/usr/ is in libconfig++-dev 1.4.9-2.
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..
/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/include/
/usr/include/libconfig.h++
/usr/share/
/usr/share/doc/
/usr/share/doc/libconfig++-dev/
/usr/share/doc/libconfig++-dev/examples/
/usr/share/doc/libconfig++-dev/examples/invalid.cfg
/usr/share/doc/libconfig++-dev/examples/example2.cpp
/usr/share/doc/libconfig++-dev/examples/example4.cpp
/usr/share/doc/libconfig++-dev/examples/debian.Makefile
/usr/share/doc/libconfig++-dev/examples/example1.cpp.gz
/usr/share/doc/libconfig++-dev/examples/example3.cpp
/usr/share/doc/libconfig++-dev/copyright
/usr/lib/x86_64-linux-gnu/libconfig++.so
/usr/share/doc/libconfig++-dev/examples/example.cfg
/usr/share/doc/libconfig++-dev/changelog.Debian.gz