/usr/ is in libcaribou-dev 0.4.21-5.
This file is owned by root:root, with mode 0o755.
..
/usr/include/
/usr/include/libcaribou/
/usr/include/libcaribou/caribou.h
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/caribou-1.0.pc
/usr/share/
/usr/share/doc/
/usr/share/doc/libcaribou-dev/
/usr/share/doc/libcaribou-dev/copyright
/usr/share/gir-1.0/
/usr/share/gir-1.0/Caribou-1.0.gir
/usr/share/vala/
/usr/share/vala/vapi/
/usr/share/vala/vapi/caribou-1.0.deps
/usr/share/vala/vapi/caribou-1.0.vapi
/usr/lib/x86_64-linux-gnu/libcaribou.so
/usr/share/doc/libcaribou-dev/changelog.Debian.gz