diff --git a/configure.ac b/configure.ac
index 190c35bb9b..31595c5d53 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,2183 +1,2184 @@
 dnl
 dnl autoconf for Pacemaker
 dnl
 dnl Copyright 2009-2021 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
 dnl ===============================================
 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])])
 
 AC_DEFUN([AC_DATAROOTDIR_CHECKED])
 
 dnl Suggested structure:
 dnl     information on the package
 dnl     checks for programs
 dnl     checks for libraries
 dnl     checks for header files
 dnl     checks for types
 dnl     checks for structures
 dnl     checks for compiler characteristics
 dnl     checks for library functions
 dnl     checks for system services
 
 m4_include([m4/version.m4])
 AC_INIT([pacemaker], VERSION_NUMBER, [users@clusterlabs.org], [pacemaker],
         PCMK_URL)
 
 PCMK_FEATURES=""
 
 LT_CONFIG_LTDL_DIR([libltdl])
 AC_CONFIG_AUX_DIR([libltdl/config])
 AC_CANONICAL_HOST
 
 dnl Where #defines that autoconf makes (e.g. HAVE_whatever) go
 dnl
 dnl Internal header: include/config.h
 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 External header: include/crm_config.h
 dnl   - Contains a subset of defines checked here
 dnl   - Manually edit include/crm_config.h.in to have configure include
 dnl     new defines
 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(0.27)
 AS_IF([test "x${PKG_CONFIG}" != x], [],
       [AC_MSG_FAILURE([Could not find required build tool pkg-config (0.27 or later)])])
 PKG_INSTALLDIR
 PKG_NOARCH_INSTALLDIR
 
 dnl Example 2.4. Silent Custom Rule to Generate a File
 dnl %-bar.pc: %.pc
 dnl	$(AM_V_GEN)$(LN_S) $(notdir $^) $@
 
 dnl Versioned attributes implementation is not yet production-ready
 AC_DEFINE_UNQUOTED(ENABLE_VERSIONED_ATTRS, 0, [Enable versioned attributes])
 
 CC_IN_CONFIGURE=yes
 export CC_IN_CONFIGURE
 
 LDD=ldd
 
 dnl ========================================================================
 dnl Compiler characteristics
 dnl ========================================================================
 
 dnl A particular compiler can be forced by setting the CC environment variable
 AC_PROG_CC
 
 dnl Use at least C99 if possible. This will generate an "obsolete" warning
 dnl since autoconf 2.70, but is needed for older versions.
 AC_PROG_CC_STDC
 
 dnl C++ is not needed for build, just maintainer utilities
 AC_PROG_CXX
 
 dnl We use md5.c from gnulib, which has its own m4 macros. Per its docs:
 dnl "The macro gl_EARLY must be called as soon as possible after verifying that
 dnl the C compiler is working. ... The core part of the gnulib checks are done
 dnl by the macro gl_INIT." In addition, prevent gnulib from introducing OpenSSL
 dnl as a dependency.
 gl_EARLY
 gl_SET_CRYPTO_CHECK_DEFAULT([no])
 gl_INIT
 
 # --enable-new-dtags: Use RUNPATH instead of RPATH.
 # It is necessary to have this done 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])
 
 AC_TYPE_SIZE_T
 AC_CHECK_SIZEOF(char)
 AC_CHECK_SIZEOF(short)
 AC_CHECK_SIZEOF(int)
 AC_CHECK_SIZEOF(long)
 AC_CHECK_SIZEOF(long long)
 
 dnl ===============================================
 dnl Helpers
 dnl ===============================================
 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
 }
 
 # Some tests need to use their own CFLAGS
 
 cc_temp_flags() {
     ac_save_CFLAGS="$CFLAGS"
     CFLAGS="$*"
 }
 
 cc_restore_flags() {
     CFLAGS=$ac_save_CFLAGS
 }
 
 # expand_path_option $path_variable_name $default
 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])]
     )
 }
 
 # yes_no_try $user_response $default
 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"])
 }
 
 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 $?
 }
 
 dnl ===============================================
 dnl Configure Options
 dnl ===============================================
 
 dnl Actual library checks come later, but pkg-config can be used here to grab
 dnl external values to use as defaults for configure options
 
 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
 
 AC_ARG_ENABLE([compat-2.0],
     [AS_HELP_STRING([--enable-compat-2.0], m4_normalize([
         preserve certain output as it was in 2.0; this option will be
         available only for the lifetime of the 2.1 series @<:@no@:>@]))]
 )
 yes_no_try "$enable_compat_2_0" "no"
 enable_compat_2_0=$?
 AS_IF([test $enable_compat_2_0 -ne $DISABLED],
       [
           AC_DEFINE_UNQUOTED([PCMK__COMPAT_2_0], [1],
                              [Keep certain output compatible with 2.0 release series])
           PCMK_FEATURES="$PCMK_FEATURES compat-2.0"
       ]
 )
 
 # Add an option to create symlinks at the pre-2.0.0 daemon name locations, so
 # that users and tools can continue to invoke those names directly (e.g., for
 # meta-data). This option will be removed in a future release.
 AC_ARG_ENABLE([legacy-links],
     [AS_HELP_STRING([--enable-legacy-links],
         [add symlinks for old daemon names (deprecated) @<:@no@:>@])]
 )
 yes_no_try "$enable_legacy_links" "no"
 enable_legacy_links=$?
 AM_CONDITIONAL([BUILD_LEGACY_LINKS], [test $enable_legacy_links -ne $DISABLED])
 
 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)
 
 # 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
 
 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" ]
 )
 
 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" ]
 )
 
 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" ]
 )
 
 dnl --with-* options: features
 
 AC_ARG_WITH([cibsecrets],
     [AS_HELP_STRING([--with-cibsecrets],
         [support separate file for CIB secrets @<:@no@:>@])]
 )
 yes_no_try "$with_cibsecrets" "no"
 with_cibsecrets=$?
 
