/usr/include/websocketpp/common/ is in libwebsocketpp-dev 0.7.0-7.
This file is owned by root:root, with mode 0o755.
..
/usr/include/websocketpp/common/asio.hpp
/usr/include/websocketpp/common/asio_ssl.hpp
/usr/include/websocketpp/common/chrono.hpp
/usr/include/websocketpp/common/connection_hdl.hpp
/usr/include/websocketpp/common/cpp11.hpp
/usr/include/websocketpp/common/functional.hpp
/usr/include/websocketpp/common/md5.hpp
/usr/include/websocketpp/common/memory.hpp
/usr/include/websocketpp/common/network.hpp
/usr/include/websocketpp/common/platforms.hpp
/usr/include/websocketpp/common/random.hpp
/usr/include/websocketpp/common/regex.hpp
/usr/include/websocketpp/common/stdint.hpp
/usr/include/websocketpp/common/system_error.hpp
/usr/include/websocketpp/common/thread.hpp
/usr/include/websocketpp/common/time.hpp
/usr/include/websocketpp/common/type_traits.hpp