/usr/include/hocon/ is in libcpp-hocon-dev 0.1.6-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/hocon/config.hpp
/usr/include/hocon/config_exception.hpp
/usr/include/hocon/config_include_context.hpp
/usr/include/hocon/config_includer.hpp
/usr/include/hocon/config_includer_file.hpp
/usr/include/hocon/config_list.hpp
/usr/include/hocon/config_mergeable.hpp
/usr/include/hocon/config_object.hpp
/usr/include/hocon/config_origin.hpp
/usr/include/hocon/config_parse_options.hpp
/usr/include/hocon/config_parseable.hpp
/usr/include/hocon/config_render_options.hpp
/usr/include/hocon/config_resolve_options.hpp
/usr/include/hocon/config_syntax.hpp
/usr/include/hocon/config_value.hpp
/usr/include/hocon/config_value_factory.hpp
/usr/include/hocon/export.h
/usr/include/hocon/functional_list.hpp
/usr/include/hocon/parser/
/usr/include/hocon/parser/config_document.hpp
/usr/include/hocon/parser/config_document_factory.hpp
/usr/include/hocon/parser/config_node.hpp
/usr/include/hocon/path.hpp
/usr/include/hocon/program_options.hpp
/usr/include/hocon/types.hpp
/usr/include/hocon/version.h