cc -pipe -O   -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations unistd/_Fork.c -o unistd/_Fork -D_POSIX_C_SOURCE=202405L  -lm -lpthread -lrt  -lrt -lcrypt
unistd/_Fork.c:5:22: error: '_Fork' undeclared here (not in a function); did you mean 'fork'?
 pid_t (*foo)(void) = _Fork;
                      ^~~~~
                      fork