/usr/include/ is in libgldi-dev 3.4.1-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/cairo-dock/
/usr/include/cairo-dock/implementations/
/usr/include/cairo-dock/implementations/cairo-dock-gauge.h
/usr/include/cairo-dock/implementations/cairo-dock-progressbar.h
/usr/include/cairo-dock/implementations/cairo-dock-graph.h
/usr/include/cairo-dock/cairo-dock.h
/usr/include/cairo-dock/gldit/
/usr/include/cairo-dock/gldit/cairo-dock-desktop-manager.h
/usr/include/cairo-dock/gldit/cairo-dock-icon-manager.h
/usr/include/cairo-dock/gldit/cairo-dock-flying-container.h
/usr/include/cairo-dock/gldit/cairo-dock-dock-manager.h
/usr/include/cairo-dock/gldit/cairo-dock-keybinder.h
/usr/include/cairo-dock/gldit/gldi-config.h
/usr/include/cairo-dock/gldit/cairo-dock-themes-manager.h
/usr/include/cairo-dock/gldit/cairo-dock-overlay.h
/usr/include/cairo-dock/gldit/cairo-dock-dock-factory.h
/usr/include/cairo-dock/gldit/cairo-dock-module-instance-manager.h
/usr/include/cairo-dock/gldit/cairo-dock-utils.h
/usr/include/cairo-dock/gldit/cairo-dock-draw-opengl.h
/usr/include/cairo-dock/gldit/cairo-dock-applet-manager.h
/usr/include/cairo-dock/gldit/cairo-dock-file-manager.h
/usr/include/cairo-dock/gldit/cairo-dock-dialog-manager.h
/usr/include/cairo-dock/gldit/cairo-dock-data-renderer.h
/usr/include/cairo-dock/gldit/cairo-dock-indicator-manager.h
/usr/include/cairo-dock/gldit/cairo-dock-dialog-factory.h
/usr/include/cairo-dock/gldit/cairo-dock-applications-manager.h
/usr/include/cairo-dock/gldit/cairo-dock-draw.h
/usr/include/cairo-dock/gldit/cairo-dock-struct.h
/usr/include/cairo-dock/gldit/cairo-dock-data-renderer-manager.h
/usr/include/cairo-dock/gldit/cairo-dock-opengl-font.h
/usr/include/cairo-dock/gldit/cairo-dock-style-facility.h
/usr/include/cairo-dock/gldit/cairo-dock-applet-multi-instance.h
/usr/include/cairo-dock/gldit/cairo-dock-launcher-manager.h
/usr/include/cairo-dock/gldit/cairo-dock-gui-manager.h
/usr/include/cairo-dock/gldit/cairo-dock-task.h
/usr/include/cairo-dock/gldit/cairo-dock-icon-facility.h
/usr/include/cairo-dock/gldit/cairo-dock-user-icon-manager.h
/usr/include/cairo-dock/gldit/cairo-dock-animations.h
/usr/include/cairo-dock/gldit/cairo-dock-icon-factory.h
/usr/include/cairo-dock/gldit/cairo-dock-core.h
/usr/include/cairo-dock/gldit/cairo-dock-dock-facility.h
/usr/include/cairo-dock/gldit/cairo-dock-object.h
/usr/include/cairo-dock/gldit/cairo-dock-manager.h
/usr/include/cairo-dock/gldit/cairo-dock-menu.h
/usr/include/cairo-dock/gldit/cairo-dock-packages.h
/usr/include/cairo-dock/gldit/cairo-dock-particle-system.h
/usr/include/cairo-dock/gldit/cairo-dock-container.h
/usr/include/cairo-dock/gldit/cairo-dock-image-buffer.h
/usr/include/cairo-dock/gldit/cairo-dock-class-icon-manager.h
/usr/include/cairo-dock/gldit/cairo-dock-desklet-factory.h
/usr/include/cairo-dock/gldit/cairo-dock-stack-icon-manager.h
/usr/include/cairo-dock/gldit/cairo-dock-backends-manager.h
/usr/include/cairo-dock/gldit/cairo-dock-desklet-manager.h
/usr/include/cairo-dock/gldit/cairo-dock-application-facility.h
/usr/include/cairo-dock/gldit/cairo-dock-dbus.h
/usr/include/cairo-dock/gldit/cairo-dock-surface-factory.h
/usr/include/cairo-dock/gldit/cairo-dock-opengl-path.h
/usr/include/cairo-dock/gldit/cairo-dock-log.h
/usr/include/cairo-dock/gldit/cairo-dock-applet-facility.h
/usr/include/cairo-dock/gldit/cairo-dock-keyfile-utilities.h
/usr/include/cairo-dock/gldit/cairo-dock-opengl.h
/usr/include/cairo-dock/gldit/cairo-dock-class-manager.h
/usr/include/cairo-dock/gldit/cairo-dock-module-manager.h
/usr/include/cairo-dock/gldit/cairo-dock-global-variables.h
/usr/include/cairo-dock/gldit/cairo-dock-gui-factory.h
/usr/include/cairo-dock/gldit/gldi-icon-names.h
/usr/include/cairo-dock/gldit/cairo-dock-windows-manager.h
/usr/include/cairo-dock/gldit/cairo-dock-separator-manager.h
/usr/include/cairo-dock/gldit/cairo-dock-applet-canvas.h
/usr/include/cairo-dock/gldit/cairo-dock-applet-single-instance.h
/usr/include/cairo-dock/gldit/cairo-dock-config.h
/usr/include/cairo-dock/gldit/cairo-dock-style-manager.h