/usr/include/ is in libweston-3-dev 3.0.0-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/libweston-3/
/usr/include/libweston-3/compositor-drm.h
/usr/include/libweston-3/compositor-fbdev.h
/usr/include/libweston-3/compositor-headless.h
/usr/include/libweston-3/compositor-rdp.h
/usr/include/libweston-3/compositor-wayland.h
/usr/include/libweston-3/compositor-x11.h
/usr/include/libweston-3/compositor.h
/usr/include/libweston-3/config-parser.h
/usr/include/libweston-3/libweston-desktop.h
/usr/include/libweston-3/matrix.h
/usr/include/libweston-3/plugin-registry.h
/usr/include/libweston-3/timeline-object.h
/usr/include/libweston-3/version.h
/usr/include/libweston-3/windowed-output-api.h
/usr/include/libweston-3/xwayland-api.h
/usr/include/libweston-3/zalloc.h