Re: [Inkscape-devel] non-Unicode symbol fonts do not work on Windows. Bug 165665. Do we need the flag USE_PANGO_WIN32 ?

no, it would mean that on the Windows platform you would have access to new vector-based .ttf fonts that were previously not available. Some background info is at the bug report:

https://bugs.launchpad.net/inkscape/+bug/165665