# HG changeset patch
# User Jim Meyering <jim@meyering.net>
# Date 960020973 0
# Node ID 0ec2f09e5139a67330b02d5add1746fb4e3e5e3c
# Parent  2e46a130ed00e4457261f13518323107d1d5e29c
Add comment to AC_DEFINE_UNQUOTED use.

diff --git a/m4/glibc21.m4 b/m4/glibc21.m4
--- a/m4/glibc21.m4
+++ b/m4/glibc21.m4
@@ -20,6 +20,7 @@
 	ac_cv_gnu_library_2_1=no)
       ]
     )
-    AC_DEFINE_UNQUOTED(GLIBC21,$ac_cv_gnu_library_2_1)
+    AC_DEFINE_UNQUOTED(GLIBC21, $ac_cv_gnu_library_2_1,
+                       [we use GNU C Library 2.1 or newer])
   ]
 )