Because wma USE counter-intuitively pulls ffmpeg, which enables cmus to play almost any format without need for any other library. Reproducible: Always
commit 2632c5199d8d2de43051f09f0dbfac46c0361cdf Author: Sergey Popov <pinkbyte@gentoo.org> Date: Wed Jul 20 11:14:54 2016 +0300 media-sound/cmus: rename USE 'wma' to USE 'ffmpeg' Reported-by: xpue <r9ku1q@gmail.com> Gentoo-Bug: 553834 Package-Manager: portage-2.2.28
Please test your commits in the future. It is not a good look when QA introduces "fixes" like this that break stable ebuilds.