/usr/ is in libxfce4ui-2-dev 4.13.4-1ubuntu1.
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..
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/include/
/usr/include/xfce4/
/usr/include/xfce4/libxfce4kbd-private-3/
/usr/include/xfce4/libxfce4kbd-private-3/libxfce4kbd-private/
/usr/include/xfce4/libxfce4kbd-private-3/libxfce4kbd-private/xfce-shortcut-dialog.h
/usr/include/xfce4/libxfce4kbd-private-3/libxfce4kbd-private/xfce-shortcuts-grabber.h
/usr/include/xfce4/libxfce4kbd-private-3/libxfce4kbd-private/xfce-shortcuts-provider.h
/usr/include/xfce4/libxfce4kbd-private-3/libxfce4kbd-private/xfce-shortcuts-xfwm4.h
/usr/include/xfce4/libxfce4kbd-private-3/libxfce4kbd-private/xfce-shortcuts.h
/usr/include/xfce4/libxfce4ui-2/
/usr/include/xfce4/libxfce4ui-2/libxfce4ui/
/usr/include/xfce4/libxfce4ui-2/libxfce4ui/libxfce4ui-config.h
/usr/include/xfce4/libxfce4ui-2/libxfce4ui/libxfce4ui-enum-types.h
/usr/include/xfce4/libxfce4ui-2/libxfce4ui/libxfce4ui.h
/usr/include/xfce4/libxfce4ui-2/libxfce4ui/xfce-dialogs.h
/usr/include/xfce4/libxfce4ui-2/libxfce4ui/xfce-gdk-extensions.h
/usr/include/xfce4/libxfce4ui-2/libxfce4ui/xfce-gtk-extensions.h
/usr/include/xfce4/libxfce4ui-2/libxfce4ui/xfce-sm-client.h
/usr/include/xfce4/libxfce4ui-2/libxfce4ui/xfce-spawn.h
/usr/include/xfce4/libxfce4ui-2/libxfce4ui/xfce-titled-dialog.h
/usr/lib/x86_64-linux-gnu/pkgconfig/libxfce4kbd-private-3.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/libxfce4ui-2.pc
/usr/share/
/usr/share/doc/
/usr/share/doc/libxfce4ui-2-dev/
/usr/share/doc/libxfce4ui-2-dev/copyright
/usr/lib/x86_64-linux-gnu/libxfce4kbd-private-3.so
/usr/lib/x86_64-linux-gnu/libxfce4ui-2.so
/usr/share/doc/libxfce4ui-2-dev/NEWS.Debian.gz
/usr/share/doc/libxfce4ui-2-dev/changelog.Debian.gz