/opt/IBM/openxlC/17.1.1/bin/ibm-clang -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations fnmatch/FNM_CASEFOLD.c -o fnmatch/FNM_CASEFOLD -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -latomic
fnmatch/FNM_CASEFOLD.c:2:17: error: use of undeclared identifier 'FNM_CASEFOLD'
int const foo = FNM_CASEFOLD;
                ^
1 error generated.