 AC_ARG_WITH([gnutls],
     [AS_HELP_STRING([--with-gnutls],
         [support Pacemaker Remote and remote-tls-port using GnuTLS @<:@try@:>@])]
 )
 yes_no_try "$with_gnutls" "try"
 with_gnutls=$?
 
 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 "$with_concurrent_fencing_default" for --with-concurrent-fencing-default])]
 )
 AC_DEFINE_UNQUOTED([PCMK__CONCURRENT_FENCING_DEFAULT],
                    ["$with_concurrent_fencing_default"],
                    [Default value for concurrent-fencing cluster option])
 
 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 "$with_sbd_sync_default" for --with-sbd-sync-default])]
 )
 AC_DEFINE_UNQUOTED([PCMK__SBD_SYNC_DEFAULT],
                    [$with_sbd_sync_default],
                    [Default value for SBD_SYNC_RESOURCE_STARTUP environment variable])
 
 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_DEFINE_UNQUOTED([PCMK__RESOURCE_STICKINESS_DEFAULT],
                    [$with_resource_stickiness_default],
                    [Default value for resource-stickiness resource meta-attribute])
 
 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 @TODO This should be a corosync pkgconfig variable
 PCMK__COROSYNC_CONF=""
 AC_ARG_WITH([corosync-conf],
     [AS_HELP_STRING([--with-corosync-conf], m4_normalize([
         location of Corosync configuration file
         @<:@SYSCONFDIR/corosync/corosync.conf@:>@]))],
     [ PCMK__COROSYNC_CONF="$withval" ]
 )
 
 AC_ARG_WITH([nagios],
     [AS_HELP_STRING([--with-nagios], [support nagios resources])]
 )
 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 @<:@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 @<:@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="$withval" ]
 )
 AC_SUBST(OCF_ROOT_DIR)
 AC_DEFINE_UNQUOTED([OCF_ROOT_DIR], ["$OCF_ROOT_DIR"],
                    [OCF root directory for resource agents and libraries])
 
 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" ]
 )
 AC_SUBST(OCF_RA_PATH)
 
 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" ]
 )
 AC_SUBST(OCF_RA_INSTALL_DIR)
 
 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" ]
 )
 AC_SUBST(PCMK__FENCE_BINDIR)
 
 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_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 General Processing
 dnl ===============================================
 
 AC_DEFINE_UNQUOTED(PACEMAKER_VERSION, "$VERSION",
                    [Version number of this Pacemaker build])
 
 PACKAGE_SERIES=`echo $VERSION | awk -F. '{ print $1"."$2 }'`
 AC_SUBST(PACKAGE_SERIES)
 
 AC_PROG_LN_S
 AC_PROG_MKDIR_P
 
 # Check for fatal warning support
 AS_IF([test $enable_fatal_warnings -ne $DISABLED && test "$GCC" = "yes" && cc_supports_flag -Werror],
       [WERROR="-Werror"],
       [
           WERROR=""
           AS_CASE([$enable_fatal_warnings],
                   [$REQUIRED], [AC_MSG_ERROR([Compiler does not support fatal warnings])],
                   [$OPTIONAL], [
                       AC_MSG_NOTICE([Compiler does not support fatal warnings])
                       enable_fatal_warnings=$DISABLED
                   ])
       ])
 
 AC_MSG_NOTICE([Sanitizing prefix: ${prefix}])
 AS_IF([test "$prefix" = "NONE"],
       [
           prefix=/usr
           dnl Fix default variables - "prefix" variable if not specified
           AS_IF([test "$localstatedir" = "\${prefix}/var"],
                 [localstatedir="/var"])
           AS_IF([test "$sysconfdir" = "\${prefix}/etc"],
                 [sysconfdir="/etc"])
       ])
 
 AC_MSG_NOTICE([Sanitizing exec_prefix: ${exec_prefix}])
 case $exec_prefix in
     prefix|NONE)
         exec_prefix=$prefix
         ;;
 esac
 
 AC_MSG_NOTICE([Sanitizing INITDIR: ${INITDIR}])
 case $INITDIR in
     prefix) INITDIR=$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
             if
                 test -d $initdir
             then
                 INITDIR=$initdir
                 break
             fi
         done
         AC_MSG_RESULT([$INITDIR])
         ;;
 esac
 AC_SUBST(INITDIR)
 
 AC_MSG_NOTICE([Sanitizing libdir: ${libdir}])
 case $libdir in
     prefix|NONE)
         AC_MSG_CHECKING([which lib directory to use])
         for aDir in lib64 lib
         do
             trydir="${exec_prefix}/${aDir}"
             if
                 test -d ${trydir}
             then
                 libdir=${trydir}
                 break
             fi
         done
         AC_MSG_RESULT([$libdir]);
         ;;
 esac
 
 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 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
 
 dnl Home-grown variables
 
 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_DEFINE_UNQUOTED(PCMK__FENCE_BINDIR,"$PCMK__FENCE_BINDIR",
                    [Location for executable fence agents])
 
 expand_path_option OCF_RA_PATH
 AC_DEFINE_UNQUOTED([OCF_RA_PATH], ["$OCF_RA_PATH"],
                    [OCF directories to search for resource agents ])
 
 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])
 
 if test x"${BUG_URL}" = x""; then
     BUG_URL="https://bugs.clusterlabs.org/enter_bug.cgi?product=Pacemaker"
 fi
 AC_SUBST(BUG_URL)
 
 for j in prefix exec_prefix bindir sbindir libexecdir datadir sysconfdir \
     sharedstatedir localstatedir libdir includedir oldincludedir infodir \
     mandir INITDIR docdir CONFIGDIR
 do
     dirname=`eval echo '${'${j}'}'`
     if
         test ! -d "$dirname"
     then
         AC_MSG_WARN([$j directory ($dirname) does not exist (yet)])
     fi
 done
 
