/usr/include/ClanLib-1.0/ClanLib/Network/ is in libclanlib-dev 1.0~svn3827-4.1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/ClanLib-1.0/ClanLib/Network/IRC/
/usr/include/ClanLib-1.0/ClanLib/Network/IRC/dcc_download.h
/usr/include/ClanLib-1.0/ClanLib/Network/IRC/irc_connection.h
/usr/include/ClanLib-1.0/ClanLib/Network/IRC/irc_numerics.h
/usr/include/ClanLib-1.0/ClanLib/Network/NetObjects/
/usr/include/ClanLib-1.0/ClanLib/Network/NetObjects/netobject_client.h
/usr/include/ClanLib-1.0/ClanLib/Network/NetObjects/netobject_controller.h
/usr/include/ClanLib-1.0/ClanLib/Network/NetObjects/netobject_server.h
/usr/include/ClanLib-1.0/ClanLib/Network/NetSession/
/usr/include/ClanLib-1.0/ClanLib/Network/NetSession/inputsource_netpacket.h
/usr/include/ClanLib-1.0/ClanLib/Network/NetSession/inputsource_netstream.h
/usr/include/ClanLib-1.0/ClanLib/Network/NetSession/netcomputer.h
/usr/include/ClanLib-1.0/ClanLib/Network/NetSession/netgroup.h
/usr/include/ClanLib-1.0/ClanLib/Network/NetSession/netpacket.h
/usr/include/ClanLib-1.0/ClanLib/Network/NetSession/netsession.h
/usr/include/ClanLib-1.0/ClanLib/Network/NetSession/netstream.h
/usr/include/ClanLib-1.0/ClanLib/Network/NetSession/outputsource_netpacket.h
/usr/include/ClanLib-1.0/ClanLib/Network/NetSession/outputsource_netstream.h
/usr/include/ClanLib-1.0/ClanLib/Network/NetVariables/
/usr/include/ClanLib-1.0/ClanLib/Network/NetVariables/netvariables.h
/usr/include/ClanLib-1.0/ClanLib/Network/Socket/
/usr/include/ClanLib-1.0/ClanLib/Network/Socket/inputsource_socket.h
/usr/include/ClanLib-1.0/ClanLib/Network/Socket/ip_address.h
/usr/include/ClanLib-1.0/ClanLib/Network/Socket/outputsource_socket.h
/usr/include/ClanLib-1.0/ClanLib/Network/Socket/socket.h
/usr/include/ClanLib-1.0/ClanLib/Network/setupnetwork.h