/opt/IBM/openxlC/17.1.1/bin/ibm-clang -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations unistd/dup3.c -o unistd/dup3 -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -latomic
unistd/dup3.c:5:29: error: use of undeclared identifier 'dup3'
int (*foo)(int, int, int) = dup3;
                            ^
1 error generated.