 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([US_AUTH_PEERCRED_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([US_AUTH_PEERCRED_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([US_AUTH_GETPEEREID], [1],
                   [Define if Unix socket auth method is
                    getpeereid(s, &uid, &gid)])
     ], [
         # Solaris/OpenIndiana
         AC_CHECK_DECL([getpeerucred], [
             us_auth=getpeerucred;
             AC_DEFINE([US_AUTH_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".
 INIT_EXT=""
 PROCFS=0
 case "$host_os" in
     dnl Solaris and some *BSD versions support procfs but not files we need
     *bsd*)
         INIT_EXT=".sh"
         ;;
     *linux*)
         PROCFS=1
         ;;
     darwin*)
         LIBS="$LIBS -L${prefix}/lib"
         CFLAGS="$CFLAGS -I${prefix}/include"
         ;;
 esac
 
 AC_SUBST(INIT_EXT)
 AC_DEFINE_UNQUOTED([SUPPORT_PROCFS], [$PROCFS],
                    [Define to 1 if procfs is supported])
 
 case "$host_cpu" in
     ppc64|powerpc64)
         case $CFLAGS in
          *powerpc64*)
              ;;
          *)
              if test "$GCC" = yes; then
                  CFLAGS="$CFLAGS -m64"
              fi
              ;;
         esac
         ;;
 esac
 
 # C99 doesn't guarantee uint64_t type and related format specifiers, but
 # prerequisites, corosync + libqb, use that widely, so the target platforms
 # are already pre-constrained to those "64bit-clean" (doesn't imply native
 # bit width) and hence we deliberately refrain from artificial surrogates
 # (sans manipulation through cached values).
 AC_CACHE_VAL(
     [pcmk_cv_decl_inttypes],
     [
         AC_CHECK_DECLS(
             [PRIu64, PRIu32, PRIx32,
              SCNu64],
             [pcmk_cv_decl_inttypes="PRIu64 PRIu32 PRIx32 SCNu64"],
             [
                 # test shall only react on "no" cached result & error out respectively
                 if test "x$ac_cv_have_decl_PRIu64" = xno; then
                     AC_MSG_ERROR([lack of inttypes.h based specifier serving uint64_t (PRIu64)])
                 elif test "x$ac_cv_have_decl_PRIu32" = xno; then
                     AC_MSG_ERROR([lack of inttypes.h based specifier serving uint32_t (PRIu32)])
                 elif test "x$ac_cv_have_decl_PRIx32" = xno; then
                     AC_MSG_ERROR([lack of inttypes.h based hexa specifier serving uint32_t (PRIx32)])
                 elif test "x$ac_cv_have_decl_SCNu64" = xno; then
                     AC_MSG_ERROR([lack of inttypes.h based specifier gathering uint64_t (SCNu64)])
                 fi
             ],
             [[#include <inttypes.h>]]
         )
     ]
 )
 (
     set $pcmk_cv_decl_inttypes
     AC_DEFINE_UNQUOTED([U64T],  [$1], [Correct format specifier for U64T])
     AC_DEFINE_UNQUOTED([U32T],  [$2], [Correct format specifier for U32T])
     AC_DEFINE_UNQUOTED([X32T],  [$3], [Correct format specifier for X32T])
     AC_DEFINE_UNQUOTED([U64TS], [$4], [Correct format specifier for U64TS])
 )
 
 dnl ===============================================
 dnl Program Paths
 dnl ===============================================
 
 PATH="$PATH:/sbin:/usr/sbin:/usr/local/sbin:/usr/local/bin"
 export PATH
 
 dnl Replacing AC_PROG_LIBTOOL with AC_CHECK_PROG because LIBTOOL
 dnl was NOT being expanded all the time thus causing things to fail.
 AC_CHECK_PROGS(LIBTOOL, glibtool libtool libtool15 libtool13)
 AS_IF([test "x${LIBTOOL}" != "x"], [],
       [AC_MSG_FAILURE([Could not find required build tool libtool (or equivalent)])])
 
 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 Ensure PYTHON is an absolute path
 AS_IF([test x"${PYTHON}" != x""], [AC_PATH_PROG([PYTHON], [$PYTHON])])
 
 dnl Require a minimum Python version
 AM_PATH_PYTHON([3.4])
 
 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])
 
 dnl Bash is needed for building man pages and running regression tests.
 dnl BASH is already an environment variable, so use something else.
 AC_PATH_PROG([BASH_PATH], [bash])
 AS_IF([test "x${BASH_PATH}" != "x"], [],
       [AC_MSG_FAILURE([Could not find required build tool bash])])
 
 AC_PATH_PROGS(VALGRIND_BIN, valgrind, /usr/bin/valgrind)
 AC_DEFINE_UNQUOTED(VALGRIND_BIN, "$VALGRIND_BIN", Valgrind command)
 
 AM_CONDITIONAL(BUILD_HELP, test x"${HELP2MAN}" != x"")
 if test x"${HELP2MAN}" != x""; then
     PCMK_FEATURES="$PCMK_FEATURES generated-manpages"
 fi
 
 MANPAGE_XSLT=""
 if test x"${XSLTPROC}" != x""; then
     AC_MSG_CHECKING([for DocBook-to-manpage transform])
     # first try to figure out correct template using xmlcatalog query,
     # resort to extensive (semi-deterministic) file search if that fails
     DOCBOOK_XSL_URI='http://docbook.sourceforge.net/release/xsl/current'
     DOCBOOK_XSL_PATH='manpages/docbook.xsl'
     MANPAGE_XSLT=$(${XMLCATALOG} "" ${DOCBOOK_XSL_URI}/${DOCBOOK_XSL_PATH} \
                    | sed -n 's|^file://||p;q')
     if test x"${MANPAGE_XSLT}" = x""; then
         DIRS=$(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 ${DIRS}
         do
             if test -f "${d}/${XSLT}"; then
                  MANPAGE_XSLT="${d}/${XSLT}"
                  break
             fi
         done
     fi
 fi
 AC_MSG_RESULT([$MANPAGE_XSLT])
 AC_SUBST(MANPAGE_XSLT)
 
