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Date: Tue, 12 Mar 2013 15:55:06 +0100
From: Helmut Jarausch <jarausch@igpm.rwth-aachen.de>
Subject: [gentoo-user] PYTHON_SINGLE_TARGET
To: Gentoo User Mailing List <gentoo-user@lists.gentoo.org>
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Hi,

suddenly emerging some packages like app-office/libreoffice or
media-gfx/blender fail due to

No Python implementation selected for the build. Please set
  * the PYTHON_SINGLE_TARGET variable in your make.conf to one
  * of the following values:
  *
  * python2_7 python3_3


but in /etc/portage/make.conf  (there is no /etc/make.conf anymore)
I have


USE_PYTHON="2.7 3.3"
PYTHON_TARGETS="python2_7 python3_3"
PYTHON_SINGLE_TARGET="python3_3"


What am I missing?

Many thanks for a hint,
Helmut.