Okay, this is the list after the SECOND emptytree world. I then sync'd again and removed any packages scheduled for update from this list and ran it again.
Most of these are long-standing fails, the one that worries me the most is klibc, that might byte me on reboot. That is a Gcc 5.3 incompatibility! tortoise portage # tree -L 2 . ├── app-cdr │ └── cdrdao-1.2.3-r2 ├── app-office │ └── texmacs-1.99.2-r1 ├── app-text │ └── recode-3.6_p20-r1 ├── dev-dotnet │ ├── gnome-sharp-2.24.2-r1 │ ├── gtk-sharp-2.12.21 │ ├── nuget-2.8.3 │ └── xdt-for-monodevelop-2.8.1 ├── dev-java │ └── java-sdk-docs-1.8.0.66 ├── dev-libs │ ├── klibc-2.0.4 │ ├── libcdio-0.93 │ └── libcdio-paranoia-0.93_p1 ├── dev-util │ └── monodevelop-5.9.5.9 ├── kde-base │ └── pykde4-4.14.3 ├── media-gfx │ ├── gphotofs-0.5 │ └── povray-3.7.0.0 ├── media-libs │ ├── opencv-3.0.0 │ └── x264-0.0.20151011 ├── media-sound │ ├── audacity-2.0.5-r1 │ └── playmidi-2.5-r2 ├── media-video │ └── vcdimager-0.7.24 ├── sys-fs │ └── squashfs-tools-4.3 └── www-servers └── xsp-2014.12-r2014120900 36 directories, 0 files tortoise portage # -- IQ is a measure of how stupid you feel. Powers are not rights.