --enable-new-dtags to use RUNPATH instead of
	# RPATH. It is necessary to do this before libtool does linker detection.
	# See also: https://github.com/kronosnet/kronosnet/issues/107
	AX_CHECK_LINK_FLAG([-Wl,--enable-new-dtags],
	[AM_LDFLAGS=-Wl,--enable-new-dtags],
	[AC_MSG_ERROR(["Linker support for --enable-new-dtags is required"])])
	AC_SUBST([AM_LDFLAGS])

	saved_LDFLAGS="$LDFLAGS"
	LDFLAGS="$AM_LDFLAGS $LDFLAGS"
	LT_INIT([dlopen])
	LDFLAGS="$saved_LDFLAGS"
	LTDL_INIT([convenience])


	dnl ==============================================
	dnl Define configure options
	dnl ==============================================

	# yes_no_try <user-response> <default>
	# Map a yes/no/try user selection to $REQUIRED for yes, $DISABLED for no, and
	# $OPTIONAL for try.
	DISABLED=0
	REQUIRED=1
	OPTIONAL=2
	yes_no_try() {
	local value
	AS_IF([test x"$1" = x""], [value="$2"], [value="$1"])
	AS_CASE(["`echo "$value" \| tr '[A-Z]' '[a-z]'`"],
	[0\|no\|false\|disable], [return $DISABLED],
	[1\|yes\|true\|enable], [return $REQUIRED],
	[try\|check], [return $OPTIONAL]
	)
	AC_MSG_ERROR([Invalid option value "$value"])
	}

	#
	# Fix the defaults of certain built-in variables so they can be used in the
	# defaults for our custom arguments
	#

	AC_MSG_NOTICE([Sanitizing prefix: ${prefix}])
	AS_IF([test x"$prefix" = x"NONE"],
	[
	prefix=/usr
	dnl Fix default variables - "prefix" variable if not specified
	AS_IF([test x"$localstatedir" = x"\${prefix}/var"],
	[localstatedir="/var"])
	AS_IF([test x"$sysconfdir" = x"\${prefix}/etc"],
	[sysconfdir="/etc"])
	])

	AC_MSG_NOTICE([Sanitizing exec_prefix: ${exec_prefix}])
	AS_CASE([$exec_prefix],
	[prefix\|NONE], [exec_prefix=$prefix])

	AC_MSG_NOTICE([Sanitizing libdir: ${libdir}])
	AS_CASE([$libdir],
	[prefix\|NONE], [
	AC_MSG_CHECKING([which lib directory to use])
	for aDir in lib64 lib
	do
	trydir="${exec_prefix}/${aDir}"
	AS_IF([test -d ${trydir}],
	[
	libdir=${trydir}
	break
	])
	done
	AC_MSG_RESULT([$libdir])
	])

	# Start a list of optional features this build supports
	PCMK_FEATURES=""

	dnl This section should include only the definition of configure script
	dnl options and determining their values. Processing should be done later when
	dnl possible, other than what's needed to determine values and defaults.

	dnl Per the autoconf docs, --enable-/--disable- options should control
	dnl features inherent to Pacemaker, while --with-/--without- options should
	dnl control the use of external software. However, --enable-/--disable- may
	dnl implicitly require additional external dependencies, and
	dnl --with-/--without- may implicitly enable or disable features, so the
	dnl line is blurry.
	dnl
	dnl We also use --with-* options for custom file, directory, and path
	dnl locations, since autoconf does not provide an option type for those.

	dnl --enable-* options: build process

	AC_ARG_ENABLE([quiet],
	[AS_HELP_STRING([--enable-quiet],
	[suppress make output unless there is an error @<:@no@:>@])]
	)
	yes_no_try "$enable_quiet" "no"
	enable_quiet=$?

	AC_ARG_ENABLE([fatal-warnings],
	[AS_HELP_STRING([--enable-fatal-warnings],
	[enable pedantic and fatal warnings for gcc @<:@try@:>@])],
	)
	yes_no_try "$enable_fatal_warnings" "try"
	enable_fatal_warnings=$?

	AC_ARG_ENABLE([hardening],
	[AS_HELP_STRING([--enable-hardening],
	[harden the resulting executables/libraries @<:@try@:>@])]
	)
	yes_no_try "$enable_hardening" "try"
	enable_hardening=$?

	dnl --enable-* options: features

	AC_ARG_ENABLE([systemd],
	[AS_HELP_STRING([--enable-systemd],
	[enable support for managing resources via systemd @<:@try@:>@])]
	)
	yes_no_try "$enable_systemd" "try"
	enable_systemd=$?

	AC_ARG_ENABLE([upstart],
	[AS_HELP_STRING([--enable-upstart],
	[enable support for managing resources via Upstart (deprecated) @<:@try@:>@])]
	)
	yes_no_try "$enable_upstart" "try"
	enable_upstart=$?

	dnl --enable-* options: features inherent to Pacemaker

	# AM_GNU_GETTEXT calls AM_NLS which defines the nls option, but it defaults
	# to enabled. We override the definition of AM_NLS to flip the default and mark
	# it as experimental in the help text.
	AC_DEFUN([AM_NLS],
	[AC_MSG_CHECKING([whether NLS is requested])
	AC_ARG_ENABLE([nls],
	[AS_HELP_STRING([--enable-nls],
	[use Native Language Support (experimental)])],
	USE_NLS=$enableval, USE_NLS=no)
	AC_MSG_RESULT([$USE_NLS])
	AC_SUBST([USE_NLS])]
	)
	AM_GNU_GETTEXT([external])
	AM_GNU_GETTEXT_VERSION([0.18])

	dnl --with-* options: external software support, and custom locations

	dnl This argument is defined via an M4 macro so default can be a variable
	AC_DEFUN([VERSION_ARG],
	[AC_ARG_WITH([version],
	[AS_HELP_STRING([--with-version=VERSION],
	[override package version @<:@$1@:>@])],
	[ PACEMAKER_VERSION="$withval" ],
	[ PACEMAKER_VERSION="$PACKAGE_VERSION" ])]
	)
	VERSION_ARG(VERSION_NUMBER)

	CRM_DAEMON_USER=""
	AC_ARG_WITH([daemon-user],
	[AS_HELP_STRING([--with-daemon-user=USER],
	[user to run unprivileged Pacemaker daemons as (advanced option: changing this may break other cluster components unless similarly configured) @<:@hacluster@:>@])],
	[ CRM_DAEMON_USER="$withval" ]
	)
	AS_IF([test x"${CRM_DAEMON_USER}" = x""],
	[CRM_DAEMON_USER="hacluster"])

	CRM_DAEMON_GROUP=""
	AC_ARG_WITH([daemon-group],
	[AS_HELP_STRING([--with-daemon-group=GROUP],
	[group to run unprivileged Pacemaker daemons as (advanced option: changing this may break other cluster components unless similarly configured) @<:@haclient@:>@])],
	[ CRM_DAEMON_GROUP="$withval" ]
	)
	AS_IF([test x"${CRM_DAEMON_GROUP}" = x""],
	[CRM_DAEMON_GROUP="haclient"])

	BUG_URL=""
	AC_ARG_WITH([bug-url],
	[AS_HELP_STRING([--with-bug-url=DIR], m4_normalize([
	address where users should submit bug reports
	@<:@https://bugs.clusterlabs.org/enter_bug.cgi?product=Pacemaker@:>@]))],
	[ BUG_URL="$withval" ]
	)
	AS_IF([test x"${BUG_URL}" = x""],
	[BUG_URL="https://bugs.clusterlabs.org/enter_bug.cgi?product=Pacemaker"])

	dnl --with-* options: features

	AC_ARG_WITH([cibsecrets],
	[AS_HELP_STRING([--with-cibsecrets],
	[support separate file for CIB secrets @<:@no@:>@])]
	)
	yes_no_try "$with_cibsecrets" "no"
	with_cibsecrets=$?

	PCMK_GNUTLS_PRIORITIES="NORMAL"
	AC_ARG_WITH([gnutls-priorities],
	[AS_HELP_STRING([--with-gnutls-priorities],
	[default GnuTLS cipher priorities @<:@NORMAL@:>@])],
	[ test x"$withval" = x"no" \|\| PCMK_GNUTLS_PRIORITIES="$withval" ]
	)

	AC_ARG_WITH([concurrent-fencing-default],
	[AS_HELP_STRING([--with-concurrent-fencing-default],
	[default value for concurrent-fencing cluster option @<:@false@:>@])],
	)
	AS_CASE([$with_concurrent_fencing_default],
	[""], [with_concurrent_fencing_default="false"],
	[false], [],
	[true], [PCMK_FEATURES="$PCMK_FEATURES default-concurrent-fencing"],
	[AC_MSG_ERROR([Invalid value "$with_concurrent_fencing_default" for --with-concurrent-fencing-default])]
	)

	AC_ARG_WITH([sbd-sync-default],
	[AS_HELP_STRING([--with-sbd-sync-default], m4_normalize([
	default value used by sbd if SBD_SYNC_RESOURCE_STARTUP
	environment variable is not set @<:@false@:>@]))],
	)
	AS_CASE([$with_sbd_sync_default],
	[""], [with_sbd_sync_default=false],
	[false], [],
	[true], [PCMK_FEATURES="$PCMK_FEATURES default-sbd-sync"],
	[AC_MSG_ERROR([Invalid value "$with_sbd_sync_default" for --with-sbd-sync-default])]
	)

	AC_ARG_WITH([resource-stickiness-default],
	[AS_HELP_STRING([--with-resource-stickiness-default],
	[If positive, value to add to new CIBs as explicit resource default for resource-stickiness @<:@0@:>@])],
	)
	errmsg="Invalid value \"$with_resource_stickiness_default\" for --with-resource-stickiness-default"
	AS_CASE([$with_resource_stickiness_default],
	[0\|""], [with_resource_stickiness_default="0"],
	[[[!0-9]]], [AC_MSG_ERROR([$errmsg])],
	[PCMK_FEATURES="$PCMK_FEATURES default-resource-stickiness"]
	)

	AC_ARG_WITH([corosync],
	[AS_HELP_STRING([--with-corosync],
	[support the Corosync messaging and membership layer @<:@try@:>@])]
	)
	yes_no_try "$with_corosync" "try"
	with_corosync=$?

	dnl Get default from Corosync if possible
	PKG_CHECK_VAR([PCMK__COROSYNC_CONF], [corosync], [corosysconfdir],
	[PCMK__COROSYNC_CONF="$PCMK__COROSYNC_CONF/corosync.conf"],
	[PCMK__COROSYNC_CONF="${sysconfdir}/corosync/corosync.conf"])
	AC_ARG_WITH([corosync-conf],
	[AS_HELP_STRING([--with-corosync-conf], m4_normalize([
	location of Corosync configuration file
	@<:@value from Corosync package if available otherwise
	SYSCONFDIR/corosync/corosync.conf@:>@]))],
	[ PCMK__COROSYNC_CONF="$withval" ]
	)

	AC_ARG_WITH([nagios],
	[AS_HELP_STRING([--with-nagios], [support nagios resources (deprecated)])]
	)
	yes_no_try "$with_nagios" "try"
	with_nagios=$?

	dnl --with-* options: directory locations

	AC_ARG_WITH([nagios-plugin-dir],
	[AS_HELP_STRING([--with-nagios-plugin-dir=DIR],
	[directory for nagios plugins (deprecated) @<:@LIBEXECDIR/nagios/plugins@:>@])],
	[ NAGIOS_PLUGIN_DIR="$withval" ]
	)

	AC_ARG_WITH([nagios-metadata-dir],
	[AS_HELP_STRING([--with-nagios-metadata-dir=DIR],
	[directory for nagios plugins metadata (deprecated) @<:@DATADIR/nagios/plugins-metadata@:>@])],
	[ NAGIOS_METADATA_DIR="$withval" ]
	)

