I don't know about building, but this post from philmoz suggests that it might not be able to access the camera under 10.11 https://chdk.setepontos.com/index.php?topic=12133.msg124655#msg124655Note that the github you linked is some random fork I know nothing about. The official source is in the assembla project https://app.assembla.com/spaces/chdkptp/wiki
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