emerge '=net-libs/farsight2-0.0.31' fails if gst-python-0.10* isn't installed. I think it is the same issue as reported in Bug 507332 for net-libs/farstream-0.1.2-r1 Reproducible: Always
Created attachment 382990 [details] emerge --info net-libs/farsight2
Created attachment 382992 [details] build log
did you try rebuilding gst-python ?