void-packages/srcpkgs/python3-matplotlib/files
..
README.voidlinux

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By default, this package supports only non-interactive graphics output.
For interactive graphics, install:

- gtk+3 gir-freedesktop python3-gobject python3-cairocffi
  (for GTK3Agg/GTK3Cairo backend)
- python3-PyQt5 (for Qt5Agg backend)
- python3-tkinter (for TkAgg backend)
- python3-tornado (for webagg backend)

The backend can be defined in $XDG_CONFIG_HOME/matplotlib/matplotlibrc

Natively, matplotlib only supports PNG images. Install python3-Pillow
to support more file formats.

Matplotlibs LaTeX support requires a working LaTeX installation and
ghostscript.