diff --git a/ANNOUNCE b/ANNOUNCE
index 91bad57f2..e5c9a224e 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -1,5 +1,5 @@
 
-Libpng 1.6.0beta27 - July 14, 2012
+Libpng 1.6.0beta27 - July 21, 2012
 
 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.
@@ -399,7 +399,8 @@ Version 1.6.0beta26 [July 10, 2012]
   Moved scripts/chkfmt to contrib/tools.
   Changed "a+w" to "u+w" in Makefile.in to fix CVE-2012-3386.
 
-Version 1.6.0beta27 [July 14, 2012]
+Version 1.6.0beta27 [July 21, 2012]
+  Do not use __restrict when GNUC is <= 3.1
 
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diff --git a/CHANGES b/CHANGES
index b5c569b12..456d22d44 100644
--- a/CHANGES
+++ b/CHANGES
@@ -4150,7 +4150,9 @@ Version 1.6.0beta26 [July 10, 2012]
   Moved scripts/chkfmt to contrib/tools.
   Changed "a+w" to "u+w" in Makefile.in to fix CVE-2012-3386.
 
-Version 1.6.0beta27 [July 14, 2012]
+Version 1.6.0beta27 [July 21, 2012]
+  Do not compile PNG_DEPRECATED, PNG_ALLOC and PNG_PRIVATE when __GNUC__ < 3.
+  Do not use __restrict when GNUC is <= 3.1
 
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diff --git a/pngconf.h b/pngconf.h
index 694f089b6..46e997aa3 100644
--- a/pngconf.h
+++ b/pngconf.h
@@ -1,7 +1,7 @@
 
 /* pngconf.h - machine configurable file for libpng
  *
- * libpng version 1.6.0beta27 - July 14, 2012
+ * libpng version 1.6.0beta27 - July 21, 2012
  *
  * Copyright (c) 1998-2012 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -366,24 +366,28 @@
 #    ifndef PNG_NORETURN
 #      define PNG_NORETURN   __attribute__((__noreturn__))
 #    endif
-#    ifndef PNG_ALLOCATED
-#      define PNG_ALLOCATED  __attribute__((__malloc__))
-#    endif
-#    ifndef PNG_DEPRECATED
-#      define PNG_DEPRECATED __attribute__((__deprecated__))
-#    endif
-#    ifndef PNG_PRIVATE
-#      if 0 /* Doesn't work so we use deprecated instead*/
-#        define PNG_PRIVATE \
-          __attribute__((warning("This function is not exported by libpng.")))
-#      else
-#        define PNG_PRIVATE \
-          __attribute__((__deprecated__))
+#    if __GNUC__ >= 3
+#      ifndef PNG_ALLOCATED
+#        define PNG_ALLOCATED  __attribute__((__malloc__))
 #      endif
-#    endif
-#    ifndef PNG_RESTRICT
-#      define PNG_RESTRICT __restrict
-#    endif
+#      ifndef PNG_DEPRECATED
+#        define PNG_DEPRECATED __attribute__((__deprecated__))
+#      endif
+#      ifndef PNG_PRIVATE
+#        if 0 /* Doesn't work so we use deprecated instead*/
+#          define PNG_PRIVATE \
+            __attribute__((warning("This function is not exported by libpng.")))
+#        else
+#          define PNG_PRIVATE \
+            __attribute__((__deprecated__))
+#        endif
+#      endif
+#      if ((__GNUC__ != 3) || (__GNUC_MINOR__ >= 1))
+#        ifndef PNG_RESTRICT
+#          define PNG_RESTRICT __restrict
+#        endif
+#      endif /*  __GNUC__ == 3.0 */
+#    endif /*  __GNUC__ >= 3 */
 
 #  elif defined(_MSC_VER)  && (_MSC_VER >= 1300)
 #    ifndef PNG_USE_RESULT