/usr/ is in libt3window-dev 0.3.0-1build2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/
/usr/share/doc/libt3window-dev/
/usr/include/
/usr/include/t3/
/usr/include/t3/window/
/usr/include/t3/window/t3window/
/usr/include/t3/window/t3window/terminal.h
/usr/include/t3/window/t3window/utf8.h
/usr/include/t3/window/t3window/window.h
/usr/include/t3/window/t3window/window_api.h
/usr/include/t3/window/t3window/window_errors.h
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/libt3window.pc
/usr/share/
/usr/share/doc/libt3window-dev/copyright
/usr/lib/x86_64-linux-gnu/libt3window.so
/usr/share/doc/libt3window-dev/changelog.Debian.gz