	INITDIR=""
	AC_ARG_WITH([initdir],
	[AS_HELP_STRING([--with-initdir=DIR],
	[directory for init (rc) scripts])],
	[ INITDIR="$withval" ]
	)

	systemdsystemunitdir="${systemdsystemunitdir-}"
	AC_ARG_WITH([systemdsystemunitdir],
	[AS_HELP_STRING([--with-systemdsystemunitdir=DIR],
	[directory for systemd unit files (advanced option: must match what systemd uses)])],
	[ systemdsystemunitdir="$withval" ]
	)

	CONFIGDIR=""
	AC_ARG_WITH([configdir],
	[AS_HELP_STRING([--with-configdir=DIR],
	[directory for Pacemaker configuration file @<:@SYSCONFDIR/sysconfig@:>@])],
	[ CONFIGDIR="$withval" ]
	)

	dnl --runstatedir is available as of autoconf 2.70 (2020-12-08). When users
	dnl have an older version, they can use our --with-runstatedir.
	pcmk_runstatedir=""
	AC_ARG_WITH([runstatedir],
	[AS_HELP_STRING([--with-runstatedir=DIR],
	[modifiable per-process data @<:@LOCALSTATEDIR/run@:>@ (ignored if --runstatedir is available)])],
	[ pcmk_runstatedir="$withval" ]
	)

	CRM_LOG_DIR=""
	AC_ARG_WITH([logdir],
	[AS_HELP_STRING([--with-logdir=DIR],
	[directory for Pacemaker log file @<:@LOCALSTATEDIR/log/pacemaker@:>@])],
	[ CRM_LOG_DIR="$withval" ]
	)

	CRM_BUNDLE_DIR=""
	AC_ARG_WITH([bundledir],
	[AS_HELP_STRING([--with-bundledir=DIR],
	[directory for Pacemaker bundle logs @<:@LOCALSTATEDIR/log/pacemaker/bundles@:>@])],
	[ CRM_BUNDLE_DIR="$withval" ]
	)

	dnl Get default from resource-agents if possible. Otherwise, the default uses
	dnl /usr/lib rather than libdir because it's determined by the OCF project and
	dnl not Pacemaker. Even if a user wants to install Pacemaker to /usr/local or
	dnl such, the OCF agents will be expected in their usual location. However, we
	dnl do give the user the option to override it.
	PKG_CHECK_VAR([OCF_ROOT_DIR], [resource-agents], [ocfrootdir], [],
	[OCF_ROOT_DIR="/usr/lib/ocf"])
	AC_ARG_WITH([ocfdir],
	[AS_HELP_STRING([--with-ocfdir=DIR], m4_normalize([
	OCF resource agent root directory (advanced option: changing this
	may break other cluster components unless similarly configured)
	@<:@value from resource-agents package if available otherwise
	/usr/lib/ocf@:>@]))],
	[ OCF_ROOT_DIR="$withval" ]
	)

	dnl Get default from resource-agents if possible
	PKG_CHECK_VAR([OCF_RA_PATH], [resource-agents], [ocfrapath], [],
	[OCF_RA_PATH="$OCF_ROOT_DIR/resource.d"])
	AC_ARG_WITH([ocfrapath],
	[AS_HELP_STRING([--with-ocfrapath=DIR], m4_normalize([
	OCF resource agent directories (colon-separated) to search
	@<:@value from resource-agents package if available otherwise
	OCFDIR/resource.d@:>@]))],
	[ OCF_RA_PATH="$withval" ]
	)

	OCF_RA_INSTALL_DIR="$OCF_ROOT_DIR/resource.d"
	AC_ARG_WITH([ocfrainstalldir],
	[AS_HELP_STRING([--with-ocfrainstalldir=DIR], m4_normalize([
	OCF installation directory for Pacemakers resource agents
	@<:@OCFDIR/resource.d@:>@]))],
	[ OCF_RA_INSTALL_DIR="$withval" ]
	)

	dnl Get default from fence-agents if available
	PKG_CHECK_VAR([FA_PREFIX], [fence-agents], [prefix],
	[PCMK__FENCE_BINDIR="${FA_PREFIX}/sbin"],
	[PCMK__FENCE_BINDIR="$sbindir"])
	AC_ARG_WITH([fence-bindir],
	[AS_HELP_STRING([--with-fence-bindir=DIR], m4_normalize([
	directory for executable fence agents @<:@value from fence-agents
	package if available otherwise SBINDIR@:>@]))],
	[ PCMK__FENCE_BINDIR="$withval" ]
	)

	dnl --with-* options: non-production testing

	AC_ARG_WITH([profiling],
	[AS_HELP_STRING([--with-profiling],
	[disable optimizations, for effective profiling @<:@no@:>@])]
	)
	yes_no_try "$with_profiling" "no"
	with_profiling=$?

	AC_ARG_WITH([coverage],
	[AS_HELP_STRING([--with-coverage],
	[disable optimizations, for effective profiling and coverage testing @<:@no@:>@])]
	)
	yes_no_try "$with_coverage" "no"
	with_coverage=$?

	AC_DEFINE_UNQUOTED([PCMK__WITH_COVERAGE], [$with_coverage], [Build with code coverage])
	AM_CONDITIONAL([BUILD_COVERAGE], [test $with_coverage -ne $DISABLED])

	AC_ARG_WITH([sanitizers],
	[AS_HELP_STRING([--with-sanitizers=...,...],
	[enable SANitizer build, do NOT use for production. Only ASAN/UBSAN/TSAN are currently supported])],
	[ SANITIZERS="$withval" ],
	[ SANITIZERS="" ])

	dnl Environment variable options

	AC_ARG_VAR([CFLAGS_HARDENED_LIB], [extra C compiler flags for hardened libraries])
	AC_ARG_VAR([LDFLAGS_HARDENED_LIB], [extra linker flags for hardened libraries])

	AC_ARG_VAR([CFLAGS_HARDENED_EXE], [extra C compiler flags for hardened executables])
	AC_ARG_VAR([LDFLAGS_HARDENED_EXE], [extra linker flags for hardened executables])


	dnl ==============================================
	dnl Locate essential tools
	dnl ==============================================

	PATH="$PATH:/sbin:/usr/sbin:/usr/local/sbin:/usr/local/bin"
	export PATH

	dnl Pacemaker's executable python scripts will invoke the python specified by
	dnl configure's PYTHON variable. If not specified, AM_PATH_PYTHON will check a
	dnl built-in list with (unversioned) "python" having precedence. To configure
	dnl Pacemaker to use a specific python interpreter version, define PYTHON
	dnl when calling configure, for example: ./configure PYTHON=/usr/bin/python3.6

	dnl If PYTHON was specified, ensure it is an absolute path
	AS_IF([test x"${PYTHON}" != x""], [AC_PATH_PROG([PYTHON], [$PYTHON])])

	dnl Require a minimum Python version
	AM_PATH_PYTHON([3.6])

	AC_PROG_LN_S
	AC_PROG_MKDIR_P

	AC_PATH_PROG([GIT], [git], [false])

	dnl Bash is needed for building man pages and running regression tests.
	dnl We set "BASH_PATH" because "BASH" is already an environment variable.
	REQUIRE_PROG([BASH_PATH], [bash])

	AC_PATH_PROGS(VALGRIND_BIN, valgrind, /usr/bin/valgrind)
	AC_DEFINE_UNQUOTED(VALGRIND_BIN, "$VALGRIND_BIN", Valgrind command)


	dnl ==============================================
	dnl Package and schema versioning
	dnl ==============================================

	# Redefine PACKAGE_VERSION and VERSION according to PACEMAKER_VERSION in case
	# the user used --with-version. Unfortunately, this can only affect the
	# substitution variables and later uses in this file, not the config.h
	# constants, so we have to be careful to use only PACEMAKER_VERSION in C code.
	PACKAGE_VERSION=$PACEMAKER_VERSION
	VERSION=$PACEMAKER_VERSION

	AC_DEFINE_UNQUOTED(PACEMAKER_VERSION, "$VERSION",
	[Version number of this Pacemaker build])

	AC_MSG_CHECKING([build version])
	AS_IF([test "$GIT" != "false" && test -d .git],
	[
	BUILD_VERSION=`"$GIT" log --pretty="format:%h" -n 1`
	AC_MSG_RESULT([$BUILD_VERSION (git hash)])
	],
	[
	# The current directory name make a reasonable default
	# Most generated archives will include the hash or tag
	BASE=`basename $PWD`
	BUILD_VERSION=`echo $BASE \| sed s:.*[[Pp]]acemaker-::`
	AC_MSG_RESULT([$BUILD_VERSION (directory name)])
	])
	AC_DEFINE_UNQUOTED(BUILD_VERSION, "$BUILD_VERSION", Build version)
	AC_SUBST(BUILD_VERSION)

	# schema_files <schema-dir>
	# List all manually edited RNG schemas (as opposed to auto-generated via make)
	# in the given directory. Use git if available to list managed RNGs, in case
	# there are leftover schema files from an earlier build of a different
	# version. Otherwise, check all RNGs.
	schema_files() {
	local files="$("$GIT" ls-files "$1"/*.rng 2>/dev/null)"

	AS_IF([test x"$files" = x""],
	[
	files="$(ls -1 "$1"/*.rng \| grep -E -v \
	'/(pacemaker\|api-result\|crm_mon\|versions)[^/]*\.rng')"
	])
	echo "$files"
	}

	# latest_schema_version <schema-dir>
	# Determine highest RNG version in the given schema directory.
	latest_schema_version() {
	schema_files "$1" \| sed -n -e 's/^.-$[[0-9]][[0-9.]]$.rng$/\1/p' dnl
	\| sort -V \| tail -1
	}

	# schemas_for_make <schema-dir>
	# Like schema_files, but suitable for use in make variables.
	schemas_for_make() {
	local file

	for file in $(schema_files "$1"); do
	AS_ECHO_N(["\$(top_srcdir)/$file "])
	done
	}

	# Detect highest API schema version
	API_VERSION=$(latest_schema_version "xml/api")
	AC_DEFINE_UNQUOTED([PCMK__API_VERSION], ["$API_VERSION"],
	[Highest API schema version])

	# Detect highest CIB schema version
	CIB_VERSION=$(latest_schema_version "xml")
	AC_SUBST(CIB_VERSION)

	# Re-run configure at next make if schema files change, to re-detect versions
	cib_schemas="$(schemas_for_make "xml")"
	api_schemas="$(schemas_for_make "xml/api")"
	CONFIG_STATUS_DEPENDENCIES="$cib_schemas $api_schemas"
	AC_SUBST(CONFIG_STATUS_DEPENDENCIES)


	dnl ==============================================
	dnl Process simple options
	dnl ==============================================

	AS_IF([test x"$enable_nls" = x"yes"], [PCMK_FEATURES="$PCMK_FEATURES nls"])

	AC_DEFINE_UNQUOTED([PCMK__CONCURRENT_FENCING_DEFAULT],
	["$with_concurrent_fencing_default"],
	[Default value for concurrent-fencing cluster option])

	AC_DEFINE_UNQUOTED([PCMK__SBD_SYNC_DEFAULT],
	[$with_sbd_sync_default],
	[Default value for SBD_SYNC_RESOURCE_STARTUP environment variable])

	AC_DEFINE_UNQUOTED([PCMK__RESOURCE_STICKINESS_DEFAULT],
	[$with_resource_stickiness_default],
	[Default value for resource-stickiness resource meta-attribute])

	AS_IF([test x"${PCMK_GNUTLS_PRIORITIES}" != x""], [],
	[AC_MSG_ERROR([--with-gnutls-priorities value must not be empty])])
	AC_DEFINE_UNQUOTED([PCMK_GNUTLS_PRIORITIES], ["$PCMK_GNUTLS_PRIORITIES"],
	[GnuTLS cipher priorities])
	AC_SUBST(PCMK_GNUTLS_PRIORITIES)

