emergine plasma-meta broke at plasma-workspace-wallpapers plasma-workspace-wallpapers broke when configuring. changing to cmake 3.4 solved the problem having cmake 3.3 should bloxk i guess...
Please include the portage output.
From CMakeLists.txt: cmake_minimum_required(VERSION 2.8.12 FATAL_ERROR)
I tried to reproduce by chrooting and unpacking stage3 etc, but I could not. I have set the package.accept_keywords more wide this time, but I cannot remember the original settings.