/usr/ is in libconfig++-dev 1.5-0.4.
This file is owned by root:root, with mode 0o755.
..
/usr/include/
/usr/include/libconfig.h++
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/libconfig++.a
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/libconfig++.pc
/usr/share/
/usr/share/doc/
/usr/share/doc/libconfig++-dev/
/usr/share/doc/libconfig++-dev/copyright
/usr/share/doc/libconfig++-dev/examples/
/usr/share/doc/libconfig++-dev/examples/debian.Makefile
/usr/share/doc/libconfig++-dev/examples/example1.cpp
/usr/share/doc/libconfig++-dev/examples/example2.cpp
/usr/share/doc/libconfig++-dev/examples/example3.cpp
/usr/share/doc/libconfig++-dev/examples/example4.cpp
/usr/share/doc/libconfig++-dev/examples/invalid.cfg
/usr/lib/x86_64-linux-gnu/libconfig++.so
/usr/share/doc/libconfig++-dev/changelog.Debian.gz
/usr/share/doc/libconfig++-dev/examples/example.cfg