	AC_SUBST(BUG_URL)
	AC_DEFINE_UNQUOTED([PCMK__BUG_URL], ["$BUG_URL"],
	[Where bugs should be reported])

	AC_DEFINE_UNQUOTED([CRM_DAEMON_USER], ["$CRM_DAEMON_USER"],
	[User to run Pacemaker daemons as])
	AC_SUBST(CRM_DAEMON_USER)

	AC_DEFINE_UNQUOTED([CRM_DAEMON_GROUP], ["$CRM_DAEMON_GROUP"],
	[Group to run Pacemaker daemons as])
	AC_SUBST(CRM_DAEMON_GROUP)


	dnl ==============================================
	dnl Process file paths
	dnl ==============================================

	# expand_path_option <path-variable-name> [<default>]
	# Given the name of a file path variable, expand any variable references
	# inside it, use the specified default if it is not specified, and ensure it
	# is a full path.
	expand_path_option() {
	# The first argument is the variable name (not value)
	ac_path_varname="$1"

	# Get the original value of the variable
	ac_path_value=$(eval echo "\${${ac_path_varname}}")

	# Expand any literal variable expressions in the value so that we don't
	# end up with something like '${prefix}' in #defines etc.
	#
	# Autoconf deliberately leaves values unexpanded to allow overriding
	# the configure script choices in make commands (for example,
	# "make exec_prefix=/foo install"). No longer being able to do this seems
	# like no great loss.
	eval ac_path_value=$(eval echo "${ac_path_value}")

	# Use (expanded) default if necessary
	AS_IF([test x"${ac_path_value}" = x""],
	[eval ac_path_value=$(eval echo "$2")])

	# Require a full path
	AS_CASE(["$ac_path_value"],
	[/*], [eval ${ac_path_varname}="$ac_path_value"],
	[*], [AC_MSG_ERROR([$ac_path_varname value "$ac_path_value" is not a full path])]
	)
	}

	AC_MSG_NOTICE([Sanitizing INITDIR: ${INITDIR}])
	AS_CASE([$INITDIR],
	[prefix], [INITDIR=$prefix],
	[""], [
	AC_MSG_CHECKING([which init (rc) directory to use])
	for initdir in /etc/init.d /etc/rc.d/init.d /sbin/init.d \
	/usr/local/etc/rc.d /etc/rc.d
	do
	AS_IF([test -d $initdir],
	[
	INITDIR=$initdir
	break
	])
	done
	AC_MSG_RESULT([$INITDIR])
	])
	AC_SUBST(INITDIR)

	dnl Expand values of autoconf-provided directory options
	expand_path_option prefix
	expand_path_option exec_prefix
	expand_path_option bindir
	expand_path_option sbindir
	expand_path_option libexecdir
	expand_path_option datarootdir
	expand_path_option datadir
	expand_path_option sysconfdir
	expand_path_option sharedstatedir
	expand_path_option localstatedir
	expand_path_option libdir
	expand_path_option includedir
	expand_path_option oldincludedir
	expand_path_option infodir
	expand_path_option mandir

	AC_DEFUN([AC_DATAROOTDIR_CHECKED])

	dnl Expand values of custom directory options

	expand_path_option localedir "${datadir}/locale"
	AC_DEFINE_UNQUOTED([PCMK__LOCALE_DIR],["$localedir"],
	[Base directory for message catalogs])

	AS_IF([test x"${runstatedir}" = x""], [runstatedir="${pcmk_runstatedir}"])
	expand_path_option runstatedir "${localstatedir}/run"
	AC_DEFINE_UNQUOTED([PCMK_RUN_DIR], ["$runstatedir"],
	[Location for modifiable per-process data])
	AC_SUBST(runstatedir)

	expand_path_option INITDIR
	AC_DEFINE_UNQUOTED([PCMK__LSB_INIT_DIR], ["$INITDIR"],
	[Location for LSB init scripts])

	expand_path_option docdir "${datadir}/doc/${PACKAGE}-${VERSION}"
	AC_SUBST(docdir)

	expand_path_option CONFIGDIR "${sysconfdir}/sysconfig"
	AC_SUBST(CONFIGDIR)

	expand_path_option PCMK__COROSYNC_CONF "${sysconfdir}/corosync/corosync.conf"
	AC_SUBST(PCMK__COROSYNC_CONF)

	expand_path_option CRM_LOG_DIR "${localstatedir}/log/pacemaker"
	AC_DEFINE_UNQUOTED([CRM_LOG_DIR], ["$CRM_LOG_DIR"],
	[Location for Pacemaker log file])
	AC_SUBST(CRM_LOG_DIR)

	expand_path_option CRM_BUNDLE_DIR "${localstatedir}/log/pacemaker/bundles"
	AC_DEFINE_UNQUOTED([CRM_BUNDLE_DIR], ["$CRM_BUNDLE_DIR"],
	[Location for Pacemaker bundle logs])
	AC_SUBST(CRM_BUNDLE_DIR)

	expand_path_option PCMK__FENCE_BINDIR
	AC_SUBST(PCMK__FENCE_BINDIR)
	AC_DEFINE_UNQUOTED([PCMK__FENCE_BINDIR], ["$PCMK__FENCE_BINDIR"],
	[Location for executable fence agents])

	expand_path_option OCF_ROOT_DIR
	AC_SUBST(OCF_ROOT_DIR)
	AC_DEFINE_UNQUOTED([OCF_ROOT_DIR], ["$OCF_ROOT_DIR"],
	[OCF root directory for resource agents and libraries])

	expand_path_option OCF_RA_PATH
	AC_SUBST(OCF_RA_PATH)
	AC_DEFINE_UNQUOTED([OCF_RA_PATH], ["$OCF_RA_PATH"],
	[OCF directories to search for resource agents ])

	expand_path_option OCF_RA_INSTALL_DIR
	AC_SUBST(OCF_RA_INSTALL_DIR)

	# Derived paths

	CRM_SCHEMA_DIRECTORY="${datadir}/pacemaker"
	AC_DEFINE_UNQUOTED([CRM_SCHEMA_DIRECTORY], ["$CRM_SCHEMA_DIRECTORY"],
	[Location for the Pacemaker Relax-NG Schema])
	AC_SUBST(CRM_SCHEMA_DIRECTORY)

	PCMK__REMOTE_SCHEMA_DIR="${localstatedir}/lib/pacemaker/schemas"
	AC_DEFINE_UNQUOTED([PCMK__REMOTE_SCHEMA_DIR], ["$PCMK__REMOTE_SCHEMA_DIR"],
	[Location to store Relax-NG Schema files on remote nodes])
	AC_SUBST(PCMK__REMOTE_SCHEMA_DIR)

	CRM_CORE_DIR="${localstatedir}/lib/pacemaker/cores"
	AC_DEFINE_UNQUOTED([CRM_CORE_DIR], ["$CRM_CORE_DIR"],
	[Directory Pacemaker daemons should change to (without systemd, core files will go here)])
	AC_SUBST(CRM_CORE_DIR)

	CRM_PACEMAKER_DIR="${localstatedir}/lib/pacemaker"
	AC_DEFINE_UNQUOTED([CRM_PACEMAKER_DIR], ["$CRM_PACEMAKER_DIR"],
	[Location to store directory produced by Pacemaker daemons])
	AC_SUBST(CRM_PACEMAKER_DIR)

	CRM_BLACKBOX_DIR="${localstatedir}/lib/pacemaker/blackbox"
	AC_DEFINE_UNQUOTED([CRM_BLACKBOX_DIR], ["$CRM_BLACKBOX_DIR"],
	[Where to keep blackbox dumps])
	AC_SUBST(CRM_BLACKBOX_DIR)

	PE_STATE_DIR="${localstatedir}/lib/pacemaker/pengine"
	AC_DEFINE_UNQUOTED([PE_STATE_DIR], ["$PE_STATE_DIR"],
	[Where to keep scheduler outputs])
	AC_SUBST(PE_STATE_DIR)

	CRM_CONFIG_DIR="${localstatedir}/lib/pacemaker/cib"
	AC_DEFINE_UNQUOTED([CRM_CONFIG_DIR], ["$CRM_CONFIG_DIR"],
	[Where to keep configuration files])
	AC_SUBST(CRM_CONFIG_DIR)

	CRM_DAEMON_DIR="${libexecdir}/pacemaker"
	AC_DEFINE_UNQUOTED([CRM_DAEMON_DIR], ["$CRM_DAEMON_DIR"],
	[Location for Pacemaker daemons])
	AC_SUBST(CRM_DAEMON_DIR)

	CRM_STATE_DIR="${runstatedir}/crm"
	AC_DEFINE_UNQUOTED([CRM_STATE_DIR], ["$CRM_STATE_DIR"],
	[Where to keep state files and sockets])
	AC_SUBST(CRM_STATE_DIR)

	CRM_RSCTMP_DIR="${runstatedir}/resource-agents"
	AC_DEFINE_UNQUOTED([CRM_RSCTMP_DIR], ["$CRM_RSCTMP_DIR"],
	[Where resource agents should keep state files])
	AC_SUBST(CRM_RSCTMP_DIR)

	PACEMAKER_CONFIG_DIR="${sysconfdir}/pacemaker"
	AC_DEFINE_UNQUOTED([PACEMAKER_CONFIG_DIR], ["$PACEMAKER_CONFIG_DIR"],
	[Where to keep configuration files like authkey])
	AC_SUBST(PACEMAKER_CONFIG_DIR)

	AC_DEFINE_UNQUOTED([SBIN_DIR], ["$sbindir"], [Location for system binaries])

	# Warn about any directories that don't exist (which may be OK)
	for j in prefix exec_prefix bindir sbindir libexecdir datadir sysconfdir \
	sharedstatedir localstatedir libdir includedir oldincludedir infodir \
	mandir INITDIR docdir CONFIGDIR localedir
	do
	dirname=`eval echo '${'${j}'}'`
	AS_IF([test ! -d "$dirname"],
	[AC_MSG_WARN([$j directory ($dirname) does not exist (yet)])])
	done

	dnl ===============================================
	dnl General Processing
	dnl ===============================================

	us_auth=
	AC_CHECK_HEADER([sys/socket.h], [
	AC_CHECK_DECL([SO_PEERCRED], [
	# Linux
	AC_CHECK_TYPE([struct ucred], [
	us_auth=peercred_ucred;
	AC_DEFINE([HAVE_UCRED], [1],
	[Define if Unix socket auth method is
	getsockopt(s, SO_PEERCRED, &ucred, ...)])
	], [
	# OpenBSD
	AC_CHECK_TYPE([struct sockpeercred], [
	us_auth=localpeercred_sockepeercred;
	AC_DEFINE([HAVE_SOCKPEERCRED], [1],
	[Define if Unix socket auth method is
	getsockopt(s, SO_PEERCRED, &sockpeercred, ...)])
	], [], [[#include <sys/socket.h>]])
	], [[#define _GNU_SOURCE
	#include <sys/socket.h>]])
	], [], [[#include <sys/socket.h>]])
	])

	AS_IF([test -z "${us_auth}"], [
	# FreeBSD
	AC_CHECK_DECL([getpeereid], [
	us_auth=getpeereid;
	AC_DEFINE([HAVE_GETPEEREID], [1],
	[Define if Unix socket auth method is
	getpeereid(s, &uid, &gid)])
	], [
	# Solaris/OpenIndiana
	AC_CHECK_DECL([getpeerucred], [
	us_auth=getpeerucred;
	AC_DEFINE([HAVE_GETPEERUCRED], [1],
	[Define if Unix socket auth method is
	getpeercred(s, &ucred)])
	], [
	AC_MSG_FAILURE([No way to authenticate a Unix socket peer])
	], [[#include <ucred.h>]])
	])
	])

	dnl OS-based decision-making is poor autotools practice; feature-based
	dnl mechanisms are strongly preferred. Keep this section to a bare minimum;
	dnl regard as a "necessary evil".

