Gudmundur Adalsteinsson 5999e5adc7
Problem: Macros not defined in older versions (#386)
* Problem: Macros not defined in older versions

Solution: Guard usage of libzmq macros

* Test older version of libzmq with C++11 or later

* Use a slightly newer libzmq version
2020-02-21 11:29:12 +01:00
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