Error: "None of the required 'openssl' found"

[honnet]

It looks like openssl is required and not installed by default on some machines* but it's required:

shopper-gaze-monitor-cpp/cmake/pahomqtt.cmake

Line 7 in fbaa940

pkg_search_module(OPENSSL REQUIRED openssl)

Installing libssl-dev solved my problem:
sudo apt-get install libssl-dev

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*at least not in the one given during the workshops:
https://iotevents.intel.com/OpenVINOSiliconValley/