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The workaround_9220 function was introduced a long time ago to workaround a CMake issue with enable_language(OPTIONAL). Since then CMake has clarified that the OPTIONAL keywords has not been implemented[0]. A CheckLanguage module is now provided with CMake to check if a language can be enabled. Use that instead. [0] https://cmake.org/cmake/help/v3.18/command/enable_language.html