 AM_CONDITIONAL(BUILD_XML_HELP, test x"${MANPAGE_XSLT}" != x"")
 if test x"${MANPAGE_XSLT}" != x""; then
     PCMK_FEATURES="$PCMK_FEATURES agent-manpages"
 fi
 
 AM_CONDITIONAL([IS_ASCIIDOC], [echo "${ASCIIDOC_CONV}" | grep -Eq 'asciidoc$'])
 AM_CONDITIONAL([BUILD_ASCIIDOC], [test "x${ASCIIDOC_CONV}" != x])
 if test "x${ASCIIDOC_CONV}" != x; then
     PCMK_FEATURES="$PCMK_FEATURES ascii-docs"
 fi
 
 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="${PATH_DIR}/getopt"
     if test -f "$GETOPT_PATH" && test -x "$GETOPT_PATH" ; then
         $GETOPT_PATH -T >/dev/null 2>/dev/null
         if test $? -eq 4; then
             break
         fi
     fi
     GETOPT_PATH=""
 done
 IFS=$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 checks for library functions to replace them
 dnl
 dnl     NoSuchFunctionName:
 dnl             is a dummy function which no system supplies.  It is here to make
 dnl             the system compile semi-correctly on OpenBSD which doesn't know
 dnl             how to create an empty archive
 dnl
 dnl     scandir: Only on BSD.
 dnl             System-V systems may have it, but hidden and/or deprecated.
 dnl             A replacement function is supplied for it.
 dnl
 dnl     strerror: returns a string that corresponds to an errno.
 dnl             A replacement function is supplied for it.
 dnl
 dnl     strnlen: is a gnu function similar to strlen, but safer.
 dnl            We wrote a tolerably-fast replacement function for it.
 dnl
 dnl     strndup: is a gnu function similar to strdup, but safer.
 dnl            We wrote a tolerably-fast replacement function for it.
 
 AC_REPLACE_FUNCS(alphasort NoSuchFunctionName scandir strerror strchrnul strnlen strndup)
 
 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])
 if test "$ac_cv_func_sched_setscheduler" != yes; then
         PC_LIBS_RT=""
 else
         PC_LIBS_RT="-lrt"
 fi
 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?
 #
 if test "$ac_cv_lib_c_dlopen" = yes; then
     LIBADD_DL=""
 elif test "$ac_cv_lib_dl_dlopen" = yes; then
     LIBADD_DL=-ldl
 else
     LIBADD_DL=${lt_cv_dlopen_libs}
 fi
 
 PKG_CHECK_MODULES(LIBXML2, [libxml-2.0],
                   [CPPFLAGS="${CPPFLAGS} ${LIBXML2_CFLAGS}"
                    LIBS="${LIBS} ${LIBXML2_LIBS}"])
 
 REQUIRE_LIB([xslt], [xsltApplyStylesheet])
 
 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([getopt.h])
 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([errno.h])
 REQUIRE_HEADER([glib.h])
 REQUIRE_HEADER([grp.h])
 REQUIRE_HEADER([limits.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([pwd.h])
 REQUIRE_HEADER([signal.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/utsname.h])
 REQUIRE_HEADER([sys/wait.h])
 REQUIRE_HEADER([time.h])
 REQUIRE_HEADER([unistd.h])
 REQUIRE_HEADER([libxml/xpath.h])
 REQUIRE_HEADER([libxslt/xslt.h])
 
 cc_restore_flags
 
 AC_CHECK_FUNCS([uuid_unparse], [],
                [AC_MSG_FAILURE([Could not find required C function uuid_unparse()])])
 
 AC_CACHE_CHECK([whether __progname and __progname_full are available],
                [pf_cv_var_progname], AC_LINK_IFELSE([
                    AC_LANG_PROGRAM([[extern char *__progname, *__progname_full;]],
                                    [[__progname = "foo"; __progname_full = "foo bar";]],
                                    [pf_cv_var_progname="yes"],
                                    [pf_cv_var_progname="no"])
                ]))
 AS_IF([test "$pf_cv_var_progname" = "yes"], [AC_DEFINE(HAVE___PROGNAME,1,[ ])])
 
 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>
 ]])
 
 cc_temp_flags "$CFLAGS -Wl,--wrap=uname"
 
 WRAPPABLE_UNAME="no"
 
 AC_MSG_CHECKING([if uname() can be wrapped])
 AC_RUN_IFELSE([AC_LANG_SOURCE([[
 #include <sys/utsname.h>
 int __wrap_uname(struct utsname *buf) {
 return 100;
 }
 int main(int argc, char **argv) {
 struct utsname x;
 return uname(&x) == 100 ? 0 : 1;
 }
 ]])],
                    [ WRAPPABLE_UNAME="yes" ], [ WRAPPABLE_UNAME="no"])
 AC_MSG_RESULT([$WRAPPABLE_UNAME])
 AM_CONDITIONAL([WRAPPABLE_UNAME], [test "$WRAPPABLE_UNAME" = "yes"])
 
 cc_restore_flags
 
 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([getopt])
 REQUIRE_FUNC([setenv])
 REQUIRE_FUNC([unsetenv])
 
 AC_CACHE_CHECK(whether sscanf supports %m,
                pf_cv_var_sscanf,
                AC_RUN_IFELSE([AC_LANG_SOURCE([[
 #include <stdio.h>
 const char *s = "some-command-line-arg";
 int main(int argc, char **argv) {
 char *name = NULL;
 int n = sscanf(s, "%ms", &name);
 return n == 1 ? 0 : 1;
 }
 ]])],
                                  pf_cv_var_sscanf="yes", pf_cv_var_sscanf="no", pf_cv_var_sscanf="no"))
 
 AS_IF([test "$pf_cv_var_sscanf" = "yes"], [AC_DEFINE(SSCANF_HAS_M, 1, [ ])])
 
 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 "$ac_cv_header_ncurses_h" = "yes"], [
     AC_CHECK_LIB(ncurses, printw,
                  [AC_DEFINE(HAVE_LIBNCURSES,1, have ncurses library)])
     CURSESLIBS=`$PKG_CONFIG --libs ncurses` || CURSESLIBS='-lncurses'
     PC_NAME_CURSES="ncurses"
 ])
 
