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Date: Sun, 26 Oct 2014 20:47:28 +0200
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Subject: Re: [gentoo-user] emerge world problem with one package
From: Alexander Kapshuk <alexander.kapshuk@gmail.com>
To: Gentoo mailing list <gentoo-user@lists.gentoo.org>
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On Sun, Oct 26, 2014 at 5:58 PM, Jacques Montier <jmontier@gmail.com> wrote:
> [ebuild  rR   ~] media-gfx/hugin-2014.0.0-r1  USE="python -debug -lapack
> -sift" LINGUAS="fr -cs -da -de -en_GB -es -eu -fi -hu -it -ja -nl -pl -pt_BR
> -ro -ru -sk -sv -zh_CN -zh_TW" PYTHON_SINGLE_TARGET="python2_7 (-python3_2)
> -python3_3 -python3_4" PYTHON_TARGETS="python2_7 python3_3 (-python3_2)
> -python3_4" 0 kB
>
> I don't have any PYTHON_SINGLE_TARGET and PYTHON_TARGETS lines in make.conf.

Those are defined in your system profile:
grep -i '^python_[st].*' /usr/portage/profiles/base/make.defaults
PYTHON_TARGETS="python2_7 python3_3"
PYTHON_SINGLE_TARGET="python2_7"

See if this helps, http://forums.gentoo.org/viewtopic-t-949306.html.