From mboxrd@z Thu Jan  1 00:00:00 1970
From: Federico Beffa <beffa@ieee.org>
Subject: Re: matplotlib broken
Date: Tue, 16 Jun 2015 08:51:08 +0200
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To: =?UTF-8?Q?Ludovic_Court=C3=A8s?= <ludo@gnu.org>
Cc: Guix-devel <guix-devel@gnu.org>

ludo@gnu.org (Ludovic Court=C3=A8s) writes:

> I don=E2=80=99t know if I=E2=80=99m missing something, but when I type =
=E2=80=98matplotlib=E2=80=99 at
> the prompt, I get:
>
> /gnu/store/g4m8q73cq4lym3v1ag7pnk5zv49mdifs-python-matplotlib-1.4.2/lib/p=
ython3.4/site-packages/matplotlib-1.4.2-py3.4-linux-x86_64.egg/matplotlib/b=
ackends/backend_gtk3.py in <module>()
>      19 except ValueError:
>      20     raise ImportError(
> ---> 21         "Gtk3 backend requires the GObject introspection bindings=
 for Gtk 3 "
>      22         "to be installed.")
>      23
>
> ImportError: Gtk3 backend requires the GObject introspection bindings for=
 Gtk 3 to be installed.
>
> This may well be related to <http://bugs.gnu.org/20765>: Because Guix
> has incomplete dependency information, it might GC some of the things
> that these eggs refer to, and so things may or may not work depending on
> whether they have been GC=E2=80=99d.

To solve this error I think you need to set
export GI_TYPELIB_PATH=3D"$HOME/.guix-profile/lib/girepository-1.0"
We should probably add a search path specification for that.

For me it does display a window as expected, but it doesn't show the
curve (line in this case).

Thanks.
Fede