/usr/ is in libdtkwm-dev 2.0.7-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/include/
/usr/include/libdtk-2.0/
/usr/include/libdtk-2.0/DWm/
/usr/include/libdtk-2.0/DWm/dscreenwindowsutil.h
/usr/include/libdtk-2.0/DWm/dtkwm_global.h
/usr/include/libdtk-2.0/DWm/dwindowmanager.h
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/pkgconfig/dtkwm.pc
/usr/share/
/usr/share/doc/
/usr/share/doc/libdtkwm-dev/
/usr/share/doc/libdtkwm-dev/README.md
/usr/share/doc/libdtkwm-dev/copyright
/usr/share/doc/libdtkwm-dev/examples/
/usr/share/doc/libdtkwm-dev/examples/examples.pro
/usr/share/doc/libdtkwm-dev/examples/main.cpp
/usr/share/doc/libdtkwm-dev/examples/mainwindow.cpp
/usr/share/doc/libdtkwm-dev/examples/mainwindow.h
/usr/lib/x86_64-linux-gnu/libdtkwm.so
/usr/share/doc/libdtkwm-dev/changelog.Debian.gz