/usr/ is in libnacore-dev 0.5.1-3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/
/usr/include/NASPRO/
/usr/include/NASPRO/core-5/
/usr/include/NASPRO/core-5/NASPRO/
/usr/include/NASPRO/core-5/NASPRO/core/
/usr/include/NASPRO/core-5/NASPRO/core/avl.h
/usr/include/NASPRO/core-5/NASPRO/core/cc.h
/usr/include/NASPRO/core-5/NASPRO/core/dl.h
/usr/include/NASPRO/core-5/NASPRO/core/env.h
/usr/include/NASPRO/core-5/NASPRO/core/fs.h
/usr/include/NASPRO/core-5/NASPRO/core/lib.h
/usr/include/NASPRO/core-5/NASPRO/core/list.h
/usr/include/NASPRO/core-5/NASPRO/core/locale.h
/usr/include/NASPRO/core-5/NASPRO/core/msg.h
/usr/include/NASPRO/core-5/NASPRO/core/mutex.h
/usr/include/NASPRO/core-5/NASPRO/core/sem.h
/usr/include/NASPRO/core-5/NASPRO/core/string.h
/usr/include/NASPRO/core-5/NASPRO/core/thread.h
/usr/include/NASPRO/core-5/NASPRO/core/types.h
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/nacore-5.pc
/usr/share/
/usr/share/doc/
/usr/share/doc/libnacore-dev/
/usr/share/doc/libnacore-dev/copyright
/usr/lib/x86_64-linux-gnu/libnacore.so
/usr/share/doc/libnacore-dev/changelog.Debian.gz