/usr/include/libawn/ is in libawn-dev 0.4.1~bzr830-2ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/libawn/awn-alignment.h
/usr/include/libawn/awn-applet-simple.h
/usr/include/libawn/awn-applet.h
/usr/include/libawn/awn-box.h
/usr/include/libawn/awn-cairo-utils.h
/usr/include/libawn/awn-config.h
/usr/include/libawn/awn-dbus-watcher.h
/usr/include/libawn/awn-defines.h
/usr/include/libawn/awn-desktop-lookup-client.h
/usr/include/libawn/awn-dialog.h
/usr/include/libawn/awn-effects.h
/usr/include/libawn/awn-icon-box.h
/usr/include/libawn/awn-icon.h
/usr/include/libawn/awn-image.h
/usr/include/libawn/awn-label.h
/usr/include/libawn/awn-overlay-pixbuf-file.h
/usr/include/libawn/awn-overlay-pixbuf.h
/usr/include/libawn/awn-overlay-progress-circle.h
/usr/include/libawn/awn-overlay-progress.h
/usr/include/libawn/awn-overlay-text.h
/usr/include/libawn/awn-overlay-themed-icon.h
/usr/include/libawn/awn-overlay-throbber.h
/usr/include/libawn/awn-overlay.h
/usr/include/libawn/awn-overlayable.h
/usr/include/libawn/awn-pixbuf-cache.h
/usr/include/libawn/awn-themed-icon.h
/usr/include/libawn/awn-tooltip.h
/usr/include/libawn/awn-utils.h
/usr/include/libawn/libawn.h