From 5e8f666c2abfbf455a284b54750dad19f97fe5fe Mon Sep 17 00:00:00 2001
From: Florian Forster <ff@octo.it>
Date: Fri, 5 May 2017 14:43:29 +0200
Subject: [PATCH] configure: Check if PKG_INSTALLDIR is defined before using
 it.

---
 configure.ac | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 60138fc..fcafad1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -50,7 +50,8 @@ AC_ARG_VAR(PERL, [Perl interpreter command])
 LT_INIT([dlopen])
 
 # pkg-config interface
-PKG_INSTALLDIR
+# PKG_INSTALLDIR is only available for pkg-config >= 0.27
+m4_ifdef([PKG_INSTALLDIR], [PKG_INSTALLDIR], [])
 
 AC_ARG_WITH(pkgconfigdir,
 	    AC_HELP_STRING([--with-pkgconfigdir], [Use the specified pkgconfig dir (default is libdir/pkgconfig)]),
-- 
2.30.2