/usr/ is in libgroonga-dev 8.0.0-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/groonga/groonga/
/usr/include/
/usr/include/groonga/
/usr/include/groonga/groonga/accessor.h
/usr/include/groonga/groonga/array.h
/usr/include/groonga/groonga/arrow.h
/usr/include/groonga/groonga/arrow.hpp
/usr/include/groonga/groonga/cache.h
/usr/include/groonga/groonga/column.h
/usr/include/groonga/groonga/command.h
/usr/include/groonga/groonga/config.h
/usr/include/groonga/groonga/dat.h
/usr/include/groonga/groonga/db.h
/usr/include/groonga/groonga/dump.h
/usr/include/groonga/groonga/error.h
/usr/include/groonga/groonga/expr.h
/usr/include/groonga/groonga/file_reader.h
/usr/include/groonga/groonga/geo.h
/usr/include/groonga/groonga/groonga.h
/usr/include/groonga/groonga/hash.h
/usr/include/groonga/groonga/id.h
/usr/include/groonga/groonga/ii.h
/usr/include/groonga/groonga/nfkc.h
/usr/include/groonga/groonga/normalizer.h
/usr/include/groonga/groonga/obj.h
/usr/include/groonga/groonga/operator.h
/usr/include/groonga/groonga/output.h
/usr/include/groonga/groonga/pat.h
/usr/include/groonga/groonga/plugin.h
/usr/include/groonga/groonga/portability.h
/usr/include/groonga/groonga/request_canceler.h
/usr/include/groonga/groonga/request_timer.h
/usr/include/groonga/groonga/scorer.h
/usr/include/groonga/groonga/table.h
/usr/include/groonga/groonga/thread.h
/usr/include/groonga/groonga/time.h
/usr/include/groonga/groonga/token.h
/usr/include/groonga/groonga/token_filter.h
/usr/include/groonga/groonga/tokenizer.h
/usr/include/groonga/groonga/type.h
/usr/include/groonga/groonga/util.h
/usr/include/groonga/groonga/window_function.h
/usr/include/groonga/groonga/windows.h
/usr/include/groonga/groonga/windows_event_logger.h
/usr/include/groonga/groonga.h
/usr/include/groonga/groonga.hpp
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/groonga.pc
/usr/share/
/usr/share/doc/
/usr/share/doc/libgroonga-dev/
/usr/share/doc/libgroonga-dev/copyright
/usr/lib/x86_64-linux-gnu/libgroonga.so
/usr/share/doc/libgroonga-dev/changelog.Debian.gz