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Sage is looking for those bindings installed in Sage's copy of python. You can install things in Sage's copy of python by doing "sage -sh" and then whatever you normally would do to install the python bindings.

For Sage's matplotlib, the graphical guis are also turned off by default. Define the environment variable:

export SAGE_MATPLOTLIB_GUI=yes

and then reinstall Sage's matplotlib:

sage -i matplotlib

to compile support for other backends in Sage.