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After installing the Intel toolkits, you need to setup the shell environment for the Intel tools. See https://www.intel.com/content/www/us/en/develop/documentation/oneapi-programming-guide/top/oneapi-development-environment-setup/use-the-setvars-script-with-linux-or-macos/use-a-config-file-for-setvars-sh-on-linux-or-macos.html for the guide to setup the environment. Here, simply source /opt/intel/oneapi/setvars.sh.