ePub Thumbnails in Dolphin

So I was struck with a desire to see thumbnails of my epub book covers, as one often is, so I tried to install the necessary bits into Dolphin. I gathered this required installing kde-thumbnailer-epub, but when I tried to yaourt it tried to build it from the AUR and this happened:

CMake Error: The source directory "/tmp/yaourt-tmp-tenjin/aur-kde-thumbnailer-epub/src/kde-thumbnailer-epub-1.1" does not appear to contain CMakeLists.txt.

This raises two questions that I was wondering if anyone could shed some light on, if only to satisfy my curiosity. 1. Why isn’t this package in our Extra repository? 2. What caused the make error–is it just a bad packagebuild?

Sorry if these are dumb questions–I’m still pretty new to the platform, and comp sci isn’t my field by any means.

A: kde-thumbnailer-epub is not an official Plasma Package
B: yes, it looks to be a bad PKGBUILD file.

Thanks, that explains it.