From mboxrd@z Thu Jan  1 00:00:00 1970
From: Danny Milosavljevic <dannym@scratchpost.org>
Subject: Re: Guile 2.2 packages
Date: Thu, 8 Sep 2016 00:13:06 +0200
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To: Ludovic =?ISO-8859-1?Q?Court=E8s?= <ludo@gnu.org>
Cc: guix-devel <guix-devel@gnu.org>

On Wed, 7 Sep 2016 23:15:22 +0200
Danny Milosavljevic <dannym@scratchpost.org> wrote:

>    export PATH="foo/bin${PATH:+:}$PATH"
>    export GUILE_LOAD_PATH="foo/share/guile/site/2.0${GUILE_LOAD_PATH:+:}$GUILE_LOAD_PATH"
>    export GUILE_LOAD_COMPILED_PATH="foo/lib/guile/2.0/ccache:foo/share/guile/site/2.0${GUILE_LOAD_COMPILED_PATH:+:}$GUILE_LOAD_COMPILED_PATH"
>    export GUILE_LOAD_PATH="foo/share/guile/site/2.2${GUILE_LOAD_PATH:+:}$GUILE_LOAD_PATH"
>    export GUILE_LOAD_COMPILED_PATH="foo/lib/guile/2.2/ccache:foo/share/guile/site/2.2${GUILE_LOAD_COMPILED_PATH:+:}$GUILE_LOAD_COMPILED_PATH"

Hmm... or not really overwriting them. So it should work?