diff --git a/ANNOUNCE b/ANNOUNCE
index 704eb92c2..806ead999 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -1,5 +1,5 @@
 
-Libpng 1.4.6beta06 - March 8, 2011
+Libpng 1.4.6beta06 - March 14, 2011
 
 This is not intended to be a public release.  It will be replaced
 within a few weeks by a public version or by another test version.
@@ -49,9 +49,9 @@ version 1.4.6beta05 [January 23, 2011]
   Fixed a typo in the *.def files and deleted entries that are now
     declared in pngpriv.h
 
-version 1.4.6beta06 [March 8, 2011]
+version 1.4.6beta06 [March 14, 2011]
   Updated contrib/pngsuite/README to add the word "modify".
-  Added the private PNG_UNUSED() macro definition in pngpriv.h.
+  Added the private PNG_UNUSED() macro definition in pngconf.h.
 
 Send comments/corrections/commendations to glennrp at users.sourceforge.net
 or to png-mng-implement at lists.sf.net (subscription required; visit
diff --git a/CHANGES b/CHANGES
index c60235c60..854e32c1a 100644
--- a/CHANGES
+++ b/CHANGES
@@ -2761,9 +2761,9 @@ version 1.4.6beta05 [January 23, 2011]
   Fixed a typo in the *.def files and deleted entries that are now
     declared in pngpriv.h
 
-version 1.4.6beta06 [March 8, 2011]
+version 1.4.6beta06 [March 14, 2011]
   Updated contrib/pngsuite/README to add the word "modify".
-  Added the private PNG_UNUSED() macro definition in pngpriv.h.
+  Added the private PNG_UNUSED() macro definition in pngconf.h.
 
 Send comments/corrections/commendations to glennrp at users.sourceforge.net
 or to png-mng-implement at lists.sf.net (subscription required; visit
diff --git a/pngconf.h b/pngconf.h
index 2040ecad6..cf9f78a49 100644
--- a/pngconf.h
+++ b/pngconf.h
@@ -1,7 +1,7 @@
 
 /* pngconf.h - machine configurable file for libpng
  *
- * libpng version 1.4.6beta06 - January 23, 2011
+ * libpng version 1.4.6beta06 - March 14, 2011
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998-2011 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -84,6 +84,18 @@
 
 /* End of material added to libpng-1.2.8 */
 
+/* Added at libpng-1.4.6 */
+#ifndef PNG_UNUSED
+/* Unused formal parameter warnings are silenced using the following macro
+ * which is expected to have no bad effects on performance (optimizing
+ * compilers will probably remove it entirely).  Note that if you replace
+ * it with something other than whitespace, you must include the terminating
+ * semicolon.
+ */
+#  define PNG_UNUSED(param) (void)param;
+#endif
+/* End of material added to libpng-1.4.6 */
+
 #ifndef PNG_VERSION_INFO_ONLY
 
 /* This is the size of the compression buffer, and thus the size of