 AS_IF([test "$ac_cv_header_ncurses_ncurses_h" = "yes"], [
     AC_CHECK_LIB(ncurses, printw,
                  [AC_DEFINE(HAVE_LIBNCURSES,1, have ncurses library)])
     CURSESLIBS=`$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"$CURSESLIBS" = X"" && test "$ac_cv_header_curses_h" = "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"$CURSESLIBS" = X"" && test "$ac_cv_header_curses_curses_h" = "yes"], [
     AC_CHECK_LIB(curses, printw,
                  [CURSESLIBS='-lcurses'; AC_DEFINE(HAVE_LIBCURSES,1, have curses library)])
     PC_LIBS_CURSES="$CURSESLIBS"
 ])
 
 if test "x$CURSESLIBS" != "x"; then
     PCMK_FEATURES="$PCMK_FEATURES ncurses"
 fi
 
 dnl Check for printw() prototype compatibility
 AS_IF([test X"$CURSESLIBS" != X"" && cc_supports_flag -Wcast-qual], [
     ac_save_LIBS=$LIBS
     LIBS="$CURSESLIBS"
     cc_temp_flags "-Wcast-qual $WERROR"
     # avoid broken test because of hardened build environment in Fedora 23+
     # - https://fedoraproject.org/wiki/Changes/Harden_All_Packages
     # - https://bugzilla.redhat.com/1297985
     AS_IF([cc_supports_flag -fPIC], [CFLAGS="$CFLAGS -fPIC"])
 
     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 >= 0.17)
 CPPFLAGS="$libqb_CFLAGS $CPPFLAGS"
 LIBS="$libqb_LIBS $LIBS"
 
 dnl libqb 2.0.2+ (2020-10)
 AC_CHECK_FUNCS(qb_ipcc_auth_get,
                AC_DEFINE(HAVE_IPCC_AUTH_GET, 1,
                          [Have qb_ipcc_auth_get function]))
 
 dnl libqb 2.0.0+ (2020-05)
 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
 if test "$cross_compiling" != "yes"; then
     CPPFLAGS="$CPPFLAGS -I${prefix}/include/heartbeat"
 fi
 AC_CHECK_HEADERS([stonith/stonith.h],
                  [
                      AC_CHECK_LIB([pils], [PILLoadPlugin])
                      AC_CHECK_LIB([plumb], [G_main_add_IPC_Channel])
                      PCMK_FEATURES="$PCMK_FEATURES lha"
                  ])
 AM_CONDITIONAL([BUILD_LHA_SUPPORT], [test "$ac_cv_header_stonith_stonith_h" = "yes"])
 
 dnl ===============================================
 dnl Variables needed for substitution
 dnl ===============================================
 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)
 
 CRM_CORE_DIR="${localstatedir}/lib/pacemaker/cores"
 AC_DEFINE_UNQUOTED(CRM_CORE_DIR,"$CRM_CORE_DIR", Location to store core files produced by Pacemaker daemons)
 AC_SUBST(CRM_CORE_DIR)
 
 if test x"${CRM_DAEMON_USER}" = x""; then
     CRM_DAEMON_USER="hacluster"
 fi
 AC_DEFINE_UNQUOTED(CRM_DAEMON_USER,"$CRM_DAEMON_USER", User to run Pacemaker daemons as)
 AC_SUBST(CRM_DAEMON_USER)
 
 if test x"${CRM_DAEMON_GROUP}" = x""; then
     CRM_DAEMON_GROUP="haclient"
 fi
 AC_DEFINE_UNQUOTED(CRM_DAEMON_GROUP,"$CRM_DAEMON_GROUP", Group to run Pacemaker daemons as)
 AC_SUBST(CRM_DAEMON_GROUP)
 
 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_CONFIG_CTS="${localstatedir}/lib/pacemaker/cts"
 AC_DEFINE_UNQUOTED(CRM_CONFIG_CTS,"$CRM_CONFIG_CTS", Where to keep cts stateful data)
 AC_SUBST(CRM_CONFIG_CTS)
 
 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])
 
 AC_PATH_PROGS(GIT, git false)
 
 AC_MSG_CHECKING([build version])
 BUILD_VERSION=$Format:%h$
 if test $BUILD_VERSION != ":%h$"; then
     AC_MSG_RESULT([$BUILD_VERSION (archive hash)])
 elif test -x $GIT && test -d .git; then
     BUILD_VERSION=`$GIT log --pretty="format:%h" -n 1`
     AC_MSG_RESULT([$BUILD_VERSION (git hash)])
 else
     # 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)])
 fi
 
 AC_DEFINE_UNQUOTED(BUILD_VERSION, "$BUILD_VERSION", Build version)
 AC_SUBST(BUILD_VERSION)
 
 HAVE_dbus=1
 PKG_CHECK_MODULES([DBUS], [dbus-1],
                   [CPPFLAGS="${CPPFLAGS} ${DBUS_CFLAGS}"],
                   [HAVE_dbus=0])
 AC_DEFINE_UNQUOTED(SUPPORT_DBUS, $HAVE_dbus, Support dbus)
 AM_CONDITIONAL(BUILD_DBUS, test $HAVE_dbus = 1)
 AC_CHECK_TYPES([DBusBasicValue],,,[[#include <dbus/dbus.h>]])
 if test $HAVE_dbus = 0; then
         PC_NAME_DBUS=""
 else
         PC_NAME_DBUS="dbus-1"
 fi
 AC_SUBST(PC_NAME_DBUS)
 
 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 $HAVE_dbus = 0 \
                    || test "$ac_cv_have_decl_CLOCK_MONOTONIC" = "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 "$ret" != "unavailable" \
                              || systemctl --version 2>/dev/null | grep -q systemd],
                             [
                                 AS_IF([check_systemdsystemunitdir],
                                       [enable_systemd=$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 "$ret" != "unavailable" \
                              || initctl --version 2>/dev/null | grep -q upstart],
                             [enable_upstart=$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)
 