	dnl Set host_os and host_cpu
	AC_CANONICAL_HOST

	INIT_EXT=""
	PROCFS=0
	dnl Solaris and some *BSD versions support procfs but not files we need
	AS_CASE(["$host_os"],
	[bsd], [INIT_EXT=".sh"],
	[linux], [PROCFS=1],
	[darwin*], [
	LIBS="$LIBS -L${prefix}/lib"
	CFLAGS="$CFLAGS -I${prefix}/include"
	])

	AC_SUBST(INIT_EXT)
	AM_CONDITIONAL([SUPPORT_PROCFS], [test $PROCFS -eq 1])
	AC_DEFINE_UNQUOTED([HAVE_LINUX_PROCFS], [$PROCFS],
	[Define to 1 if procfs is supported])

	AS_CASE(["$host_cpu"],
	[ppc64\|powerpc64], [
	AS_CASE([$CFLAGS],
	[powerpc64], [],
	[*], [AS_IF([test x"$GCC" = x"yes"], [CFLAGS="$CFLAGS -m64"])
	])
	])


	dnl ==============================================
	dnl Documentation build dependencies and checks
	dnl ==============================================

	AC_PATH_PROGS([ASCIIDOC_CONV], [asciidoc asciidoctor])
	AC_PATH_PROG([HELP2MAN], [help2man])
	AC_PATH_PROG([SPHINX], [sphinx-build])
	AC_PATH_PROG([INKSCAPE], [inkscape])
	AC_PATH_PROG([XSLTPROC], [xsltproc])
	AC_PATH_PROG([XMLCATALOG], [xmlcatalog])

	AM_CONDITIONAL(BUILD_HELP, test x"${HELP2MAN}" != x"")
	AS_IF([test x"${HELP2MAN}" != x""],
	[PCMK_FEATURES="$PCMK_FEATURES generated-manpages"])

	MANPAGE_XSLT=""
	AS_IF([test x"${XSLTPROC}" != x""],
	[
	AC_MSG_CHECKING([for DocBook-to-manpage transform])
	# first try to figure out correct template using xmlcatalog query,
	# resort to extensive (semi-deterministic) file search if that fails
	DOCBOOK_XSL_URI='http://docbook.sourceforge.net/release/xsl/current'
	DOCBOOK_XSL_PATH='manpages/docbook.xsl'
	MANPAGE_XSLT=$(${XMLCATALOG} "" ${DOCBOOK_XSL_URI}/${DOCBOOK_XSL_PATH} \
	\| sed -n 's\|^file://\|\|p;q')
	AS_IF([test x"${MANPAGE_XSLT}" = x""],
	[
	DIRS=$(find "${datadir}" -name $(basename $(dirname ${DOCBOOK_XSL_PATH})) \
	-type d 2>/dev/null \| LC_ALL=C sort)
	XSLT=$(basename ${DOCBOOK_XSL_PATH})
	for d in ${DIRS}
	do
	AS_IF([test -f "${d}/${XSLT}"],
	[
	MANPAGE_XSLT="${d}/${XSLT}"
	break
	])
	done
	])
	])
	AC_MSG_RESULT([$MANPAGE_XSLT])
	AC_SUBST(MANPAGE_XSLT)

	AM_CONDITIONAL(BUILD_XML_HELP, test x"${MANPAGE_XSLT}" != x"")
	AS_IF([test x"${MANPAGE_XSLT}" != x""],
	[PCMK_FEATURES="$PCMK_FEATURES agent-manpages"])

	AM_CONDITIONAL([IS_ASCIIDOC], [echo "${ASCIIDOC_CONV}" \| grep -Eq 'asciidoc$'])
	AM_CONDITIONAL([BUILD_ASCIIDOC], [test "x${ASCIIDOC_CONV}" != x])
	AS_IF([test x"${ASCIIDOC_CONV}" != x""],
	[PCMK_FEATURES="$PCMK_FEATURES ascii-docs"])

	AM_CONDITIONAL([BUILD_SPHINX_DOCS],
	[test x"${SPHINX}" != x"" && test x"${INKSCAPE}" != x""])
	AM_COND_IF([BUILD_SPHINX_DOCS], [PCMK_FEATURES="$PCMK_FEATURES books"])

	dnl Pacemaker's shell scripts (and thus man page builders) rely on GNU getopt
	AC_MSG_CHECKING([for GNU-compatible getopt])
	IFS_orig=$IFS
	IFS=:
	for PATH_DIR in $PATH
	do
	IFS=$IFS_orig
	GETOPT_PATH="${PATH_DIR}/getopt"
	AS_IF([test -f "$GETOPT_PATH" && test -x "$GETOPT_PATH"],
	[
	$GETOPT_PATH -T >/dev/null 2>/dev/null
	AS_IF([test $? -eq 4], [break])
	])
	GETOPT_PATH=""
	done
	IFS=$IFS_orig
	AS_IF([test -n "$GETOPT_PATH"], [AC_MSG_RESULT([$GETOPT_PATH])],
	[
	AC_MSG_RESULT([no])
	AC_MSG_ERROR([Could not find required build tool GNU-compatible getopt])
	])
	AC_SUBST([GETOPT_PATH])


	dnl ===============================================
	dnl Libraries
	dnl ===============================================
	AC_CHECK_LIB(socket, socket) dnl -lsocket
	AC_CHECK_LIB(c, dlopen) dnl if dlopen is in libc...
	AC_CHECK_LIB(dl, dlopen) dnl -ldl (for Linux)
	AC_CHECK_LIB(rt, sched_getscheduler) dnl -lrt (for Tru64)
	AC_CHECK_LIB(gnugetopt, getopt_long) dnl -lgnugetopt ( if available )
	AC_CHECK_LIB(pam, pam_start) dnl -lpam (if available)

	PKG_CHECK_MODULES([UUID], [uuid],
	[CPPFLAGS="${CPPFLAGS} ${UUID_CFLAGS}"
	LIBS="${LIBS} ${UUID_LIBS}"])

	AC_CHECK_FUNCS([sched_setscheduler])
	AS_IF([test x"$ac_cv_func_sched_setscheduler" != x"yes"],
	[PC_LIBS_RT=""],
	[PC_LIBS_RT="-lrt"])
	AC_SUBST(PC_LIBS_RT)

	# Require minimum glib version
	PKG_CHECK_MODULES([GLIB], [glib-2.0 >= 2.42.0],
	[CPPFLAGS="${CPPFLAGS} ${GLIB_CFLAGS}"
	LIBS="${LIBS} ${GLIB_LIBS}"])

	# Check whether high-resolution sleep function is available
	AC_CHECK_FUNCS([nanosleep usleep])

	#
	# Where is dlopen?
	#
	AS_IF([test x"$ac_cv_lib_c_dlopen" = x"yes"],
	[LIBADD_DL=""],
	[test x"$ac_cv_lib_dl_dlopen" = x"yes"],
	[LIBADD_DL=-ldl],
	[LIBADD_DL=${lt_cv_dlopen_libs}])

	PKG_CHECK_MODULES(LIBXML2, [libxml-2.0 >= 2.9.2],
	[CPPFLAGS="${CPPFLAGS} ${LIBXML2_CFLAGS}"
	LIBS="${LIBS} ${LIBXML2_LIBS}"])

	REQUIRE_LIB([xslt], [xsltApplyStylesheet])

	AC_MSG_CHECKING([whether __progname and __progname_full are available])
	AC_LINK_IFELSE([AC_LANG_PROGRAM([[extern char __progname, __progname_full;]],
	[[__progname = "foo";
	__progname_full = "foo bar";]])],
	[
	have_progname="yes"
	AC_DEFINE(HAVE_PROGNAME, 1,
	[Define to 1 if processes can change their name])
	],
	[have_progname="no"])
	AC_MSG_RESULT([$have_progname])

	dnl ========================================================================
	dnl Headers
	dnl ========================================================================

	# Some distributions insert #warnings into deprecated headers. If we will
	# enable fatal warnings for the build, then enable them for the header checks
	# as well, otherwise the build could fail even though the header check
	# succeeds. (We should probably be doing this in more places.)
	cc_temp_flags "$CFLAGS $WERROR"

	# Optional headers (inclusion of these should be conditional in C code)
	AC_CHECK_HEADERS([linux/swab.h])
	AC_CHECK_HEADERS([stddef.h])
	AC_CHECK_HEADERS([sys/signalfd.h])
	AC_CHECK_HEADERS([uuid/uuid.h])
	AC_CHECK_HEADERS([security/pam_appl.h pam/pam_appl.h])

	# Required headers
	REQUIRE_HEADER([arpa/inet.h])
	REQUIRE_HEADER([ctype.h])
	REQUIRE_HEADER([dirent.h])
	REQUIRE_HEADER([dlfcn.h])
	REQUIRE_HEADER([errno.h])
	REQUIRE_HEADER([fcntl.h])
	REQUIRE_HEADER([float.h])
	REQUIRE_HEADER([glib.h])
	REQUIRE_HEADER([grp.h])
	REQUIRE_HEADER([inttypes.h])
	REQUIRE_HEADER([libgen.h])
	REQUIRE_HEADER([limits.h])
	REQUIRE_HEADER([locale.h])
	REQUIRE_HEADER([netdb.h])
	REQUIRE_HEADER([netinet/in.h])
	REQUIRE_HEADER([netinet/ip.h], [
	#include <sys/types.h>
	#include <netinet/in.h>
	])
	REQUIRE_HEADER([netinet/tcp.h])
	REQUIRE_HEADER([pwd.h])
	REQUIRE_HEADER([regex.h])
	REQUIRE_HEADER([sched.h])
	REQUIRE_HEADER([signal.h])
	REQUIRE_HEADER([stdarg.h])
	REQUIRE_HEADER([stdbool.h])
	REQUIRE_HEADER([stdint.h])
	REQUIRE_HEADER([stdio.h])
	REQUIRE_HEADER([stdlib.h])
	REQUIRE_HEADER([string.h])
	REQUIRE_HEADER([strings.h])
	REQUIRE_HEADER([sys/ioctl.h])
	REQUIRE_HEADER([sys/param.h])
	REQUIRE_HEADER([sys/reboot.h])
	REQUIRE_HEADER([sys/resource.h])
	REQUIRE_HEADER([sys/socket.h])
	REQUIRE_HEADER([sys/stat.h])
	REQUIRE_HEADER([sys/time.h])
	REQUIRE_HEADER([sys/types.h])
	REQUIRE_HEADER([sys/uio.h])
	REQUIRE_HEADER([sys/utsname.h])
	REQUIRE_HEADER([sys/wait.h])
	REQUIRE_HEADER([termios.h])
	REQUIRE_HEADER([time.h])
	REQUIRE_HEADER([unistd.h])
	REQUIRE_HEADER([libxml/xpath.h])
	REQUIRE_HEADER([libxslt/xslt.h])

	cc_restore_flags

	dnl ========================================================================
	dnl Generic declarations
	dnl ========================================================================

	AC_CHECK_DECLS([CLOCK_MONOTONIC], [PCMK_FEATURES="$PCMK_FEATURES monotonic"], [], [[
	#include <time.h>
	]])

	dnl ========================================================================
	dnl Unit test declarations
	dnl ========================================================================

	AC_CHECK_DECLS([assert_float_equal], [], [], [[
	#include <stdarg.h>
	#include <stddef.h>
	#include <setjmp.h>
	#include <cmocka.h>
	]])

	dnl ========================================================================
	dnl Byte size
	dnl ========================================================================

