/usr/include/libdazzle-1.0/panel/ is in libdazzle-1.0-dev 3.28.1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/libdazzle-1.0/panel/dzl-dock-bin-edge.h
/usr/include/libdazzle-1.0/panel/dzl-dock-bin.h
/usr/include/libdazzle-1.0/panel/dzl-dock-item.h
/usr/include/libdazzle-1.0/panel/dzl-dock-manager.h
/usr/include/libdazzle-1.0/panel/dzl-dock-overlay-edge.h
/usr/include/libdazzle-1.0/panel/dzl-dock-overlay.h
/usr/include/libdazzle-1.0/panel/dzl-dock-paned.h
/usr/include/libdazzle-1.0/panel/dzl-dock-revealer.h
/usr/include/libdazzle-1.0/panel/dzl-dock-stack.h
/usr/include/libdazzle-1.0/panel/dzl-dock-transient-grab.h
/usr/include/libdazzle-1.0/panel/dzl-dock-types.h
/usr/include/libdazzle-1.0/panel/dzl-dock-widget.h
/usr/include/libdazzle-1.0/panel/dzl-dock-window.h
/usr/include/libdazzle-1.0/panel/dzl-dock.h
/usr/include/libdazzle-1.0/panel/dzl-tab-strip.h
/usr/include/libdazzle-1.0/panel/dzl-tab.h