media-libs/gstreamer:0.10 is wanting a treeclean, and subsequently, so is dev-perl/GStreamer and dev-perl/GStreamer-Interfaces All support for GStreamer <1 will need to be eradicated from gmusicbrowser to make this happen.
Should I rev-bump for this?
If it's not a huge build time, I think that'd be safer bet to revbump indeed, to ensure everyone actually gets off of gstreamer:0.10 usage.
https://github.com/gentoo/gentoo/pull/3955
commit 390545adff45dcbe3404c2a3922dccaa3fa74ade Author: Sergiy Borodych <Sergiy.Borodych@gmail.com> Date: Mon Feb 13 17:49:22 2017 +0200 media-sound/gmusicbrowser: drop gstreamer-0 support close bug #604684