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Date: Fri, 29 Mar 2013 08:30:50 +0200
From: Samuli Suominen <ssuominen@gentoo.org>
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Subject: [gentoo-dev] Minor change in pkg-config behavior, starting with 0.28, late heads
 up for maintainers
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This is from Fedora Devel Mailing List. I found it to be news worthy 
also for Gentoo maintainers. So here it is:

<snip>

Remi Collet Fedora at FamilleCollet.com
Thu Mar 28 10:39:52 UTC 2013

Previous versions

$ echo "==$(pkg-config --cflags-only-I openssl)=="
== ==

New version
$ echo "==$(pkg-config --cflags-only-I openssl)=="
====

This space to empty string output can breaks some poorly written
autoconf script.



Remi.


P.S.1: 	I hope it could helps some packager...
	avoid losing too much time on this...
P.S.2:	example of broken script
	http://git.php.net/?p=php-src.git;a=commitdiff;h=640e72ce91d8e591b92cd93c18d1bfe3befe3424

</snip>