cinnamon-killer-daemon python script from gnome-extra/cinnamon package uses Keybinder via the GObject Introspection and therefore requires dev-libs/keybinder[introspection] as a dependency. See https://github.com/linuxmint/Cinnamon/blob/master/files/usr/bin/cinnamon-killer-daemon#L11 for details.
Created attachment 547058 [details, diff] gnome-extra/cinnamon-3.6.6-r2.ebuild to require dev-libs/keybinder:3[introspection]
Created attachment 547060 [details, diff] gnome-extra/cinnamon-3.8.8.ebuild to require dev-libs/keybinder:3[introspection]
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=999d64da43c7547c07e76226e7ded7fd3568e302 commit 999d64da43c7547c07e76226e7ded7fd3568e302 Author: Kristian Fiskerstrand <k_f@gentoo.org> AuthorDate: 2018-11-24 18:25:45 +0000 Commit: Kristian Fiskerstrand <k_f@gentoo.org> CommitDate: 2018-11-28 19:55:18 +0000 gnome-extra/cinnamon: New upstream version 4.0.3 Closes: https://bugs.gentoo.org/671296 Closes: https://bugs.gentoo.org/666388 Closes: https://bugs.gentoo.org/666386 Closes: https://bugs.gentoo.org/666382 Signed-off-by: Kristian Fiskerstrand <k_f@gentoo.org> Package-Manager: Portage-2.3.51, Repoman-2.3.11 gnome-extra/cinnamon/Manifest | 1 + gnome-extra/cinnamon/cinnamon-4.0.3.ebuild | 209 +++++++++++++++++++++++++++++ 2 files changed, 210 insertions(+)