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