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diff --git a/ChangeLog b/ChangeLog
index dd63aa0812b..648017a6dd1 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,7 @@
 2014-05-02  Glenn Morris  <rgm@gnu.org>
 
+        * configure.ac (PKG_CONFIG_PATH): Declare with AC_ARG_VAR.
+
         * configure.ac (--with-pkg-config-prog): Remove.
         Use the PKG_CONFIG environment variable instead if you need it.