How to address the problme: “build error: ‘zmq::recv_flags’ has not been declared“

The Problem Description:

I compile a C++ project well in ubuntu 20.4 but encounter the problems shown in title in ubuntu 18.04.

The Solutions to address that problems

  1. http://t.csdn.cn/MiUMg

  1. Install the libzmq3-dev/

sudo apt install libzmq3-dev

The Rethinking

The problem is attributed to the version of operating system. Therefore, if you want to completely avoid this problem, you should upgrate your operating system to the 20.04 version.

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