libmutter-6-dev 3.36.4-0ubuntu0.20.04.2 (amd64 binary) in ubuntu focal

 Mutter is a Wayland display server and X11 window manager and
 compositor library. It contains functionality related to, among other
 things, window management, window compositing, focus tracking, workspace
 management, keybindings and monitor configuration.
 .
 Internally it uses a fork of Cogl, a hardware acceleration abstraction
 library used to simplify usage of OpenGL pipelines, as well as a fork
 of Clutter, a scene graph and user interface toolkit.
 .
 This package contains the development files.