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#include <stdio.h> int main(void) { fprintf(stdout, "#define __cc_gnu__ 1\n" ); fprintf(stderr, "#include <...> search starts here:\n" " /some/include\n" " " TEST_DIR "/cc-gnu-builtin\n" " /some/Frameworks\n" " /some/CustomFW (framework directory)\n" ); return 0; }