Musescore 2.0 for gentoo
Ebuild is still missing. I managed to install ms 2.0 as follows:
Install qt5. Add to /etc/portage/package.accept_keywords dev-qt/*
Then emerge --sync
emerge -uDNavt @world
If it asks to rebuild packages, agree. You may need to resolve dependencies which is usually solved by removing the mentioned blocking packs.
It will update your OS and install qt5.
Then download the offered zip file, unzip it and read README file for instructions. The executable of MS used in this pack was compiled by a kxstudio developer for ubuntu with static libs but works on gentoo. I just needed to install additional libs. That's what the pack for. It helps to install additional libs.
Link to zip file: http://rghost.net/download/6r42v7MMC/4c707865278bc03949430c0ff4efd704df…
By the way, the pack should work on any linux, not only gentoo.