Explain better why the output file no longer defines 'const', and
explain what to do about it if this still matters to you.
diff --git a/NEWS b/NEWS
index 108f5c6..af7d37d 100644
--- a/NEWS
+++ b/NEWS
@@ -16,7 +16,10 @@
Changes in version 1.29:
-* Output file does not redefine const; that is now config.h's job.
+* The output file does not define const, as this caused problems when used
+ with common autoconfiguration schemes. If you still use ancient compilers
+ that lack const, compile with the equivalent of the C compiler option
+ `-Dconst='. autoconf's AC_C_CONST macro provides one way to do this.
* Added `-g' and `--graph'.
