bug#25035: scribus: No module named _sysconfigdata_nd

[Adonay Felipe Nogueira <adfeno@openmailbox.org>]

This bug still exists if one installs Scribus through Guix in a foreign
system distribution. Even though I still have both LD_LIBRARY_PATH and
PYTHONPATH variables unset and I don't have Python installed through
Guix.

However, today I decided to test with:

$ guix environment --ad-hoc scribus python@2.7 bash -- bash

And after the environment was set, I did:

$ echo $PATH
/gnu/store/1cvfwh7qj6c2vgkbancql9phrm64dh9d-profile/bin:/home/adfeno/.guix-profile/bin:/home/adfeno/.guix-profile/sbin:/home/adfeno/.guix-profile/bin:/home/adfeno/.guix-profile/sbin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games
$ echo $PYTHONPATH
/gnu/store/1cvfwh7qj6c2vgkbancql9phrm64dh9d-profile/lib/python2.7/site-packages
$ echo $LD_LIBRARY_PATH

$ scribus

And then Scribus lauched (although with errors about missing images
which I'll ignore for this bug).

One way out of this bug would be to investigate/fix the hardcoded paths
that Scribus might have according to what ludo said
([[http://lists.gnu.org/archive/html/bug-guix/2016-11/msg00077.html]]).

Other possibility is to test moving the Python dependency from the
package's inputs to native-inputs or propagated-inputs. But this is just
an idea from a non-developer (me), so I don't know if this is really the
cause of the problem.

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