/usr/include/lexertl/parser/ is in libpuma-dev 1:1.2-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/lexertl/parser/parser.hpp
/usr/include/lexertl/parser/tokeniser/
/usr/include/lexertl/parser/tokeniser/re_token.hpp
/usr/include/lexertl/parser/tokeniser/re_tokeniser.hpp
/usr/include/lexertl/parser/tokeniser/re_tokeniser_helper.hpp
/usr/include/lexertl/parser/tokeniser/re_tokeniser_state.hpp
/usr/include/lexertl/parser/tree/
/usr/include/lexertl/parser/tree/end_node.hpp
/usr/include/lexertl/parser/tree/iteration_node.hpp
/usr/include/lexertl/parser/tree/leaf_node.hpp
/usr/include/lexertl/parser/tree/node.hpp
/usr/include/lexertl/parser/tree/selection_node.hpp
/usr/include/lexertl/parser/tree/sequence_node.hpp