'Where is _CONF_DIR being loaded from?

newbie question, where is _CONF_DIR being loaded from in:

std::string const ConfigMgr::GetConfigPath()
{
    std::lock_guard<std::mutex> lock(_configLock);

#if AC_PLATFORM == AC_PLATFORM_WINDOWS
    return "configs/";
#else
    return std::string(_CONF_DIR) + "/";
#endif
}

assumed it was an environment variable / cmd line variable but adding -D_CONF_DIR="..." doesn't seem to be doing anything; seems to be defaulting to /usr/local/etc



Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source