 AS_CASE([$with_nagios],
         [$REQUIRED], [
             AS_IF([test "$ac_cv_have_decl_CLOCK_MONOTONIC" = "no"],
                   [AC_MSG_FAILURE([Cannot support nagios resources without monotonic clock])])
         ],
         [$OPTIONAL], [
             AS_IF([test "$ac_cv_have_decl_CLOCK_MONOTONIC" = "no"],
                   [with_nagios=$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])
 
 if test x"$NAGIOS_PLUGIN_DIR" = x""; then
     NAGIOS_PLUGIN_DIR="${libexecdir}/nagios/plugins"
 fi
 
 AC_DEFINE_UNQUOTED(NAGIOS_PLUGIN_DIR, "$NAGIOS_PLUGIN_DIR", Directory for nagios plugins)
 AC_SUBST(NAGIOS_PLUGIN_DIR)
 
 if test x"$NAGIOS_METADATA_DIR" = x""; then
     NAGIOS_METADATA_DIR="${datadir}/nagios/plugins-metadata"
 fi
 
 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 $libcorosync_common_CFLAGS"
           COROSYNC_LIBS="$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 $COROSYNC_LIBS"
           AC_CHECK_FUNCS(corosync_cfg_trackstart,
           AC_DEFINE(HAVE_COROSYNC_CFG_TRACKSTART, 1,
                          [Have corosync_cfg_trackstart function]))
           LIBS="$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 ========================================================================
 
 dnl Require GnuTLS >=2.12.0 (2011-03) for Pacemaker Remote support
 PC_NAME_GNUTLS=""
 AS_CASE([$with_gnutls],
         [$REQUIRED], [
             REQUIRE_LIB([gnutls], [gnutls_sec_param_to_pk_bits])
             REQUIRE_HEADER([gnutls/gnutls.h])
         ],
         [$OPTIONAL], [
             AC_CHECK_LIB([gnutls], [gnutls_sec_param_to_pk_bits],
                          [], [with_gnutls=$DISABLED])
             AC_CHECK_HEADERS([gnutls/gnutls.h], [], [with_gnutls=$DISABLED])
         ]
 )
 AS_IF([test $with_gnutls -ne $DISABLED],
       [
           PC_NAME_GNUTLS="gnutls"
           PCMK_FEATURES="$PCMK_FEATURES remote"
       ]
 )
 AC_SUBST([PC_NAME_GNUTLS])
 AM_CONDITIONAL([BUILD_REMOTE], [test $with_gnutls -ne $DISABLED])
 
 dnl ========================================================================
 dnl    System Health
 dnl ========================================================================
 
 dnl Check if servicelog development package is installed
 SERVICELOG=servicelog-1
 SERVICELOG_EXISTS="no"
 AC_MSG_CHECKING([for $SERVICELOG packages])
 if
     $PKG_CONFIG --exists $SERVICELOG
 then
     PKG_CHECK_MODULES([SERVICELOG], [servicelog-1])
     SERVICELOG_EXISTS="yes"
     PCMK_FEATURES="$PCMK_FEATURES servicelog"
 fi
 AC_MSG_RESULT([$SERVICELOG_EXISTS])
 AM_CONDITIONAL(BUILD_SERVICELOG, test "$SERVICELOG_EXISTS" = "yes")
 
 dnl Check if OpenIMPI packages and servicelog are installed
 OPENIPMI="OpenIPMI OpenIPMIposix"
 OPENIPMI_SERVICELOG_EXISTS="no"
 AC_MSG_CHECKING([for $SERVICELOG $OPENIPMI packages])
 if
     $PKG_CONFIG --exists $OPENIPMI $SERVICELOG
 then
     PKG_CHECK_MODULES([OPENIPMI_SERVICELOG],[OpenIPMI OpenIPMIposix])
     REQUIRE_HEADER([malloc.h])
     OPENIPMI_SERVICELOG_EXISTS="yes"
     PCMK_FEATURES="$PCMK_FEATURES ipmiservicelogd"
 fi
 AC_MSG_RESULT([$OPENIPMI_SERVICELOG_EXISTS])
 AM_CONDITIONAL(BUILD_OPENIPMI_SERVICELOG, test "$OPENIPMI_SERVICELOG_EXISTS" = "yes")
 
 # --- 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.
 if export | fgrep " CFLAGS=" > /dev/null; then
     SAVED_CFLAGS="$CFLAGS"
     unset CFLAGS
     CFLAGS="$SAVED_CFLAGS"
     unset SAVED_CFLAGS
 fi
 
 CC_EXTRAS=""
 
 AS_IF([test "$GCC" != yes], [CFLAGS="$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="$EXTRA_FLAGS -Wmissing-prototypes"
     EXTRA_FLAGS="$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$gcc_diagnostic_push_pull" = "xyes"],
           [
               AC_DEFINE([GCC_FORMAT_NONLITERAL_CHECKING_ENABLED], [],
                         [gcc can complain about nonliterals in format])
               EXTRA_FLAGS="$EXTRA_FLAGS -Wformat=2 -Wformat-nonliteral"
           ],
           [test "x$gcc_format_nonliteral" = "xyes"],
           [EXTRA_FLAGS="$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 "${stackprot}" != "none"],
                   [AC_MSG_NOTICE(m4_normalize([Hardening:
                         relro=${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([cts/cts-cli],
                   [cts/cts-coverage],
                   [cts/cts-exec],
                   [cts/cts-fencing],
                   [cts/cts-regression],
                   [cts/cts-scheduler],
                   [cts/lxc_autogen.sh],
                   [cts/benchmark/clubench],
                   [cts/lab/CTSlab.py],
                   [cts/lab/OCFIPraTest.py],
                   [cts/lab/cluster_test],
                   [cts/lab/cts],
                   [cts/lab/cts-log-watcher],
                   [cts/support/LSBDummy],
                   [cts/support/cts-support],
                   [cts/support/fence_dummy],
                   [cts/support/pacemaker-cts-dummyd],
                   [daemons/fenced/fence_legacy],
                   [daemons/fenced/fence_watchdog],
                   [doc/abi-check],
                   [extra/resources/ClusterMon],
                   [extra/resources/HealthSMART],
                   [extra/resources/SysInfo],
                   [extra/resources/ifspeed],
                   [extra/resources/o2cb],
                   [maint/bumplibs],
                   [tools/crm_failcount],
                   [tools/crm_master],
                   [tools/crm_report],
                   [tools/crm_standby],
                   [tools/cibsecret],
                   [tools/pcmk_simtimes])
 
