From 74180f2a57a7b5dba45337dc79f411eaf4fada0f Mon Sep 17 00:00:00 2001
From: Jakub Hrozek <jhrozek@redhat.com>
Date: Tue, 11 Oct 2016 12:08:06 +0200
Subject: [PATCH 11/12] BUILD: Add a private copy of a pkg-config build macro

---
 src/build_macros.m4 |  7 +++++++
 src/external/pkg.m4 | 14 ++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/src/build_macros.m4 b/src/build_macros.m4
index 92d7c65d1a073416b8f1c2ef43a7a827feae6629..ec704acfda754e72163b6ac9d20650b5dd90ac69 100644
--- a/src/build_macros.m4
+++ b/src/build_macros.m4
@@ -48,3 +48,10 @@ AC_DEFUN([SSS_AC_EXPAND_LIB_DIR],
     ])
     sss_extra_libdir="$additional_libdir"
 ])
+
+dnl A backwards-compatible way of declaring AS_VAR_COPY
+dnl for example for CentOS-6
+m4_ifndef([AS_VAR_COPY],
+[m4_define([AS_VAR_COPY],
+[AS_LITERAL_IF([$1[]$2], [$1=$$2], [eval $1=\$$2])])])
+
diff --git a/src/external/pkg.m4 b/src/external/pkg.m4
index 568127f104de92fc81fa9b9ccf2fbd2d470840a1..edba30cdd0cf59654096e1768595351b9975ea68 100644
--- a/src/external/pkg.m4
+++ b/src/external/pkg.m4
@@ -154,3 +154,17 @@ else
 	ifelse([$3], , :, [$3])
 fi[]dnl
 ])# PKG_CHECK_MODULES
+
+dnl PKG_CHECK_VAR(VARIABLE, MODULE, CONFIG-VARIABLE,
+dnl [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
+dnl -------------------------------------------
+dnl Retrieves the value of the pkg-config variable for the given module.
+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])
+AS_VAR_COPY([$1], [pkg_cv_][$1])
+
+AS_VAR_IF([$1], [""], [$5], [$4])dnl
+])dnl PKG_CHECK_VAR
-- 
2.7.4