clang -O2  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations unistd/getresuid.c -o unistd/getresuid -D_POSIX_C_SOURCE=202405L  -lm  -lintl
unistd/getresuid.c:11:65: error: use of undeclared identifier 'getresuid'; did you mean 'geteuid'?
int (*foo)(uid_t *restrict, uid_t *restrict, uid_t *restrict) = getresuid;
                                                                ^~~~~~~~~
                                                                geteuid
/usr/include/unistd.h:117:8: note: 'geteuid' declared here
uid_t    geteuid(void);
         ^
unistd/getresuid.c:11:7: error: incompatible pointer types initializing 'int (*)(__uid_t *restrict, __uid_t *restrict, __uid_t *restrict)' with an expression of type '__uid_t (void)' [-Werror,-Wincompatible-pointer-types]
int (*foo)(uid_t *restrict, uid_t *restrict, uid_t *restrict) = getresuid;
      ^                                                         ~~~~~~~~~
2 errors generated.