	# Compile-time assert hack
	# https://jonjagger.blogspot.com/2017/07/compile-time-assertions-in-c.html
	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <limits.h>]],
	[[
	switch (0) {
	case 0:
	case (CHAR_BIT == 8):
	break;
	}
	]])],
	[],
	[AC_MSG_FAILURE(m4_normalize([Pacemaker is not supported on
	platforms where char is not 8
	bits]))])

	dnl ========================================================================
	dnl Structures
	dnl ========================================================================

	AC_CHECK_MEMBERS([struct tm.tm_gmtoff],,,[[#include <time.h>]])
	AC_CHECK_MEMBER([struct dirent.d_type],
	AC_DEFINE(HAVE_STRUCT_DIRENT_D_TYPE,1,[Define this if struct dirent has d_type]),,
	[#include <dirent.h>])

	dnl ========================================================================
	dnl Functions
	dnl ========================================================================

	REQUIRE_FUNC([alphasort])
	REQUIRE_FUNC([getopt])
	REQUIRE_FUNC([scandir])
	REQUIRE_FUNC([setenv])
	REQUIRE_FUNC([strndup])
	REQUIRE_FUNC([strnlen])
	REQUIRE_FUNC([unsetenv])
	REQUIRE_FUNC([uuid_unparse])
	REQUIRE_FUNC([vasprintf])

	AC_CHECK_FUNCS([strchrnul])

	AC_CHECK_FUNCS([fopen64])
	AM_CONDITIONAL([WRAPPABLE_FOPEN64], [test x"$ac_cv_func_fopen64" = x"yes"])

	AC_MSG_CHECKING([whether strerror always returns non-NULL])
	AC_RUN_IFELSE([AC_LANG_PROGRAM([[
	#include <stdio.h>
	#include <string.h>
	]], [[
	return strerror(-1) == NULL;
	]])],
	[AC_MSG_RESULT([yes])],
	[AC_MSG_ERROR([strerror() is not C99-compliant])],
	[AC_MSG_ERROR([strerror() is not C99-compliant])])

	AC_RUN_IFELSE([AC_LANG_PROGRAM([[#include <stdio.h>]], [[
	const char *s = "some-command-line-arg";
	char *name = NULL;
	int n = sscanf(s, "%ms", &name);
	return n != 1;
	]])],
	[have_sscanf_m="yes"],
	[have_sscanf_m="no"],
	[have_sscanf_m="no"])
	AS_IF([test x"$have_sscanf_m" = x"yes"],
	[AC_DEFINE([HAVE_SSCANF_M], [1],
	[Define to 1 if sscanf %m modifier is available])])

	dnl ========================================================================
	dnl bzip2
	dnl ========================================================================
	REQUIRE_HEADER([bzlib.h])
	REQUIRE_LIB([bz2], [BZ2_bzBuffToBuffCompress])

	dnl ========================================================================
	dnl sighandler_t is missing from Illumos, Solaris11 systems
	dnl ========================================================================

	AC_MSG_CHECKING([for sighandler_t])
	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <signal.h>]], [[sighandler_t *f;]])],
	[
	AC_MSG_RESULT([yes])
	AC_DEFINE([HAVE_SIGHANDLER_T], [1],
	[Define to 1 if sighandler_t is available])
	],
	[AC_MSG_RESULT([no])])

	dnl ========================================================================
	dnl ncurses
	dnl ========================================================================
	dnl
	dnl A few OSes (e.g. Linux) deliver a default "ncurses" alongside "curses".
	dnl Many non-Linux deliver "curses"; sites may add "ncurses".
	dnl
	dnl However, the source-code recommendation for both is to #include "curses.h"
	dnl (i.e. "ncurses" still wants the include to be simple, no-'n', "curses.h").
	dnl
	dnl ncurses takes precedence.
	dnl
	AC_CHECK_HEADERS([curses.h curses/curses.h ncurses.h ncurses/ncurses.h])

	dnl Although n-library is preferred, only look for it if the n-header was found.
	CURSESLIBS=''
	PC_NAME_CURSES=""
	PC_LIBS_CURSES=""
	AS_IF([test x"$ac_cv_header_ncurses_h" = x"yes"], [
	AC_CHECK_LIB(ncurses, printw,
	[AC_DEFINE(HAVE_LIBNCURSES,1, have ncurses library)])
	CURSESLIBS=`$PKG_CONFIG --libs ncurses` \|\| CURSESLIBS='-lncurses'
	PC_NAME_CURSES="ncurses"
	])

	AS_IF([test x"$ac_cv_header_ncurses_ncurses_h" = x"yes"], [
	AC_CHECK_LIB(ncurses, printw,
	[AC_DEFINE(HAVE_LIBNCURSES,1, have ncurses library)])
	CURSESLIBS=`$PKG_CONFIG --libs ncurses` \|\| CURSESLIBS='-lncurses'
	PC_NAME_CURSES="ncurses"
	])

	dnl Only look for non-n-library if there was no n-library.
	AS_IF([test x"$CURSESLIBS" = x"" && test x"$ac_cv_header_curses_h" = x"yes"], [
	AC_CHECK_LIB(curses, printw,
	[CURSESLIBS='-lcurses'; AC_DEFINE(HAVE_LIBCURSES,1, have curses library)])
	PC_LIBS_CURSES="$CURSESLIBS"
	])

	dnl Only look for non-n-library if there was no n-library.
	AS_IF([test x"$CURSESLIBS" = x"" && test x"$ac_cv_header_curses_curses_h" = x"yes"], [
	AC_CHECK_LIB(curses, printw,
	[CURSESLIBS='-lcurses'; AC_DEFINE(HAVE_LIBCURSES,1, have curses library)])
	PC_LIBS_CURSES="$CURSESLIBS"
	])

	AS_IF([test x"$CURSESLIBS" != x""],
	[PCMK_FEATURES="$PCMK_FEATURES ncurses"])

	dnl Check for printw() prototype compatibility
	AS_IF([test x"$CURSESLIBS" != x"" && cc_supports_flag -Wcast-qual], [
	ac_save_LIBS=$LIBS
	LIBS="$CURSESLIBS"

	# avoid broken test because of hardened build environment in Fedora 23+
	# - https://fedoraproject.org/wiki/Changes/Harden_All_Packages
	# - https://bugzilla.redhat.com/1297985
	AS_IF([cc_supports_flag -fPIC],
	[cc_temp_flags "-Wcast-qual $WERROR -fPIC"],
	[cc_temp_flags "-Wcast-qual $WERROR"])

	AC_MSG_CHECKING([whether curses library is compatible])
	AC_LINK_IFELSE(
	[AC_LANG_PROGRAM([
	#if defined(HAVE_NCURSES_H)
	# include <ncurses.h>
	#elif defined(HAVE_NCURSES_NCURSES_H)
	# include <ncurses/ncurses.h>
	#elif defined(HAVE_CURSES_H)
	# include <curses.h>
	#endif
	],
	[printw((const char *)"Test");]
	)],
	[AC_MSG_RESULT([yes])],
	[
	AC_MSG_RESULT([no])
	AC_MSG_WARN(m4_normalize([Disabling curses because the printw()
	function of your (n)curses library is old.
	If you wish to enable curses, update to a
	newer version (ncurses 5.4 or later is
	recommended, available from
	https://invisible-island.net/ncurses/)
	]))
	AC_DEFINE([HAVE_INCOMPATIBLE_PRINTW], [1],
	[Define to 1 if curses library has incompatible printw()])
	]
	)

	LIBS=$ac_save_LIBS
	cc_restore_flags
	])

	AC_SUBST(CURSESLIBS)
	AC_SUBST(PC_NAME_CURSES)
	AC_SUBST(PC_LIBS_CURSES)

	dnl ========================================================================
	dnl Profiling and GProf
	dnl ========================================================================

	CFLAGS_ORIG="$CFLAGS"
	AS_IF([test $with_coverage -ne $DISABLED],
	[
	with_profiling=$REQUIRED
	PCMK_FEATURES="$PCMK_FEATURES coverage"
	CFLAGS="$CFLAGS -fprofile-arcs -ftest-coverage"
	dnl During linking, make sure to specify -lgcov or -coverage
	]
	)

	AS_IF([test $with_profiling -ne $DISABLED],
	[
	with_profiling=$REQUIRED
	PCMK_FEATURES="$PCMK_FEATURES profile"

	dnl Disable various compiler optimizations
	CFLAGS="$CFLAGS -fno-omit-frame-pointer -fno-inline -fno-builtin"
	dnl CFLAGS="$CFLAGS -fno-inline-functions"
	dnl CFLAGS="$CFLAGS -fno-default-inline"
	dnl CFLAGS="$CFLAGS -fno-inline-functions-called-once"
	dnl CFLAGS="$CFLAGS -fno-optimize-sibling-calls"

	dnl Turn off optimization so tools can get accurate line numbers
	CFLAGS=`echo $CFLAGS \| sed \
	-e 's/-O.\ //g' \
	-e 's/-Wp,-D_FORTIFY_SOURCE=.\ //g' \
	-e 's/-D_FORTIFY_SOURCE=.\ //g'`
	CFLAGS="$CFLAGS -O0 -g3 -gdwarf-2"

	AC_MSG_NOTICE([CFLAGS before adding profiling options: $CFLAGS_ORIG])
	AC_MSG_NOTICE([CFLAGS after: $CFLAGS])
	]
	)
	AC_DEFINE_UNQUOTED([SUPPORT_PROFILING], [$with_profiling], [Support profiling])
	AM_CONDITIONAL([BUILD_PROFILING], [test "$with_profiling" = "$REQUIRED"])

	dnl ========================================================================
	dnl Cluster infrastructure - LibQB
	dnl ========================================================================

	PKG_CHECK_MODULES([libqb], [libqb >= 1.0.1])
	CPPFLAGS="$libqb_CFLAGS $CPPFLAGS"
	LIBS="$libqb_LIBS $LIBS"

	dnl libqb 2.0.5+ (2022-03)
	AC_CHECK_FUNCS([qb_ipcc_connect_async])

	dnl libqb 2.0.2+ (2020-10)
	AC_CHECK_FUNCS([qb_ipcc_auth_get])

	dnl libqb 2.0.0+ (2020-05)
	dnl also defines QB_FEATURE_LOG_HIRES_TIMESTAMPS
	CHECK_ENUM_VALUE([qb/qblog.h],[qb_log_conf],[QB_LOG_CONF_MAX_LINE_LEN])
	CHECK_ENUM_VALUE([qb/qblog.h],[qb_log_conf],[QB_LOG_CONF_ELLIPSIS])

	dnl Support Linux-HA fence agents if available
	AS_IF([test x"$cross_compiling" != x"yes"],
	[CPPFLAGS="$CPPFLAGS -I${prefix}/include/heartbeat"])
	AC_CHECK_HEADERS([stonith/stonith.h],
	[
	AC_CHECK_LIB([pils], [PILLoadPlugin])
	AC_CHECK_LIB([plumb], [G_main_add_IPC_Channel])
	PCMK_FEATURES="$PCMK_FEATURES lha"
	])
	AM_CONDITIONAL([BUILD_LHA_SUPPORT], [test x"$ac_cv_header_stonith_stonith_h" = x"yes"])


	dnl ===============================================
	dnl Detect DBus, systemd, and Upstart support
	dnl ===============================================

	HAVE_dbus=0
	PC_NAME_DBUS=""
	PKG_CHECK_MODULES([DBUS],[dbus-1 >= 1.5.12],
	[
	HAVE_dbus=1
	PC_NAME_DBUS="dbus-1"
	CPPFLAGS="${CPPFLAGS} ${DBUS_CFLAGS}"
	],[])
	AC_DEFINE_UNQUOTED(HAVE_DBUS, $HAVE_dbus, Support dbus)
	AM_CONDITIONAL(BUILD_DBUS, test $HAVE_dbus = 1)
	AC_SUBST(PC_NAME_DBUS)

	check_systemdsystemunitdir() {
	AC_MSG_CHECKING([which system unit file directory to use])
	PKG_CHECK_VAR([systemdsystemunitdir], [systemd], [systemdsystemunitdir])
	AC_MSG_RESULT([${systemdsystemunitdir}])
	test x"$systemdsystemunitdir" != x""
	return $?
	}

