/opt/IBM/openxlC/17.1.1/bin/ibm-clang -pthread  -Wall -Wextra -Werror=implicit-function-declaration wchar/wcslcat.c -o wchar/wcslcat -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE -lm -lpthread -lrt -latomic
wchar/wcslcat.c:11:18: error: call to undeclared function 'wcslcat'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]
        size_t result = wcslcat(dst, src, 8);
                        ^
1 error generated.