Installing inkscape fails due to missing ebuild.
Reproduce by :
emerge media-gfx/inkscape
Output
emerge media-gfx/inkscape These are the packages that would be merged, in order: Calculating dependencies... done! emerge: there are no ebuilds to satisfy ">=dev-cpp/gtkmm-2.18.0:2.4". (dependency required by "media-gfx/inkscape-0.92.3-r1::media-kit" [ebuild]) (dependency required by "inkscape" [argument])