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bug#26009: libpng-apng

From: Ludovic Courtès
Subject: bug#26009: libpng-apng
Date: Mon, 13 Mar 2017 14:07:03 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1 (gnu/linux)

Kei Kebreau <address@hidden> skribis:

> For whatever reason, I can't get Guix to recognize libpng-apng as a
> package seperate from libpng (i.e. "guix build libpng-apng" returns a
> vanilla libpng directory). Do you have any idea why this is?

This is because libpng in current master has a ‘replacement’ field, and
since libpng-apng inherits from libpng, it also gets that replacement.

The fix is to write:

  (define-public libpng-apng
       (inherit libpng)
       (replacement #f)   ;libpng’s replacement doesn’t apply here

That said, please make sure the security issues fixed in ‘libpng/fixed’
are also fixed in libpng-apng!


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