	AS_CASE([$enable_systemd],
	[$REQUIRED], [
	AS_IF([test $HAVE_dbus = 0],
	[AC_MSG_FAILURE([Cannot support systemd resources without DBus])])
	AS_IF([test "$ac_cv_have_decl_CLOCK_MONOTONIC" = "no"],
	[AC_MSG_FAILURE([Cannot support systemd resources without monotonic clock])])
	AS_IF([check_systemdsystemunitdir], [],
	[AC_MSG_FAILURE([Cannot support systemd resources without systemdsystemunitdir])])
	],
	[$OPTIONAL], [
	AS_IF([test $HAVE_dbus = 0 \
	\|\| test x"$ac_cv_have_decl_CLOCK_MONOTONIC" = x"no"],
	[enable_systemd=$DISABLED],
	[
	AC_MSG_CHECKING([for systemd version (using dbus-send)])
	ret=$({ dbus-send --system --print-reply \
	--dest=org.freedesktop.systemd1 \
	/org/freedesktop/systemd1 \
	org.freedesktop.DBus.Properties.Get \
	string:org.freedesktop.systemd1.Manager \
	string:Version 2>/dev/null \
	\|\| echo "version unavailable"; } \| tail -n1)
	# sanitize output a bit (interested just in value, not type),
	# ret is intentionally unenquoted so as to normalize whitespace
	ret=$(echo ${ret} \| cut -d' ' -f2-)
	AC_MSG_RESULT([${ret}])
	AS_IF([test x"$ret" != x"unavailable" \
	\|\| systemctl --version 2>/dev/null \| grep -q systemd],
	[
	AS_IF([check_systemdsystemunitdir],
	[enable_systemd=$REQUIRED],
	[enable_systemd=$DISABLED])
	],
	[enable_systemd=$DISABLED]
	)
	])
	],
	)
	AC_MSG_CHECKING([whether to enable support for managing resources via systemd])
	AS_IF([test $enable_systemd -eq $DISABLED], [AC_MSG_RESULT([no])],
	[
	AC_MSG_RESULT([yes])
	PCMK_FEATURES="$PCMK_FEATURES systemd"
	]
	)
	AC_SUBST([systemdsystemunitdir])
	AC_DEFINE_UNQUOTED([SUPPORT_SYSTEMD], [$enable_systemd],
	[Support systemd resources])
	AM_CONDITIONAL([BUILD_SYSTEMD], [test $enable_systemd = $REQUIRED])
	AC_SUBST(SUPPORT_SYSTEMD)

	AS_CASE([$enable_upstart],
	[$REQUIRED], [
	AS_IF([test $HAVE_dbus = 0],
	[AC_MSG_FAILURE([Cannot support Upstart resources without DBus])])
	],
	[$OPTIONAL], [
	AS_IF([test $HAVE_dbus = 0], [enable_upstart=$DISABLED],
	[
	AC_MSG_CHECKING([for Upstart version (using dbus-send)])
	ret=$({ dbus-send --system --print-reply \
	--dest=com.ubuntu.Upstart \
	/com/ubuntu/Upstart org.freedesktop.DBus.Properties.Get \
	string:com.ubuntu.Upstart0_6 string:version 2>/dev/null \
	\|\| echo "version unavailable"; } \| tail -n1)
	# sanitize output a bit (interested just in value, not type),
	# ret is intentionally unenquoted so as to normalize whitespace
	ret=$(echo ${ret} \| cut -d' ' -f2-)
	AC_MSG_RESULT([${ret}])
	AS_IF([test x"$ret" != x"unavailable" \
	\|\| initctl --version 2>/dev/null \| grep -q upstart],
	[enable_upstart=$REQUIRED],
	[enable_upstart=$DISABLED]
	)
	])
	],
	)
	AC_MSG_CHECKING([whether to enable support for managing resources via Upstart])
	AS_IF([test $enable_upstart -eq $DISABLED], [AC_MSG_RESULT([no])],
	[
	AC_MSG_RESULT([yes])
	PCMK_FEATURES="$PCMK_FEATURES upstart"
	]
	)
	AC_DEFINE_UNQUOTED([SUPPORT_UPSTART], [$enable_upstart],
	[Support Upstart resources])
	AM_CONDITIONAL([BUILD_UPSTART], [test $enable_upstart -eq $REQUIRED])
	AC_SUBST(SUPPORT_UPSTART)


	dnl ========================================================================
	dnl Detect Nagios support
	dnl ========================================================================

	AS_CASE([$with_nagios],
	[$REQUIRED], [
	AS_IF([test x"$ac_cv_have_decl_CLOCK_MONOTONIC" = x"no"],
	[AC_MSG_FAILURE([Cannot support nagios resources without monotonic clock])])
	],
	[$OPTIONAL], [
	AS_IF([test x"$ac_cv_have_decl_CLOCK_MONOTONIC" = x"no"],
	[with_nagios=$DISABLED], [with_nagios=$REQUIRED])
	]
	)
	AS_IF([test $with_nagios -eq $REQUIRED], [PCMK_FEATURES="$PCMK_FEATURES nagios"])
	AC_DEFINE_UNQUOTED([SUPPORT_NAGIOS], [$with_nagios], [Support nagios plugins])
	AM_CONDITIONAL([BUILD_NAGIOS], [test $with_nagios -eq $REQUIRED])

	AS_IF([test x"$NAGIOS_PLUGIN_DIR" = x""],
	[NAGIOS_PLUGIN_DIR="${libexecdir}/nagios/plugins"])

	AC_DEFINE_UNQUOTED(NAGIOS_PLUGIN_DIR, "$NAGIOS_PLUGIN_DIR", Directory for nagios plugins)
	AC_SUBST(NAGIOS_PLUGIN_DIR)

	AS_IF([test x"$NAGIOS_METADATA_DIR" = x""],
	[NAGIOS_METADATA_DIR="${datadir}/nagios/plugins-metadata"])

	AC_DEFINE_UNQUOTED(NAGIOS_METADATA_DIR, "$NAGIOS_METADATA_DIR", Directory for nagios plugins metadata)
	AC_SUBST(NAGIOS_METADATA_DIR)

	STACKS=""
	CLUSTERLIBS=""
	PC_NAME_CLUSTER=""

	dnl ========================================================================
	dnl Cluster stack - Corosync
	dnl ========================================================================

	COROSYNC_LIBS=""

	AS_CASE([$with_corosync],
	[$REQUIRED], [
	# These will be fatal if unavailable
	PKG_CHECK_MODULES([cpg], [libcpg])
	PKG_CHECK_MODULES([cfg], [libcfg])
	PKG_CHECK_MODULES([cmap], [libcmap])
	PKG_CHECK_MODULES([quorum], [libquorum])
	PKG_CHECK_MODULES([libcorosync_common], [libcorosync_common])
	]
	[$OPTIONAL], [
	PKG_CHECK_MODULES([cpg], [libcpg], [], [with_corosync=$DISABLED])
	PKG_CHECK_MODULES([cfg], [libcfg], [], [with_corosync=$DISABLED])
	PKG_CHECK_MODULES([cmap], [libcmap], [], [with_corosync=$DISABLED])
	PKG_CHECK_MODULES([quorum], [libquorum], [], [with_corosync=$DISABLED])
	PKG_CHECK_MODULES([libcorosync_common], [libcorosync_common], [], [with_corosync=$DISABLED])
	AS_IF([test $with_corosync -ne $DISABLED], [with_corosync=$REQUIRED])
	]
	)
	AS_IF([test $with_corosync -ne $DISABLED],
	[
	AC_MSG_CHECKING([for Corosync 2 or later])
	AC_MSG_RESULT([yes])
	CFLAGS="$CFLAGS $libqb_CFLAGS $cpg_CFLAGS $cfg_CFLAGS $cmap_CFLAGS $quorum_CFLAGS $libcorosync_common_CFLAGS"
	CPPFLAGS="$CPPFLAGS `$PKG_CONFIG --cflags-only-I corosync`"
	COROSYNC_LIBS="$COROSYNC_LIBS $cpg_LIBS $cfg_LIBS $cmap_LIBS $quorum_LIBS $libcorosync_common_LIBS"
	CLUSTERLIBS="$CLUSTERLIBS $COROSYNC_LIBS"
	PC_NAME_CLUSTER="$PC_CLUSTER_NAME libcfg libcmap libcorosync_common libcpg libquorum"
	STACKS="$STACKS corosync-ge-2"

	dnl Shutdown tracking added (back) to corosync Jan 2021
	saved_LIBS="$LIBS"
	LIBS="$LIBS $COROSYNC_LIBS"
	AC_CHECK_FUNCS([corosync_cfg_trackstart])
	LIBS="$saved_LIBS"
	]
	)
	AC_DEFINE_UNQUOTED([SUPPORT_COROSYNC], [$with_corosync],
	[Support the Corosync messaging and membership layer])
	AM_CONDITIONAL([BUILD_CS_SUPPORT], [test $with_corosync -eq $REQUIRED])
	AC_SUBST([SUPPORT_COROSYNC])

	dnl
	dnl Cluster stack - Sanity
	dnl

	AS_IF([test x"$STACKS" != x""], [AC_MSG_NOTICE([Supported stacks:${STACKS}])],
	[AC_MSG_FAILURE([At least one cluster stack must be supported])])

	PCMK_FEATURES="${PCMK_FEATURES}${STACKS}"

	AC_SUBST(CLUSTERLIBS)
	AC_SUBST(PC_NAME_CLUSTER)

	dnl ========================================================================
	dnl CIB secrets
	dnl ========================================================================

	AS_IF([test $with_cibsecrets -ne $DISABLED],
	[
	with_cibsecrets=$REQUIRED
	PCMK_FEATURES="$PCMK_FEATURES cibsecrets"
	LRM_CIBSECRETS_DIR="${localstatedir}/lib/pacemaker/lrm/secrets"
	AC_DEFINE_UNQUOTED([LRM_CIBSECRETS_DIR], ["$LRM_CIBSECRETS_DIR"],
	[Location for CIB secrets])
	AC_SUBST([LRM_CIBSECRETS_DIR])
	]
	)
	AC_DEFINE_UNQUOTED([SUPPORT_CIBSECRETS], [$with_cibsecrets], [Support CIB secrets])
	AM_CONDITIONAL([BUILD_CIBSECRETS], [test $with_cibsecrets -eq $REQUIRED])

	dnl ========================================================================
	dnl GnuTLS
	dnl ========================================================================

	PKG_CHECK_MODULES(GNUTLS, [gnutls >= 2.12.0],
	[CPPFLAGS="${CPPFLAGS} ${GNUTLS_CFLAGS}"
	LIBS="${LIBS} ${GNUTLS_LIBS}"])

	# --- ASAN/UBSAN/TSAN (see man gcc) ---
	# when using SANitizers, we need to pass the -fsanitize..
	# to both CFLAGS and LDFLAGS. The CFLAGS/LDFLAGS must be
	# specified as first in the list or there will be runtime
	# issues (for example user has to LD_PRELOAD asan for it to work
	# properly).