 dnl Other files we output
 AC_CONFIG_FILES(Makefile                                            \
                 cts/Makefile                                        \
                 cts/benchmark/Makefile                              \
                 cts/lab/Makefile                                    \
                 cts/lab/CTSvars.py                                  \
                 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.service                \
                 daemons/pacemakerd/pacemaker.upstart                \
                 daemons/pacemakerd/pacemaker.combined.upstart       \
                 daemons/schedulerd/Makefile                         \
                 devel/Makefile                                      \
                 doc/Doxyfile                                        \
                 doc/Makefile                                        \
                 doc/sphinx/Makefile                                 \
                 etc/Makefile                                        \
                 etc/init.d/pacemaker                                \
                 etc/logrotate.d/pacemaker                           \
                 extra/Makefile                                      \
                 extra/alerts/Makefile                               \
                 extra/resources/Makefile                            \
                 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                              \
                 replace/Makefile                                    \
                 lib/Makefile                                        \
                 lib/libpacemaker.pc                                 \
                 lib/pacemaker.pc                                    \
                 lib/pacemaker-cib.pc                                \
                 lib/pacemaker-lrmd.pc                               \
                 lib/pacemaker-service.pc                            \
                 lib/pacemaker-pe_rules.pc                           \
                 lib/pacemaker-pe_status.pc                          \
                 lib/pacemaker-fencing.pc                            \
                 lib/pacemaker-cluster.pc                            \
                 lib/common/Makefile                                 \
                 lib/common/tests/Makefile                           \
+                lib/common/tests/acl/Makefile                   \
                 lib/common/tests/agents/Makefile                    \
                 lib/common/tests/cmdline/Makefile                   \
                 lib/common/tests/flags/Makefile                     \
                 lib/common/tests/io/Makefile                        \
                 lib/common/tests/iso8601/Makefile                   \
                 lib/common/tests/nvpair/Makefile                    \
                 lib/common/tests/operations/Makefile                \
                 lib/common/tests/results/Makefile                   \
                 lib/common/tests/strings/Makefile                   \
                 lib/common/tests/utils/Makefile                     \
                 lib/common/tests/xpath/Makefile                     \
                 lib/cluster/Makefile                                \
                 lib/cib/Makefile                                    \
                 lib/gnu/Makefile                                    \
                 lib/pacemaker/Makefile                              \
                 lib/pengine/Makefile                                \
                 lib/pengine/tests/Makefile                          \
                 lib/pengine/tests/rules/Makefile                    \
                 lib/fencing/Makefile                                \
                 lib/lrmd/Makefile                                   \
                 lib/services/Makefile                               \
                 maint/Makefile                                      \
                 rpm/Makefile                                        \
                 tests/Makefile                                      \
                 tools/Makefile                                      \
                 tools/report.collector                              \
                 tools/report.common                                 \
                 tools/crm_mon.service                               \
                 tools/crm_mon.upstart                               \
                 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}])
diff --git a/lib/common/tests/Makefile.am b/lib/common/tests/Makefile.am
index aa9bce2389..889c4fcdc2 100644
--- a/lib/common/tests/Makefile.am
+++ b/lib/common/tests/Makefile.am
@@ -1,21 +1,22 @@
 #
 # Copyright 2020-2021 the Pacemaker project contributors
 #
 # The version control history for this file may have further details.
 #
 # This source code is licensed under the GNU General Public License version 2
 # or later (GPLv2+) WITHOUT ANY WARRANTY.
 #
 
