PYTHON_TARGETS="python3_6" emerge -p mpv ... The following REQUIRED_USE flag constraints are unsatisfied: any-of ( python_targets_python2_7 python_targets_python3_4 python_targets_python3_5 ) Nothing in the source code prevents usage of python 3.6
commit a75769ed663dc642f763708cf38a9896f03df31d Author: Ilya Tumaykin <itumaykin@gmail.com> AuthorDate: Sun Dec 3 23:15:27 2017 +0300 Commit: Michael Palimaka <kensington@gentoo.org> CommitDate: Wed Dec 6 23:14:09 2017 +1100 media-video/mpv: add support for Python 3.6 Closes: https://github.com/gentoo/gentoo/pull/6430 Package-Manager: Portage-2.3.16, Repoman-2.3.6