clang -O2  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations unistd/_Fork.c -o unistd/_Fork -D_POSIX_C_SOURCE=202405L  -lm  -lintl
unistd/_Fork.c:5:22: error: use of undeclared identifier '_Fork'; did you mean 'fork'?
pid_t (*foo)(void) = _Fork;
                     ^~~~~
                     fork
/usr/include/unistd.h:111:8: note: 'fork' declared here
pid_t    fork(void);
         ^
1 error generated.