 SUBDIRS = \
+	acl			\
 	agents		\
 	cmdline		\
 	flags		\
-	io		\
+	io			\
 	iso8601		\
 	nvpair 		\
 	operations	\
 	results		\
 	strings		\
 	utils		\
 	xpath
diff --git a/lib/common/tests/acl/Makefile.am b/lib/common/tests/acl/Makefile.am
new file mode 100644
index 0000000000..679c9cb8e6
--- /dev/null
+++ b/lib/common/tests/acl/Makefile.am
@@ -0,0 +1,21 @@
+#
+# Copyright 2021 the Pacemaker project contributors
+#
+# The version control history for this file may have further details.
+#
+# This source code is licensed under the GNU General Public License version 2
+# or later (GPLv2+) WITHOUT ANY WARRANTY.
+#
+AM_CPPFLAGS = -I$(top_srcdir)/include -I$(top_builddir)/include
+LDADD = $(top_builddir)/lib/common/libcrmcommon.la -lcmocka
+
+include $(top_srcdir)/mk/tap.mk
+
+# Add "_test" to the end of all test program names to simplify .gitignore.
+
+check_PROGRAMS = \
+	pcmk_acl_required_test \
+    xml_acl_denied_test \
+    xml_acl_enabled_test
+
+TESTS = $(check_PROGRAMS)
diff --git a/lib/common/tests/acl/pcmk_acl_required_test.c b/lib/common/tests/acl/pcmk_acl_required_test.c
new file mode 100644
index 0000000000..87bfe494f8
--- /dev/null
+++ b/lib/common/tests/acl/pcmk_acl_required_test.c
@@ -0,0 +1,38 @@
+/*
+ * Copyright 2020-2021 the Pacemaker project contributors
+ *
+ * The version control history for this file may have further details.
+ *
+ * This source code is licensed under the GNU Lesser General Public License
+ * version 2.1 or later (LGPLv2.1+) WITHOUT ANY WARRANTY.
+ */
+
+#include <crm_internal.h>
+#include <crm/common/acl.h>
+
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <setjmp.h>
+#include <cmocka.h>
+
+static void
+is_pcmk_acl_required(void **state)
+{
+    assert_false(pcmk_acl_required(NULL));
+    assert_false(pcmk_acl_required(""));
+    assert_true(pcmk_acl_required("123"));
+    assert_false(pcmk_acl_required(CRM_DAEMON_USER));
+    assert_false(pcmk_acl_required("root"));
+}
+
+int
+main(int argc, char **argv)
+{
+    const struct CMUnitTest tests[] = {
+        cmocka_unit_test(is_pcmk_acl_required),
+    };
+
+    cmocka_set_message_output(CM_OUTPUT_TAP);
+    return cmocka_run_group_tests(tests, NULL, NULL);
+}
diff --git a/lib/common/tests/acl/xml_acl_denied_test.c b/lib/common/tests/acl/xml_acl_denied_test.c
new file mode 100644
index 0000000000..7e01177854
--- /dev/null
+++ b/lib/common/tests/acl/xml_acl_denied_test.c
@@ -0,0 +1,72 @@
+/*
+ * Copyright 2020-2021 the Pacemaker project contributors
+ *
+ * The version control history for this file may have further details.
+ *
+ * This source code is licensed under the GNU Lesser General Public License
+ * version 2.1 or later (LGPLv2.1+) WITHOUT ANY WARRANTY.
+ */
+
+#include <crm_internal.h>
+#include <crm/common/acl.h>
+#include "../../crmcommon_private.h"
+
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <setjmp.h>
+#include <cmocka.h>
+
+static void
+is_xml_acl_denied_without_node(void **state)
+{
+    xmlNode *test_xml = create_xml_node(NULL, "test_xml");
+    assert_false(xml_acl_denied(test_xml));
+
+    test_xml->doc->_private = NULL;
+    assert_false(xml_acl_denied(test_xml));
+
+    test_xml->doc = NULL;
+    assert_false(xml_acl_denied(test_xml));
+
+    test_xml = NULL;
+    assert_false(xml_acl_denied(test_xml));
+}
+
+static void
+is_xml_acl_denied_with_node(void **state)
+{
+    xml_private_t *p;
+    
+    xmlNode *test_xml = create_xml_node(NULL, "test_xml");
+
+    // allocate memory for _private, which is NULL by default
+    test_xml->doc->_private = calloc(1, sizeof(xml_private_t));
+
+    assert_false(xml_acl_denied(test_xml));
+
+    // cast _private from void* to xml_private_t*
+    p = test_xml->doc->_private;
+
+    // enable an irrelevant flag
+    p->flags |= pcmk__xf_acl_enabled;
+
+    assert_false(xml_acl_denied(test_xml));
+
+    // enable pcmk__xf_acl_denied
+    p->flags |= pcmk__xf_acl_denied;
+
+    assert_true(xml_acl_denied(test_xml));
+}
+
+int
+main(int argc, char **argv)
+{
+    const struct CMUnitTest tests[] = {
+        cmocka_unit_test(is_xml_acl_denied_without_node),
+        cmocka_unit_test(is_xml_acl_denied_with_node),
+    };
+
+    cmocka_set_message_output(CM_OUTPUT_TAP);
+    return cmocka_run_group_tests(tests, NULL, NULL);
+}
diff --git a/lib/common/tests/acl/xml_acl_enabled_test.c b/lib/common/tests/acl/xml_acl_enabled_test.c
new file mode 100644
index 0000000000..669aaec7e5
--- /dev/null
+++ b/lib/common/tests/acl/xml_acl_enabled_test.c
@@ -0,0 +1,72 @@
+/*
+ * Copyright 2020-2021 the Pacemaker project contributors
+ *
+ * The version control history for this file may have further details.
+ *
+ * This source code is licensed under the GNU Lesser General Public License
+ * version 2.1 or later (LGPLv2.1+) WITHOUT ANY WARRANTY.
+ */
+
+#include <crm_internal.h>
+#include <crm/common/acl.h>
+#include "../../crmcommon_private.h"
+
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <setjmp.h>
+#include <cmocka.h>
+
+static void
+is_xml_acl_enabled_without_node(void **state)
+{
+    xmlNode *test_xml = create_xml_node(NULL, "test_xml");
+    assert_false(xml_acl_enabled(test_xml));
+
+    test_xml->doc->_private = NULL;
+    assert_false(xml_acl_enabled(test_xml));
+
+    test_xml->doc = NULL;
+    assert_false(xml_acl_enabled(test_xml));
+
+    test_xml = NULL;
+    assert_false(xml_acl_enabled(test_xml));
+}
+
+static void
+is_xml_acl_enabled_with_node(void **state)
+{
+    xml_private_t *p;
+    
+    xmlNode *test_xml = create_xml_node(NULL, "test_xml");
+
+    // allocate memory for _private, which is NULL by default
+    test_xml->doc->_private = calloc(1, sizeof(xml_private_t));
+
+    assert_false(xml_acl_enabled(test_xml));
+
+    // cast _private from void* to xml_private_t*
+    p = test_xml->doc->_private;
+
+    // enable an irrelevant flag
+    p->flags |= pcmk__xf_acl_denied;
+
+    assert_false(xml_acl_enabled(test_xml));
+
+    // enable pcmk__xf_acl_enabled
+    p->flags |= pcmk__xf_acl_enabled;
+
+    assert_true(xml_acl_enabled(test_xml));
+}
+
+int
+main(int argc, char **argv)
+{
+    const struct CMUnitTest tests[] = {
+        cmocka_unit_test(is_xml_acl_enabled_without_node),
+        cmocka_unit_test(is_xml_acl_enabled_with_node),
+    };
+
+    cmocka_set_message_output(CM_OUTPUT_TAP);
+    return cmocka_run_group_tests(tests, NULL, NULL);
+}