/usr/include/ is in libvw-dev 8.5.0.dfsg1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/vowpalwabbit/
/usr/include/vowpalwabbit/action_score.h
/usr/include/vowpalwabbit/allreduce.h
/usr/include/vowpalwabbit/cb.h
/usr/include/vowpalwabbit/cb_explore.h
/usr/include/vowpalwabbit/comp_io.h
/usr/include/vowpalwabbit/config.h
/usr/include/vowpalwabbit/constant.h
/usr/include/vowpalwabbit/cost_sensitive.h
/usr/include/vowpalwabbit/crossplat_compat.h
/usr/include/vowpalwabbit/example.h
/usr/include/vowpalwabbit/ezexample.h
/usr/include/vowpalwabbit/feature_group.h
/usr/include/vowpalwabbit/floatbits.h
/usr/include/vowpalwabbit/global_data.h
/usr/include/vowpalwabbit/hash.h
/usr/include/vowpalwabbit/io_buf.h
/usr/include/vowpalwabbit/label_parser.h
/usr/include/vowpalwabbit/learner.h
/usr/include/vowpalwabbit/loss_functions.h
/usr/include/vowpalwabbit/memory.h
/usr/include/vowpalwabbit/multiclass.h
/usr/include/vowpalwabbit/multilabel.h
/usr/include/vowpalwabbit/parse_example.h
/usr/include/vowpalwabbit/parse_primitives.h
/usr/include/vowpalwabbit/parser.h
/usr/include/vowpalwabbit/simple_label.h
/usr/include/vowpalwabbit/v_array.h
/usr/include/vowpalwabbit/v_hashmap.h
/usr/include/vowpalwabbit/vw.h
/usr/include/vowpalwabbit/vw_exception.h
/usr/include/vowpalwabbit/vw_validate.h
/usr/include/vowpalwabbit/vwdll.h