/usr/include/actionlib/client/ is in libactionlib-dev 1.11.12-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/actionlib/client/action_client.h
/usr/include/actionlib/client/client_goal_handle_imp.h
/usr/include/actionlib/client/client_helpers.h
/usr/include/actionlib/client/comm_state.h
/usr/include/actionlib/client/comm_state_machine_imp.h
/usr/include/actionlib/client/connection_monitor.h
/usr/include/actionlib/client/goal_manager_imp.h
/usr/include/actionlib/client/service_client.h
/usr/include/actionlib/client/service_client_imp.h
/usr/include/actionlib/client/simple_action_client.h
/usr/include/actionlib/client/simple_client_goal_state.h
/usr/include/actionlib/client/simple_goal_state.h
/usr/include/actionlib/client/terminal_state.h