Hey, this a new engine that's growing in popularity. There are actually 2 ebuilds (one for the engine and one for the themes, but I'm submitting them as one). These ebuilds don't currently use the gtk-engines eclass. There's a bit of trickery needed because it builds both gtk1 and gtk2 versions from the same source. Reproducible: Always Steps to Reproduce: 1. 2. 3.
Created attachment 10878 [details] gtk-smooth-engine-0.5.2.ebuild
Created attachment 10879 [details] smooth-themes-0.5.2.ebuild
*** This bug has been marked as a duplicate of 19718 ***