/opt/IBM/openxlC/17.1.1/bin/ibm-clang -pthread  -Wall -Wextra -Werror=implicit-function-declaration stdio/asprintf.c -o stdio/asprintf -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE -lm -lpthread -lrt -latomic
stdio/asprintf.c:10:12: error: call to undeclared function 'asprintf'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]
        int ret = asprintf(&buf, "hello %s %d", "world", 42);
                  ^
1 error generated.