> My guess is that matplotlib was built without the gui. I build Sage
> from source and in that case it is necessary to set an environment
> variable. For example in bash: export SAGE_MATPLOTLIB_GUI='yes'. This
> then will tell it to try to build a gui. It does require that the
> needed devel packages are present. Matplotlib can use several such as
> Tk, Qt, Gtk.
>
> Adam

Hello Adam,
thanks very much for that, will it try to built every possible backend
or do I need to set an additional Variable?
emil

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