Hi,

I asked this question/issue one and a half year ago (https://lists.zeromq.org/mailman/private/zeromq-dev/2017-January/031309.html). The difference is that I now would like to use zeromq (draft api) version 4.2.5 under Ubuntu 18.04.

My minimal (not) working example can be found here: https://gist.github.com/StephanOpfer/5b9f3f76e6610536078cb9c16072aac9

Compiling it with this command:

    g++ Discovery.cpp -lzmq -DZMQ_BUILD_DRAFT_API=1 -o test

produces this:

    /tmp/ccUwelWs.o: In function `msg_send(zmq_msg_t*, void*, char const*, char const*)':
    Discovery.cpp:(.text+0x8e): undefined reference to `zmq_msg_set_group'
    /tmp/ccUwelWs.o: In function `msg_recv_cmp(zmq_msg_t*, void*, char const*, char const*)':
    Discovery.cpp:(.text+0x148): undefined reference to `zmq_msg_group'
    /tmp/ccUwelWs.o: In function `main':
    Discovery.cpp:(.text+0x30e): undefined reference to `zmq_leave'
    Discovery.cpp:(.text+0x37f): undefined reference to `zmq_join'
    Discovery.cpp:(.text+0x3c3): undefined reference to `zmq_join'
    Discovery.cpp:(.text+0x407): undefined reference to `zmq_join'
    Discovery.cpp:(.text+0x57c): undefined reference to `zmq_join'
    Discovery.cpp:(.text+0x668): undefined reference to `zmq_leave'
    collect2: error: ld returned 1 exit status

Any help is welcome. :)

Kind Regards

  Stephan


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