/usr/ is in libmatekbd-dev 1.12.1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/
/usr/include/libmatekbd/
/usr/share/
/usr/share/doc/
/usr/share/doc/libmatekbd-dev/
/usr/share/doc/libmatekbd-dev/copyright
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/libmatekbd.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/libmatekbdui.pc
/usr/include/libmatekbd/matekbd-util.h
/usr/include/libmatekbd/matekbd-keyboard-config.h
/usr/include/libmatekbd/matekbd-status.h
/usr/include/libmatekbd/matekbd-indicator-config.h
/usr/include/libmatekbd/matekbd-desktop-config.h
/usr/include/libmatekbd/matekbd-keyboard-drawing.h
/usr/include/libmatekbd/matekbd-indicator.h
/usr/share/doc/libmatekbd-dev/changelog.Debian.gz
/usr/lib/x86_64-linux-gnu/libmatekbd.so
/usr/lib/x86_64-linux-gnu/libmatekbdui.so