clang -O2  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations sys_wait/waitid.c -o sys_wait/waitid -D_POSIX_C_SOURCE=202405L  -lm  -lintl
In file included from sys_wait/waitid.c:1:
/usr/include/sys/wait.h:175:1: error: unknown type name 'pid_t'
pid_t   wait(int *);
^
/usr/include/sys/wait.h:176:1: error: unknown type name 'pid_t'
pid_t   waitpid(pid_t, int *, int);
^
/usr/include/sys/wait.h:176:22: error: expected identifier
pid_t   waitpid(pid_t, int *, int);
                       ^
sys_wait/waitid.c:5:38: error: expected ')'
int (*foo)(idtype_t, id_t, siginfo_t *, int) = waitid;
                                     ^
sys_wait/waitid.c:5:11: note: to match this '('
int (*foo)(idtype_t, id_t, siginfo_t *, int) = waitid;
          ^
sys_wait/waitid.c:5:12: error: a parameter list without types is only allowed in a function definition
int (*foo)(idtype_t, id_t, siginfo_t *, int) = waitid;
           ^
sys_wait/waitid.c:5:48: error: use of undeclared identifier 'waitid'; did you mean 'waitpid'?
int (*foo)(idtype_t, id_t, siginfo_t *, int) = waitid;
                                               ^~~~~~
                                               waitpid
/usr/include/sys/wait.h:176:7: note: 'waitpid' declared here
pid_t   waitpid(pid_t, int *, int);
        ^
6 errors generated.