On Tue, Aug 01, 2017 at 03:47:08PM +0000, ng0 wrote:
> From 4326cad38700df43909eb6f430217fdfa4eca89f Mon Sep 17 00:00:00 2001
> From: ng0 <ng0@infotropique.org>
> Date: Tue, 1 Aug 2017 15:37:28 +0000
> Subject: [PATCH] gnu: libpng-apng: Update to 1.6.28.
> 
> Fixes <https://bugs.gnu.org/27556>.
> 
> * gnu/packages/image.scm (libpng-apng): Update to 1.6.28.
> Remove inherit of 'libpng'.
> (version): Use own version, remove 'package-version libpng'.
> (source): Add it.
> (arguments): Update hash of libpng-apng source.

Thanks! Pushed as e0958c2df833a5eb3b6ecfb66f8d971cd44dd49b