/usr/include/libtomahawk/network/ is in libtomahawk-dev 0.8.4+dfsg1-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/libtomahawk/network/BufferIoDevice.h
/usr/include/libtomahawk/network/BufferIoDevice_p.h
/usr/include/libtomahawk/network/Connection.h
/usr/include/libtomahawk/network/ConnectionManager.h
/usr/include/libtomahawk/network/ConnectionManager_p.h
/usr/include/libtomahawk/network/Connection_p.h
/usr/include/libtomahawk/network/ControlConnection.h
/usr/include/libtomahawk/network/ControlConnection_p.h
/usr/include/libtomahawk/network/DBSyncConnectionState.h
/usr/include/libtomahawk/network/DbSyncConnection.h
/usr/include/libtomahawk/network/Enums.h
/usr/include/libtomahawk/network/Msg.h
/usr/include/libtomahawk/network/MsgProcessor.h
/usr/include/libtomahawk/network/Msg_p.h
/usr/include/libtomahawk/network/PortFwdThread.h
/usr/include/libtomahawk/network/QTcpSocketExtra.h
/usr/include/libtomahawk/network/RemoteCollection.h
/usr/include/libtomahawk/network/Servent.h
/usr/include/libtomahawk/network/Servent_p.h
/usr/include/libtomahawk/network/StreamConnection.h