Is it possible to consider to add the patch described and downloadable
here to extract individual files or folders from an archive:
http://www.fsarchiver.org/forums/viewtopic.php?f=13&t=1631

I tested the patch on the official source release
fsarchiver-0.6.19.tar.gz and it compiled perfectly not a warning during
compilation.
I even tested the patch functionality on an archive and it worked correctly.