	AS_IF([test -n "${SANITIZERS}"], [
	SANITIZERS=$(echo $SANITIZERS \| sed -e 's/,/ /g')
	for SANITIZER in $SANITIZERS
	do
	AS_CASE([$SANITIZER],
	[asan\|ASAN], [
	SANITIZERS_CFLAGS="$SANITIZERS_CFLAGS -fsanitize=address"
	SANITIZERS_LDFLAGS="$SANITIZERS_LDFLAGS -fsanitize=address -lasan"
	PCMK_FEATURES="$PCMK_FEATURES asan"
	REQUIRE_LIB([asan],[main])
	],
	[ubsan\|UBSAN], [
	SANITIZERS_CFLAGS="$SANITIZERS_CFLAGS -fsanitize=undefined"
	SANITIZERS_LDFLAGS="$SANITIZERS_LDFLAGS -fsanitize=undefined -lubsan"
	PCMK_FEATURES="$PCMK_FEATURES ubsan"
	REQUIRE_LIB([ubsan],[main])
	],
	[tsan\|TSAN], [
	SANITIZERS_CFLAGS="$SANITIZERS_CFLAGS -fsanitize=thread"
	SANITIZERS_LDFLAGS="$SANITIZERS_LDFLAGS -fsanitize=thread -ltsan"
	PCMK_FEATURES="$PCMK_FEATURES tsan"
	REQUIRE_LIB([tsan],[main])
	])
	done
	])


	dnl ========================================================================
	dnl Compiler flags
	dnl ========================================================================

	dnl Make sure that CFLAGS is not exported. If the user did
	dnl not have CFLAGS in their environment then this should have
	dnl no effect. However if CFLAGS was exported from the user's
	dnl environment, then the new CFLAGS will also be exported
	dnl to sub processes.
	AS_IF([export \| fgrep " CFLAGS=" > /dev/null],
	[
	SAVED_CFLAGS="$CFLAGS"
	unset CFLAGS
	CFLAGS="$SAVED_CFLAGS"
	unset SAVED_CFLAGS
	])

	CC_EXTRAS=""

	AS_IF([test x"$GCC" != x"yes"], [CFLAGS="$CFLAGS -g"], [
	CFLAGS="$CFLAGS -ggdb"

	dnl When we don't have diagnostic push / pull, we can't explicitly disable
	dnl checking for nonliteral formats in the places where they occur on purpose
	dnl thus we disable nonliteral format checking globally as we are aborting
	dnl on warnings.
	dnl what makes the things really ugly is that nonliteral format checking is
	dnl obviously available as an extra switch in very modern gcc but for older
	dnl gcc this is part of -Wformat=2
	dnl so if we have push/pull we can enable -Wformat=2 -Wformat-nonliteral
	dnl if we don't have push/pull but -Wformat-nonliteral we can enable -Wformat=2
	dnl otherwise none of both

	gcc_diagnostic_push_pull=no
	cc_temp_flags "$CFLAGS $WERROR"
	AC_MSG_CHECKING([for gcc diagnostic push / pull])
	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
	#pragma GCC diagnostic push
	#pragma GCC diagnostic pop
	]])],
	[
	AC_MSG_RESULT([yes])
	gcc_diagnostic_push_pull=yes
	], AC_MSG_RESULT([no]))
	cc_restore_flags

	AS_IF([cc_supports_flag "-Wformat-nonliteral"],
	[gcc_format_nonliteral=yes],
	[gcc_format_nonliteral=no])

	# We had to eliminate -Wnested-externs because of libtool changes
	# Make sure to order options so that the former stand for prerequisites
	# of the latter (e.g., -Wformat-nonliteral requires -Wformat).
	EXTRA_FLAGS="-fgnu89-inline"
	EXTRA_FLAGS="$EXTRA_FLAGS -Wall"
	EXTRA_FLAGS="$EXTRA_FLAGS -Waggregate-return"
	EXTRA_FLAGS="$EXTRA_FLAGS -Wbad-function-cast"
	EXTRA_FLAGS="$EXTRA_FLAGS -Wcast-align"
	EXTRA_FLAGS="$EXTRA_FLAGS -Wdeclaration-after-statement"
	EXTRA_FLAGS="$EXTRA_FLAGS -Wendif-labels"
	EXTRA_FLAGS="$EXTRA_FLAGS -Wfloat-equal"
	EXTRA_FLAGS="$EXTRA_FLAGS -Wformat-security"
	EXTRA_FLAGS="$EXTRA_FLAGS -Wimplicit-fallthrough"
	EXTRA_FLAGS="$EXTRA_FLAGS -Wmissing-prototypes"
	EXTRA_FLAGS="$EXTRA_FLAGS -Wmissing-declarations"
	EXTRA_FLAGS="$EXTRA_FLAGS -Wnested-externs"
	EXTRA_FLAGS="$EXTRA_FLAGS -Wno-long-long"
	EXTRA_FLAGS="$EXTRA_FLAGS -Wno-strict-aliasing"
	EXTRA_FLAGS="$EXTRA_FLAGS -Wpointer-arith"
	EXTRA_FLAGS="$EXTRA_FLAGS -Wstrict-prototypes"
	EXTRA_FLAGS="$EXTRA_FLAGS -Wwrite-strings"
	EXTRA_FLAGS="$EXTRA_FLAGS -Wunused-but-set-variable"
	EXTRA_FLAGS="$EXTRA_FLAGS -Wunsigned-char"

	AS_IF([test x"$gcc_diagnostic_push_pull" = x"yes"],
	[
	AC_DEFINE([HAVE_FORMAT_NONLITERAL], [],
	[gcc can complain about nonliterals in format])
	EXTRA_FLAGS="$EXTRA_FLAGS -Wformat=2 -Wformat-nonliteral"
	],
	[test x"$gcc_format_nonliteral" = x"yes"],
	[EXTRA_FLAGS="$EXTRA_FLAGS -Wformat=2"])

	# Additional warnings it might be nice to enable one day
	# -Wshadow
	# -Wunreachable-code
	for j in $EXTRA_FLAGS
	do
	AS_IF([cc_supports_flag $CC_EXTRAS $j], [CC_EXTRAS="$CC_EXTRAS $j"])
	done

	AC_MSG_NOTICE([Using additional gcc flags: ${CC_EXTRAS}])
	])

	dnl
	dnl Hardening flags
	dnl
	dnl The prime control of whether to apply (targeted) hardening build flags and
	dnl which ones is --{enable,disable}-hardening option passed to ./configure:
	dnl
	dnl --enable-hardening=try (default):
	dnl depending on whether any of CFLAGS_HARDENED_EXE, LDFLAGS_HARDENED_EXE,
	dnl CFLAGS_HARDENED_LIB or LDFLAGS_HARDENED_LIB environment variables
	dnl (see below) is set and non-null, all these custom flags (even if not
	dnl set) are used as are, otherwise the best effort is made to offer
	dnl reasonably strong hardening in several categories (RELRO, PIE,
	dnl "bind now", stack protector) according to what the selected toolchain
	dnl can offer
	dnl
	dnl --enable-hardening:
	dnl same effect as --enable-hardening=try when the environment variables
	dnl in question are suppressed
	dnl
	dnl --disable-hardening:
	dnl do not apply any targeted hardening measures at all
	dnl
	dnl The user-injected environment variables that regulate the hardening in
	dnl default case are as follows:
	dnl
	dnl * CFLAGS_HARDENED_EXE, LDFLAGS_HARDENED_EXE
	dnl compiler and linker flags (respectively) for daemon programs
	dnl (pacemakerd, pacemaker-attrd, pacemaker-controld, pacemaker-execd,
	dnl pacemaker-based, pacemaker-fenced, pacemaker-remoted,
	dnl pacemaker-schedulerd)
	dnl
	dnl * CFLAGS_HARDENED_LIB, LDFLAGS_HARDENED_LIB
	dnl compiler and linker flags (respectively) for libraries linked
	dnl with the daemon programs
	dnl
	dnl Note that these are purposedly targeted variables (addressing particular
	dnl targets all over the scattered Makefiles) and have no effect outside of
	dnl the predestined scope (e.g., CLI utilities). For a global reach,
	dnl use CFLAGS, LDFLAGS, etc. as usual.
	dnl
	dnl For guidance on the suitable flags consult, for instance:
	dnl https://fedoraproject.org/wiki/Changes/Harden_All_Packages#Detailed_Harden_Flags_Description
	dnl https://owasp.org/index.php/C-Based_Toolchain_Hardening#GCC.2FBinutils
	dnl

	AS_IF([test $enable_hardening -eq $OPTIONAL],
	[
	AS_IF([test "$(env \| grep -Ec '^(C\|LD)FLAGS_HARDENED_(EXE\|LIB)=.')" = 0],
	[enable_hardening=$REQUIRED],
	[AC_MSG_NOTICE([Hardening: using custom flags from environment])]
	)
	],
	[
	unset CFLAGS_HARDENED_EXE
	unset CFLAGS_HARDENED_LIB
	unset LDFLAGS_HARDENED_EXE
	unset LDFLAGS_HARDENED_LIB
	]
	)
	AS_CASE([$enable_hardening],
	[$DISABLED], [AC_MSG_NOTICE([Hardening: explicitly disabled])],
	[$REQUIRED], [
	CFLAGS_HARDENED_EXE=
	CFLAGS_HARDENED_LIB=
	LDFLAGS_HARDENED_EXE=
	LDFLAGS_HARDENED_LIB=
	relro=0
	pie=0
	bindnow=0
	stackprot="none"
	# daemons incl. libs: partial RELRO
	flag="-Wl,-z,relro"
	CC_CHECK_LDFLAGS(["${flag}"],
	[
	LDFLAGS_HARDENED_EXE="${LDFLAGS_HARDENED_EXE} ${flag}"
	LDFLAGS_HARDENED_LIB="${LDFLAGS_HARDENED_LIB} ${flag}"
	relro=1
	])
	# daemons: PIE for both CFLAGS and LDFLAGS
	AS_IF([cc_supports_flag -fPIE],
	[
	flag="-pie"
	CC_CHECK_LDFLAGS(["${flag}"],
	[
	CFLAGS_HARDENED_EXE="${CFLAGS_HARDENED_EXE} -fPIE"
	LDFLAGS_HARDENED_EXE="${LDFLAGS_HARDENED_EXE} ${flag}"
	pie=1
	])
	]
	)
	# daemons incl. libs: full RELRO if sensible + as-needed linking
	# so as to possibly mitigate startup performance
	# hit caused by excessive linking with unneeded
	# libraries
	AS_IF([test "${relro}" = 1 && test "${pie}" = 1],
	[
	flag="-Wl,-z,now"
	CC_CHECK_LDFLAGS(["${flag}"],
	[
	LDFLAGS_HARDENED_EXE="${LDFLAGS_HARDENED_EXE} ${flag}"
	LDFLAGS_HARDENED_LIB="${LDFLAGS_HARDENED_LIB} ${flag}"
	bindnow=1
	])
	]
	)
	AS_IF([test "${bindnow}" = 1],
	[
	flag="-Wl,--as-needed"
	CC_CHECK_LDFLAGS(["${flag}"],
	[
	LDFLAGS_HARDENED_EXE="${LDFLAGS_HARDENED_EXE} ${flag}"
	LDFLAGS_HARDENED_LIB="${LDFLAGS_HARDENED_LIB} ${flag}"
	])
	])
	# universal: prefer strong > all > default stack protector if possible
	flag=
	AS_IF([cc_supports_flag -fstack-protector-strong],
	[
	flag="-fstack-protector-strong"
	stackprot="strong"
	],
	[cc_supports_flag -fstack-protector-all],
	[
	flag="-fstack-protector-all"
	stackprot="all"
	],
	[cc_supports_flag -fstack-protector],
	[
	flag="-fstack-protector"
	stackprot="default"
	]
	)
	AS_IF([test -n "${flag}"], [CC_EXTRAS="${CC_EXTRAS} ${flag}"])
	# universal: enable stack clash protection if possible
	AS_IF([cc_supports_flag -fstack-clash-protection],
	[
	CC_EXTRAS="${CC_EXTRAS} -fstack-clash-protection"
	AS_IF([test "${stackprot}" = "none"],
	[stackprot="clash-only"],
	[stackprot="${stackprot}+clash"]
	)
	]
	)
	# Log a summary
	AS_IF([test "${relro}" = 1 \|\| test "${pie}" = 1 \|\| test x"${stackprot}" != x"none"],
	[AC_MSG_NOTICE(m4_normalize([Hardening:
	relro=${relro}
	pie=${pie}
	bindnow=${bindnow}
	stackprot=${stackprot}]))
	],
	[AC_MSG_WARN([Hardening: no suitable features in the toolchain detected])]
	)
	],
	)

