See http://koji.rpmfusion.org/koji/taskinfo?taskID=260549

The build failed, but there's no clear indication why (or I'm not seeing it). Doesn't appear to be related to the package source, it never got as far as trying to compile that.

Although it says "see build.log for more information", build.log contains only two lines:

Mock Version: 1.4.8
Mock Version: 1.4.8