/usr/ is in libqt5xdg-dev 3.1.0-5build2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/
/usr/include/qt5xdg/
/usr/include/qt5xdg/XdgAction
/usr/include/qt5xdg/XdgAutoStart
/usr/include/qt5xdg/XdgDesktopFile
/usr/include/qt5xdg/XdgDirs
/usr/include/qt5xdg/XdgIcon
/usr/include/qt5xdg/XdgMenu
/usr/include/qt5xdg/XdgMenuWidget
/usr/include/qt5xdg/XdgMimeType
/usr/include/qt5xdg/XmlHelper
/usr/include/qt5xdg/xdgaction.h
/usr/include/qt5xdg/xdgautostart.h
/usr/include/qt5xdg/xdgdesktopfile.h
/usr/include/qt5xdg/xdgdirs.h
/usr/include/qt5xdg/xdgicon.h
/usr/include/qt5xdg/xdgmacros.h
/usr/include/qt5xdg/xdgmenu.h
/usr/include/qt5xdg/xdgmenuwidget.h
/usr/include/qt5xdg/xdgmimetype.h
/usr/include/qt5xdg/xmlhelper.h
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/Qt5Xdg.pc
/usr/share/
/usr/share/cmake/
/usr/share/cmake/qt5xdg/
/usr/share/cmake/qt5xdg/qt5xdg-config-version.cmake
/usr/share/cmake/qt5xdg/qt5xdg-config.cmake
/usr/share/cmake/qt5xdg/qt5xdg-targets-relwithdebinfo.cmake
/usr/share/cmake/qt5xdg/qt5xdg-targets.cmake
/usr/share/doc/
/usr/share/doc/libqt5xdg-dev/
/usr/share/doc/libqt5xdg-dev/copyright
/usr/lib/x86_64-linux-gnu/libQt5Xdg.so
/usr/share/doc/libqt5xdg-dev/changelog.Debian.gz