When investigating https://bugs.kde.org/show_bug.cgi?id=310499, I find the cause is there is no plasma-overlay binary on my Gentoo system. That is clearly a bug of the 9999 ebuild, because I just build it manually and now have plasma-overlay in my system. The same problem probably also exists for 4.9.80. Reproducible: Always
Created attachment 330928 [details] build log
should be related with "plasma/screensaver/shell/" within KMEXTRACTONLY in the ebuild, since the plasma-overlay is built from that subfolder.
Created attachment 334430 [details, diff] A simple patch to make it build and install plasma-overlay Please double check. I'm still not familiar with kde ebuilds.
Should be fixed in the overlay now.