In Portage the stable version of zeromq is 3.2.3. In according to https://github.com/zeromq/pyzmq/blob/master/README.md the PyZMQ release that fully supports the 3.x API of zeromq is >=2.2.0 Otherwise errors like this Traceback (most recent call last): File "/usr/lib64/python3.2/site-packages/IPython/zmq/ipkernel.py", line 134, in do_one_iteration ident,msg = self.session.recv(self.shell_socket, zmq.NOBLOCK) File "/usr/lib64/python3.2/site-packages/IPython/zmq/session.py", line 632, in recv msg_list = socket.recv_multipart(mode) File "socket.pyx", line 729, in zmq.core.socket.Socket.recv_multipart (zmq/core/socket.c:6579) File "socket.pyx", line 367, in zmq.core.socket.Socket.getsockopt (zmq/core/socket.c:3729) zmq.core.error.ZMQError: Invalid argument will appear (in this case using ipython-qtconsole)
Newer version went to stable already