	CFLAGS="$SANITIZERS_CFLAGS $CFLAGS $CC_EXTRAS"
	LDFLAGS="$SANITIZERS_LDFLAGS $LDFLAGS"
	CFLAGS_HARDENED_EXE="$SANITIZERS_CFLAGS $CFLAGS_HARDENED_EXE"
	LDFLAGS_HARDENED_EXE="$SANITIZERS_LDFLAGS $LDFLAGS_HARDENED_EXE"

	NON_FATAL_CFLAGS="$CFLAGS"
	AC_SUBST(NON_FATAL_CFLAGS)

	dnl
	dnl We reset CFLAGS to include our warnings after all function
	dnl checking goes on, so that our warning flags don't keep the
	dnl AC_*FUNCS() calls above from working. In particular, -Werror will
	dnl always cause us troubles if we set it before here.
	dnl
	dnl
	AS_IF([test $enable_fatal_warnings -ne $DISABLED], [
	AC_MSG_NOTICE([Enabling fatal compiler warnings])
	CFLAGS="$CFLAGS $WERROR"
	])
	AC_SUBST(CFLAGS)

	dnl This is useful for use in Makefiles that need to remove one specific flag
	CFLAGS_COPY="$CFLAGS"
	AC_SUBST(CFLAGS_COPY)

	AC_SUBST(LIBADD_DL) dnl extra flags for dynamic linking libraries

	AC_SUBST(LOCALE)

	dnl Options for cleaning up the compiler output
	AS_IF([test $enable_quiet -ne $DISABLED],
	[
	AC_MSG_NOTICE([Suppressing make details])
	QUIET_LIBTOOL_OPTS="--silent"
	QUIET_MAKE_OPTS="-s" # POSIX compliant
	],
	[
	QUIET_LIBTOOL_OPTS=""
	QUIET_MAKE_OPTS=""
	]
	)

	dnl Put the above variables to use
	LIBTOOL="${LIBTOOL} --tag=CC \$(QUIET_LIBTOOL_OPTS)"
	MAKEFLAGS="${MAKEFLAGS} ${QUIET_MAKE_OPTS}"

	# Make features list available (sorted alphabetically, without leading space)
	PCMK_FEATURES=`echo "$PCMK_FEATURES" \| sed -e 's/^ //' -e 's/ /\n/g' \| sort \| xargs`
	AC_DEFINE_UNQUOTED(CRM_FEATURES, "$PCMK_FEATURES", Set of enabled features)
	AC_SUBST(PCMK_FEATURES)

	AC_SUBST(CC)
	AC_SUBST(MAKEFLAGS)
	AC_SUBST(LIBTOOL)
	AC_SUBST(QUIET_LIBTOOL_OPTS)

	dnl Files we output that need to be executable
	CONFIG_FILES_EXEC([agents/ocf/ClusterMon],
	[agents/ocf/Dummy],
	[agents/ocf/HealthCPU],
	[agents/ocf/HealthIOWait],
	[agents/ocf/HealthSMART],
	[agents/ocf/Stateful],
	[agents/ocf/SysInfo],
	[agents/ocf/attribute],
	[agents/ocf/controld],
	[agents/ocf/ifspeed],
	[agents/ocf/ping],
	[agents/ocf/remote],
	[agents/stonith/fence_legacy],
	[agents/stonith/fence_watchdog],
	[cts/cluster_test],
	[cts/cts],
	[cts/cts-attrd],
	[cts/cts-cli],
	[cts/cts-exec],
	[cts/cts-fencing],
	[cts/cts-lab],
	[cts/cts-regression],
	[cts/cts-scheduler],
	[cts/benchmark/clubench],
	[cts/support/LSBDummy],
	[cts/support/cts-support],
	[cts/support/fence_dummy],
	[cts/support/pacemaker-cts-dummyd],
	[doc/abi-check],
	[maint/bumplibs],
	[tools/cluster-clean],
	[tools/cluster-helper],
	[tools/crm_failcount],
	[tools/crm_master],
	[tools/crm_report],
	[tools/crm_standby],
	[tools/cibsecret],
	[tools/pcmk_simtimes],
	[xml/rng-helper])

	dnl Other files we output
	AC_CONFIG_FILES(Makefile \
	agents/Makefile \
	agents/alerts/Makefile \
	agents/ocf/Makefile \
	agents/stonith/Makefile \
	cts/Makefile \
	cts/benchmark/Makefile \
	cts/scheduler/Makefile \
	cts/scheduler/dot/Makefile \
	cts/scheduler/exp/Makefile \
	cts/scheduler/scores/Makefile \
	cts/scheduler/stderr/Makefile \
	cts/scheduler/summary/Makefile \
	cts/scheduler/xml/Makefile \
	cts/support/Makefile \
	cts/support/pacemaker-cts-dummyd@.service \
	daemons/Makefile \
	daemons/attrd/Makefile \
	daemons/based/Makefile \
	daemons/controld/Makefile \
	daemons/execd/Makefile \
	daemons/execd/pacemaker_remote \
	daemons/execd/pacemaker_remote.service \
	daemons/fenced/Makefile \
	daemons/pacemakerd/Makefile \
	daemons/pacemakerd/pacemaker.combined.upstart \
	daemons/pacemakerd/pacemaker.service \
	daemons/pacemakerd/pacemaker.upstart \
	daemons/schedulerd/Makefile \
	devel/Makefile \
	doc/Doxyfile \
	doc/Makefile \
	doc/sphinx/Makefile \
	etc/Makefile \
	etc/init.d/pacemaker \
	etc/logrotate.d/pacemaker \
	etc/sysconfig/pacemaker \
	include/Makefile \
	include/crm/Makefile \
	include/crm/cib/Makefile \
	include/crm/common/Makefile \
	include/crm/cluster/Makefile \
	include/crm/fencing/Makefile \
	include/crm/pengine/Makefile \
	include/pcmki/Makefile \
	lib/Makefile \
	lib/cib/Makefile \
	lib/cluster/Makefile \
	lib/cluster/tests/Makefile \
	lib/cluster/tests/cluster/Makefile \
	lib/cluster/tests/cpg/Makefile \
	lib/common/Makefile \
	lib/common/tests/Makefile \
	lib/common/tests/acl/Makefile \
	lib/common/tests/actions/Makefile \
	lib/common/tests/agents/Makefile \
	lib/common/tests/cmdline/Makefile \
	lib/common/tests/digest/Makefile \
	lib/common/tests/flags/Makefile \
	lib/common/tests/health/Makefile \
	lib/common/tests/io/Makefile \
	lib/common/tests/iso8601/Makefile \
	lib/common/tests/lists/Makefile \
	lib/common/tests/nodes/Makefile \
	lib/common/tests/nvpair/Makefile \
	lib/common/tests/options/Makefile \
	lib/common/tests/output/Makefile \
	lib/common/tests/probes/Makefile \
	lib/common/tests/procfs/Makefile \
	lib/common/tests/resources/Makefile \
	lib/common/tests/results/Makefile \
	lib/common/tests/rules/Makefile \
	lib/common/tests/scheduler/Makefile \
	lib/common/tests/schemas/Makefile \
	lib/common/tests/scores/Makefile \
	lib/common/tests/strings/Makefile \
	lib/common/tests/utils/Makefile \
	lib/common/tests/xml/Makefile \
	lib/common/tests/xpath/Makefile \
	lib/fencing/Makefile \
	lib/libpacemaker.pc \
	lib/lrmd/Makefile \
	lib/pacemaker/Makefile \
	lib/pacemaker/tests/Makefile \
	lib/pacemaker/tests/pcmk_resource/Makefile \
	lib/pacemaker/tests/pcmk_ticket/Makefile \
	lib/pacemaker.pc \
	lib/pacemaker-cib.pc \
	lib/pacemaker-cluster.pc \
	lib/pacemaker-fencing.pc \
	lib/pacemaker-lrmd.pc \
	lib/pacemaker-service.pc \
	lib/pacemaker-pe_rules.pc \
	lib/pacemaker-pe_status.pc \
	lib/pengine/Makefile \
	lib/pengine/tests/Makefile \
	lib/pengine/tests/native/Makefile \
	lib/pengine/tests/status/Makefile \
	lib/pengine/tests/unpack/Makefile \
	lib/pengine/tests/utils/Makefile \
	lib/services/Makefile \
	maint/Makefile \
	po/Makefile.in \
	python/Makefile \
	python/setup.py \
	python/pacemaker/Makefile \
	python/pacemaker/_cts/Makefile \
	python/pacemaker/_cts/tests/Makefile \
	python/pacemaker/buildoptions.py \
	python/tests/Makefile \
	rpm/Makefile \
	tests/Makefile \
	tools/Makefile \
	tools/crm_mon.service \
	tools/crm_mon.upstart \
	tools/report.collector \
	tools/report.common \
	xml/Makefile \
	xml/pacemaker-schemas.pc \
	)

	dnl Now process the entire list of files added by previous
	dnl calls to AC_CONFIG_FILES()
	AC_OUTPUT()

	dnl *****************
	dnl Configure summary
	dnl *****************

	AC_MSG_NOTICE([])
	AC_MSG_NOTICE([$PACKAGE configuration:])
	AC_MSG_NOTICE([ Version = ${VERSION} (Build: $BUILD_VERSION)])
	AC_MSG_NOTICE([ Features = ${PCMK_FEATURES}])
	AC_MSG_NOTICE([])
	AC_MSG_NOTICE([ Prefix = ${prefix}])
	AC_MSG_NOTICE([ Executables = ${sbindir}])
	AC_MSG_NOTICE([ Man pages = ${mandir}])
	AC_MSG_NOTICE([ Libraries = ${libdir}])
	AC_MSG_NOTICE([ Header files = ${includedir}])
	AC_MSG_NOTICE([ Arch-independent files = ${datadir}])
	AC_MSG_NOTICE([ State information = ${localstatedir}])
	AC_MSG_NOTICE([ System configuration = ${sysconfdir}])
	AC_MSG_NOTICE([ OCF agents = ${OCF_ROOT_DIR}])
	AC_MSG_NOTICE([])
	AC_MSG_NOTICE([ HA group name = ${CRM_DAEMON_GROUP}])
	AC_MSG_NOTICE([ HA user name = ${CRM_DAEMON_USER}])
	AC_MSG_NOTICE([])
	AC_MSG_NOTICE([ CFLAGS = ${CFLAGS}])
	AC_MSG_NOTICE([ CFLAGS_HARDENED_EXE = ${CFLAGS_HARDENED_EXE}])
	AC_MSG_NOTICE([ CFLAGS_HARDENED_LIB = ${CFLAGS_HARDENED_LIB}])
	AC_MSG_NOTICE([ LDFLAGS_HARDENED_EXE = ${LDFLAGS_HARDENED_EXE}])
	AC_MSG_NOTICE([ LDFLAGS_HARDENED_LIB = ${LDFLAGS_HARDENED_LIB}])
	AC_MSG_NOTICE([ Libraries = ${LIBS}])
	AC_MSG_NOTICE([ Stack Libraries = ${CLUSTERLIBS}])
	AC_MSG_NOTICE([ Unix socket auth method = ${us_auth}])

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