

AWS IoT Device SDK for Embedded Cをチュートリアルに沿って「$cmake ..」を実行したところ下記のエラーが発生しました。  
LIB_RTを解決するために何をしたら良いでしょうか。よろしくお願いいたします。  
環境はintel macとなっています。

チュートリアル:  
<https://docs.aws.amazon.com/ja_jp/iot/latest/developerguide/iot-embedded-c-
sdk.html>

[code]

    $ cmake ..
    ~
    中略
    ~
    
    -- Configuring done
    CMake Error: The following variables are used in this project, but they are set to NOTFOUND.
    Please set them or make sure they are set and tested correctly in the CMake files:
    LIB_RT
        linked by target "ota_demo_core_http" in directory ~/Core2-for-AWS-IoT-EduKit/aws-iot-device-sdk-embedded-c/demos/ota/ota_demo_core_http
        linked by target "ota_demo_core_mqtt" in directory ~/Core2-for-AWS-IoT-EduKit/aws-iot-device-sdk-embedded-c/demos/ota/ota_demo_core_mqtt
    
    -- Generating done
    CMake Generate step failed.  Build files cannot be regenerated correctly.
    
[/code]


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2021-06-03T13:25:21.740
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2021-06-04T00:49:54.897
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question
macos aws cmake
AWS IoT Device SDK for Embedded Cでのcmake Error : LIB_RTについて