patch 8.0.0082
Problem:    Extension for configure should be ".ac".
Solution:   Rename configure.in to configure.ac. (James McCoy, closes #1173)
diff --git a/src/config.h.in b/src/config.h.in
index 62427e2..5baac7d 100644
--- a/src/config.h.in
+++ b/src/config.h.in
@@ -1,6 +1,6 @@
 /*
- * config.h.in.  Generated automatically from configure.in by autoheader, and
- * manually changed after that.
+ * config.h.in.  Originally generated automatically from configure.ac by
+ * autoheader and manually changed after that.
  */
 
 /* Define if we have EBCDIC code */