diff --git a/acinclude.m4 b/acinclude.m4
index ecaa1dde6e..98ab8c6acd 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -1,25 +1,51 @@
 dnl
 dnl local autoconf/automake macros for pacemaker
 dnl
 
 dnl Check if the flag is supported by linker (cacheable)
 dnl CC_CHECK_LDFLAGS([FLAG], [ACTION-IF-FOUND],[ACTION-IF-NOT-FOUND])
 dnl
 dnl Origin (declared license: GPLv2+ with less restrictive exception):
 dnl https://git.gnome.org/browse/glib/tree/m4macros/attributes.m4?h=2.49.1
 dnl (AC_LANG_PROGRAM substituted by Jan Pokorny <jpokorny@redhat.com>)
 
 AC_DEFUN([CC_CHECK_LDFLAGS], [
   AC_CACHE_CHECK([if $CC supports $1 flag],
     AS_TR_SH([cc_cv_ldflags_$1]),
     [ac_save_LDFLAGS="$LDFLAGS"
      LDFLAGS="$LDFLAGS $1"
      AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], [[]])],
        [eval "AS_TR_SH([cc_cv_ldflags_$1])='yes'"],
        [eval "AS_TR_SH([cc_cv_ldflags_$1])="])
      LDFLAGS="$ac_save_LDFLAGS"
     ])
 
   AS_IF([eval test x$]AS_TR_SH([cc_cv_ldflags_$1])[ = xyes],
     [$2], [$3])
 ])
+
+
+dnl PKG_CHECK_VAR(VARIABLE, MODULE, CONFIG-VARIABLE,
+dnl [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
+dnl -------------------------------------------
+dnl Since: 0.28
+dnl
+dnl Retrieves the value of the pkg-config variable for the given module.
+dnl
+dnl Origin (declared license: GPLv2+ with less restrictive exception):
+dnl https://cgit.freedesktop.org/pkg-config/tree/pkg.m4.in?h=pkg-config-0.29.1#n261
+dnl (AS_VAR_COPY replaced with backward-compatible equivalent and guard
+dnl to prefer system-wide variant by Jan Pokorny <jpokorny@redhat.com>)
+
+m4_ifndef([PKG_CHECK_VAR],[
+AC_DEFUN([PKG_CHECK_VAR],
+[AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
+AC_ARG_VAR([$1], [value of $3 for $2, overriding pkg-config])dnl
+
+_PKG_CONFIG([$1], [variable="][$3]["], [$2])
+dnl AS_VAR_COPY([$1], [pkg_cv_][$1])
+$1=AS_VAR_GET([pkg_cv_][$1])
+
+AS_VAR_IF([$1], [""], [$5], [$4])dnl
+])dnl PKG_CHECK_VAR
+])dnl m4_ifndef