As of 1.5.0, the stream operators are only declared for the class LinuxServer, the base class LinuxSocket might need the same operators.
I reworked the LinuxServer/LinuxSocket classes to move the << and >> operators from LinuxServer to LinuxSocket. By the way, LinuxServer::accept requires a LinuxSocket argument (this change might break other code).
Proposed patch is attached to this report. It is based on revision 77.
proposed patch
Sorry, it is based on revision 82. By the way, this revision enables non_blocking sockets.