/usr/ is in libqtxdg0-dev 0.5.2-4build1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/qtxdg/
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/qtxdg.pc
/usr/share/
/usr/share/doc/
/usr/share/doc/libqtxdg0-dev/
/usr/share/doc/libqtxdg0-dev/copyright
/usr/include/
/usr/include/qtxdg/xdgmenuwidget.h
/usr/include/qtxdg/xdgmenu.h
/usr/include/qtxdg/xdgaction.h
/usr/include/qtxdg/xmlhelper.h
/usr/include/qtxdg/xdgicon.h
/usr/include/qtxdg/xdgmime.h
/usr/include/qtxdg/xdgdirs.h
/usr/include/qtxdg/xdgautostart.h
/usr/include/qtxdg/xdgdesktopfile.h
/usr/lib/x86_64-linux-gnu/libqtxdg.so
/usr/share/doc/libqtxdg0-dev/changelog.Debian.gz