Comment 2 for bug 165761

It looks like things may be getting installed to some incorrect places.
Everything in share (including the extensions) gets installed to

    /usr/local/share/inkscape/

That is the standard location that Inkscape should be loading its
extensions from, *not* /usr/local/lib/inkscape nor /usr/lib/inkscape.
Whatever code is putting stuff in those dirs should be deactivated.