From mboxrd@z Thu Jan  1 00:00:00 1970
From: Danny Milosavljevic <dannym@scratchpost.org>
Subject: Re: [PATCH] gnu: Add LDFLAGS=-lpthread to configure-flags where
	needed.
Date: Tue, 21 Mar 2017 19:52:07 +0100
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To: John Darrington <john@darrington.wattle.id.au>
Cc: guix-devel@gnu.org

Hi,

I forgot to say: gcc pthread mode is activated via option "-pthread".

It enables thread-local storage for some things (errno etc) and uses reentrant versions of some functions.

Which packages are the ones that is depending on libpng and failing?  I can have a look...