From: Glenn Morris <rgm@gnu.org>
Date: Tue, 6 May 2014 20:36:40 +0000 (-0400)
Subject: * configure.ac: Comment.
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* configure.ac: Comment.
---

diff --git a/configure.ac b/configure.ac
index 1381f3669dd..d398e31f89e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -84,6 +84,7 @@ AC_CONFIG_HEADERS(src/config.h:src/config.in)
 AC_CONFIG_SRCDIR(src/lisp.h)
 AC_CONFIG_AUX_DIR(build-aux)
 dnl automake 1.13 and later understand this, making -I m4 unnecessary.
+dnl With older versions this is a no-op.
 AC_CONFIG_MACRO_DIR(m4)
 
 xcsdkdir=