clang -O2  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations fnmatch/FNM_IGNORECASE.c -o fnmatch/FNM_IGNORECASE -D_POSIX_C_SOURCE=202405L  -lm  -lintl
fnmatch/FNM_IGNORECASE.c:2:17: error: use of undeclared identifier 'FNM_IGNORECASE'
int const foo = FNM_IGNORECASE;
                ^
1 error generated.