Comment 7 for bug 1645066

I included pyserial in the devlibs now (see [1] and [2]).

It's already landed in the Inkscape 0.92pre4 release if you want to test. (I don't have a plotter to do that ;-) )

[1] http://bazaar.launchpad.net/~inkscape.dev/inkscape-devlibs/trunk/revision/66
[2] http://bazaar.launchpad.net/~inkscape.dev/inkscape-devlibs64/trunk/revision/35
[3] https://inkscape.org/download/development-versions/