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Resolve issue building with missing variable declarations, error: ``` /src/cmake_clang/CMakeFiles/CheckTypeSize/CMAKE_SIZEOF_UNSIGNED_LONG.c:24:6: error: no previous extern declaration for non-static variable 'info_size' [-Werror,-Wmissing-variable-declarations] char info_size[] = {'I', 'N', 'F', 'O', ':', 's','i','z','e','[', ^ 1 error generated. ```
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