sane-frontends 1.0.12 now supports gimp 1.2 & 2.0, so the ebuild has to be adopted to create apropriate links for the plugin Reproducible: Always Steps to Reproduce: 1. 2. 3.
Thanks for the hint, done. With 1.0.12 you will have to set the USE flag "gimp" to get the plugin. It will be built for the latest GIMP version you have installed.