/usr/include/rocksdb/ is in librocksdb-dev 4.1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/rocksdb/c.h
/usr/include/rocksdb/cache.h
/usr/include/rocksdb/compaction_filter.h
/usr/include/rocksdb/compaction_job_stats.h
/usr/include/rocksdb/comparator.h
/usr/include/rocksdb/convenience.h
/usr/include/rocksdb/db.h
/usr/include/rocksdb/db_dump_tool.h
/usr/include/rocksdb/delete_scheduler.h
/usr/include/rocksdb/env.h
/usr/include/rocksdb/experimental.h
/usr/include/rocksdb/filter_policy.h
/usr/include/rocksdb/flush_block_policy.h
/usr/include/rocksdb/immutable_options.h
/usr/include/rocksdb/iostats_context.h
/usr/include/rocksdb/iterator.h
/usr/include/rocksdb/ldb_tool.h
/usr/include/rocksdb/listener.h
/usr/include/rocksdb/memtablerep.h
/usr/include/rocksdb/merge_operator.h
/usr/include/rocksdb/metadata.h
/usr/include/rocksdb/options.h
/usr/include/rocksdb/perf_context.h
/usr/include/rocksdb/perf_level.h
/usr/include/rocksdb/rate_limiter.h
/usr/include/rocksdb/slice.h
/usr/include/rocksdb/slice_transform.h
/usr/include/rocksdb/snapshot.h
/usr/include/rocksdb/sst_dump_tool.h
/usr/include/rocksdb/sst_file_writer.h
/usr/include/rocksdb/statistics.h
/usr/include/rocksdb/status.h
/usr/include/rocksdb/table.h
/usr/include/rocksdb/table_properties.h
/usr/include/rocksdb/thread_status.h
/usr/include/rocksdb/transaction_log.h
/usr/include/rocksdb/types.h
/usr/include/rocksdb/universal_compaction.h
/usr/include/rocksdb/utilities/
/usr/include/rocksdb/utilities/backupable_db.h
/usr/include/rocksdb/utilities/checkpoint.h
/usr/include/rocksdb/utilities/convenience.h
/usr/include/rocksdb/utilities/db_ttl.h
/usr/include/rocksdb/utilities/document_db.h
/usr/include/rocksdb/utilities/flashcache.h
/usr/include/rocksdb/utilities/geo_db.h
/usr/include/rocksdb/utilities/info_log_finder.h
/usr/include/rocksdb/utilities/json_document.h
/usr/include/rocksdb/utilities/leveldb_options.h
/usr/include/rocksdb/utilities/optimistic_transaction_db.h
/usr/include/rocksdb/utilities/spatial_db.h
/usr/include/rocksdb/utilities/stackable_db.h
/usr/include/rocksdb/utilities/table_properties_collectors.h
/usr/include/rocksdb/utilities/transaction.h
/usr/include/rocksdb/utilities/transaction_db.h
/usr/include/rocksdb/utilities/transaction_db_mutex.h
/usr/include/rocksdb/utilities/utility_db.h
/usr/include/rocksdb/utilities/write_batch_with_index.h
/usr/include/rocksdb/version.h
/usr/include/rocksdb/write_batch.h
/usr/include/rocksdb/write_batch_base.h