/usr/lib/x86_64-linux-gnu/cmake/ is in libqt5waylandcompositor5-dev 5.9.5-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/x86_64-linux-gnu/cmake/Qt5Gui/
/usr/lib/x86_64-linux-gnu/cmake/Qt5Gui/Qt5Gui_QWaylandEglPlatformIntegrationPlugin.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Gui/Qt5Gui_QWaylandIntegrationPlugin.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Gui/Qt5Gui_QWaylandXCompositeEglPlatformIntegrationPlugin.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5Gui/Qt5Gui_QWaylandXCompositeGlxPlatformIntegrationPlugin.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5WaylandCompositor/
/usr/lib/x86_64-linux-gnu/cmake/Qt5WaylandCompositor/Qt5WaylandCompositorConfig.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5WaylandCompositor/Qt5WaylandCompositorConfigVersion.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5WaylandCompositor/Qt5WaylandCompositor_DrmEglServerBufferIntegrationPlugin.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5WaylandCompositor/Qt5WaylandCompositor_QWaylandEglClientBufferIntegrationPlugin.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5WaylandCompositor/Qt5WaylandCompositor_QWaylandXCompositeEglClientBufferIntegrationPlugin.cmake
/usr/lib/x86_64-linux-gnu/cmake/Qt5WaylandCompositor/Qt5WaylandCompositor_QWaylandXCompositeGlxClientBufferIntegrationPlugin.cmake